Experimental system and method for interaction between liquid fuel high-pressure combustion flame and wall surface

Abstract

The invention discloses an experiment system and method for interaction of liquid fuel high-pressure combustion flames and a wall surface, and relates to the technical field of engines, different working conditions in an engine are simulated through a controllable combustion reaction cavity adjusted in a high-pressure range, and the collision process of the flames in an engine cylinder and the wall surface is simulated through a flat plate slit combustor. Meanwhile, an electrical automatic control device is adopted to control variable conditions in a combustion experiment, and systematic research on the flame-wall surface physical and chemical reaction process is achieved. According to the experimental system, the stability, flame structure and pollutant emission of the efficient combustion process of the engine within extremely short time can be deeply studied. Besides, the experimental device integrates and adopts the Internet of Things technology, so that the operation is simple and convenient, the experimental data is visualized, the physical and chemical action mechanism between the gas-phase flame and the solid-phase wall surface is disclosed, and important reference is provided for the improvement and the structural optimization of the efficient and clean combustion technology of the engine.

Description

Technical Field

[0001] The invention relates to the field of engine technology, and in particular to an experimental system and method for interaction between a liquid fuel high-pressure combustion flame and a wall surface. Background Art

[0002] Internal combustion engines are the main power source for road traffic, non-road mobile machinery and national defense equipment in the world today, and are one of the most important basic industries of the national economy. The interaction between flame and wall is widely present in the combustion system of internal combustion engines, which is a complex system involving the coupling of gas dynamics, thermodynamics and chemical reaction kinetics. With the advancement of the trend of engine miniaturization, the expansion and work process of high-temperature and high-pressure gas in the cylinder is accompanied by the inevitable collision between flame and wall. When the flame contacts the cooler wall in a confined space, the significant heat loss between the gas-solid interface will cause the temperature of the flame near the wall to cool rapidly, causing the combustion chemical reaction to slow down or even interrupt, resulting in flame instability or incomplete combustion. In addition, the chemical quenching effect of flame-wall is an important influencing factor in high-temperature combustion, and the adverse effects of excessive free radical extinction near the wall on fuel ignition and the generation of various combustion pollutants cannot be ignored.

[0003] In order to reduce greenhouse gas emissions, zero-carbon fuel-liquid fuel dual-fuel engines are considered to be a technology with great development potential. However, the combustion technology of zero-carbon fuel-liquid fuel dual-fuel engines still faces practical problems such as poor combustion stability, low thermal efficiency and high NOx emissions. Most existing studies focus on the impact of macroscopic physical parameters such as changing intake conditions, injection strategies and ignition active fuels on the engine's operating boundaries and combustion characteristics, while less attention is paid to the regulation of the chemical micro-reaction mechanism of the wall-combustion flame, and little attention is paid to the combustion of zero-carbon fuels under high-pressure conditions. In-depth research on the thermal-chemical coupling relationship between the flame and the wall under high-pressure conditions has important practical significance for the performance improvement and emission control of the combustion device.

[0004] At present, most flat-plate slit combustion experiments are mainly focused on gas fuels such as natural gas, while experimental research on high-pressure, easily liquefied liquid fuels still faces great challenges. In order to cope with the problem that flame behavior is difficult to observe under closed combustion conditions in the cylinder of an actual internal combustion engine, it is a feasible technical idea to use a flat-plate slit burner to independently study the interaction process between the flame and the wall, and to simulate the continuously changing actual operating pressure through a pressure-controlled combustion reaction chamber. The boundary layer of the interaction between the flame and the wall in the flat-plate slit combustion channel is mostly on the order of hundreds of microns, and traditional measurement methods often introduce greater experimental errors. Online optical diagnostic technology has demonstrated its advantages in high resolution, non-invasiveness, and high measurement accuracy in complex high-temperature combustion environments, and is a feasible means to solve the above measurement problems.

[0005] In order to explore the combustion organization mode and control strategy for improving the thermal efficiency of combustion in the engine, low NOx and unburned material emissions, the pressurized liquid fuel is heated and gasified and mixed with the oxidant, and the experimental variables such as equivalence ratio, wall temperature, pressure, flame-wall distance, etc. are controlled or the wall material is changed. The planar laser induced fluorescence test system and high-speed camera system are used to analyze the combustion free radicals formed by the wall-flame collision and the flame development process, and the flue gas analyzer is used to detect the combustion products. During the experiment, a large amount of data that needs to be recorded and processed is generated, and multiple experimental variables need to be controlled synchronously. In view of the lack of strong data collection and organization capabilities of the existing experimental platform, the Internet of Things technology is used to build a data interaction system that integrates data collection, variable control, data processing, and manual decision-making, which greatly simplifies the experimental operation process of the experimenters. Summary of the invention

[0006] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface, so as to solve the problem that the existing testing device cannot perform optical diagnosis on the interaction phenomenon between the flame and the wall surface during the high-temperature combustion of liquid fuel under varying working conditions within a high pressure range.

[0007] In order to solve the above technical problems, the present invention provides an experimental system for the interaction between a liquid fuel high-pressure combustion flame and a wall surface, comprising a pressurization module, a fuel atomization and gasification module, a pressure-controllable combustion reaction chamber, a T-shaped flat plate slot burner assembly, a distributed temperature monitoring system, an optical diagnosis system, a pressure balance emission module, a flue gas real-time analysis module and a data integration and interaction system;

[0008] The pressurizing module comprises:

[0009] A pressure supply unit connected to the pressure-controllable combustion reaction chamber through a high-pressure pipeline;

[0010] The fuel boost unit and the air boost unit are both connected to the fuel atomization and gasification module through high-pressure pipelines;

[0011] The fuel atomization and gasification module is connected to the pressure-controllable combustion reaction chamber through a heat-insulating delivery pipeline;

[0012] The T-shaped flat plate slot burner assembly is arranged in a pressure-controllable combustion reaction chamber, and is used to simulate the dynamic interaction process between the flame and the wall under the working condition of the internal combustion engine. The T-shaped flat plate slot burner assembly includes a slot burner base, a burner body, a T-shaped flat plate slot assembly and a servo-driven flat plate displacement mechanism. The burner body is wrapped with a heat-insulating material and a K-type thermocouple is inserted, which is installed and fixed under the slot burner base and connected to the fuel atomization and gasification module through a heat-insulating heating pipe. The T-shaped alloy plate is installed on a flat plate linear slide rail on the base platform. The servo-driven flat plate displacement mechanism is arranged on a steel frame platform behind the slot burner base, and a high-frequency response piezoelectric sensor is installed on the column of the steel frame platform.

[0013] The distributed temperature monitoring system collects the wall temperature of the T-shaped flat plate slot burner assembly and the thermal state parameters of the fuel delivery pipeline in real time, and transmits them to the data integration and interaction system for processing;

[0014] The optical diagnostic system collects transient image information and free radical distribution images of the flame-wall interaction process of the T-shaped plate slit assembly during high-temperature combustion, and transmits them to the data integration and interaction system for processing;

[0015] The pressure balance discharge module is arranged on the pressure controllable combustion reaction chamber to maintain the dynamic pressure balance of the pressure controllable combustion reaction chamber;

[0016] The real-time flue gas analysis module collects and analyzes the combustion products of the pressure-controlled combustion reaction chamber, and transmits the processed data signals to the data integration and interaction system;

[0017] The data integration and interaction system processes and interacts with data from sensors and devices of the pressurization module, the fuel atomization and gasification module, the distributed temperature monitoring system, the optical diagnostic system, and the flue gas real-time analysis module.

[0018] In some embodiments, the slot burner base is a frame structure, and a high-temperature refractory ceramic plate is provided on the top of the slot burner base;

[0019] The burner body includes a burner insulation body, a high-frequency ignition unit and a burner nozzle. The burner insulation body is fixedly installed below the slit burner base. The burner insulation body includes insulation material, an electric heating wire and a burner K-type thermocouple. The combustion chamber inside the burner insulation body is connected to the air inlet end of the premixed fuel gas delivery pipeline. The burner K-type thermocouple is arranged on both sides of the burner insulation body to monitor the fuel temperature to judge the gasification condition. The burner nozzle is arranged above the burner insulation body. A burner nozzle is arranged on the top of the burner nozzle. The channel of the burner nozzle is a rectangular structure. The top surface of the burner nozzle is flush with the surface of the high-temperature refractory ceramic plate. The high-frequency ignition unit is arranged on the side of the burner nozzle.

[0020] A stepping servo motor for driving the left and right screw rods of the servo-driven plate displacement mechanism to rotate is provided on one side of the servo-driven plate displacement mechanism, a mobile platform is movably installed on the servo-driven plate displacement mechanism, and a displacement sensor is installed on the servo-driven plate displacement mechanism to monitor the distance between the plates;

[0021] The T-shaped flat plate slit assembly includes a carbon silicon electric heating rod, a high-transmittance quartz plate, two parallel T-shaped alloy plates with surface nitriding treatment, a flat plate K-type thermocouple and a flat plate linear slide; the carbon silicon electric heating rod is vertically arranged in the T-shaped alloy plate, a temperature measuring hole is opened on the side of the T-shaped alloy plate, the flat plate K-type thermocouple is arranged in the temperature measuring hole, the two T-shaped alloy plates are respectively fixed on the two moving platforms of the servo-driven flat plate displacement mechanism, the two T-shaped alloy plates are placed parallel and symmetrically, the high-transmittance quartz plate is fixed above the slit burner base, the two T-shaped alloy plates and the two high-transmittance quartz plates constitute a visible combustion channel, the flat plate linear slide is fixedly installed on the top of the slit burner base, and the T-shaped alloy plate is movably installed on the flat plate linear slide.

[0022] In some embodiments, the pressure supply unit of the pressurizing module includes an air compressor and an air storage tank; the fuel pressurizing unit of the pressurizing module includes a liquid fuel storage tank and a fuel pressurizing pump; the air pressurizing unit of the pressurizing module includes an air high-pressure storage tank and an air pressurizing pump;

[0023] The output end of the air compressor is connected to the input end of the air storage tank through a pipeline, the output end of the air storage tank is connected to the pressure-controlled combustion reaction chamber through a pipeline, the output end of the liquid fuel storage tank is connected to the input end of the fuel booster pump through a pipeline, and the output end of the air high-pressure storage tank is connected to the input end of the air booster pump through a pipeline;

[0024] The fuel atomization and gasification module comprises:

[0025] A fuel pretreatment unit, including a PID electronically controlled fuel gasification electric heater and a constant flow pump;

[0026] An equivalence ratio precision control unit includes a first mass flow controller, a second mass flow controller and a fuel premixing tank;

[0027] The output end of the fuel boost pump is connected to the constant flow pump, the PID electronically controlled fuel gasification electric heater, and the first mass flow controller in sequence through a pipeline. The output end of the air boost pump is connected to the input end of the second mass flow controller through a pipeline. The output ends of the first mass flow controller and the second mass flow controller are both connected to the input end of the fuel premixing tank through a pipeline. The output end of the fuel premixing tank is connected to the pressure-controllable combustion reaction chamber through an insulated delivery pipeline after passing through an anti-backfire one-way valve.

[0028] In some embodiments, the pressure-controlled combustion reaction chamber includes a cylinder made of high-strength pressure-resistant steel, and the cylinder is provided with three-way orthogonal observation windows, and the three-way orthogonal observation windows include a front observation window, a back observation window and a top observation window, and the front observation window, the back observation window and the top observation window are respectively arranged on the front and rear sides and the top of the cylinder, and the top of the cylinder is provided with a reaction chamber pressure gauge and an explosion-proof safety air valve, and the sides of the cylinder are respectively provided with a reaction chamber pressure supply pipe, an exhaust pipe and a flue gas collection and delivery pipe, and the reaction chamber pressure supply pipe is connected to the third solenoid valve and then connected to the output end of the air storage tank, and the lower part of the cylinder is provided with a premixed fuel gas delivery pipe and a cabin penetration part for a power supply and signal control line channel, and the premixed fuel gas delivery pipe is connected to the fuel premixing tank, and the pipeline surface of the premixed fuel gas delivery pipe is wrapped with a pipeline insulation heating belt.

[0029] In some embodiments, the optical diagnostic system comprises:

[0030] The ICCD camera is set just behind the rear observation window to achieve ns-level time-resolved imaging;

[0031] A tunable light source system includes a Nd:YAG laser generator and a dye laser. The Nd:YAG laser generator can excite a pulsating laser of a set wavelength, and the pulsating laser is introduced into the dye laser to generate a dye laser of a specific wavelength required for the experiment.

[0032] The planar laser induced fluorescence system comprises a sheet light forming component and a high reflectivity optical lens group. The dye laser passes through the sheet light forming component and is then refracted into a combustion channel by the high reflectivity optical lens group.

[0033] In some embodiments, the real-time flue gas analysis module includes an online flue gas analyzer, a smoke collection and delivery pipe, a smoke collection module, a smoke collection mobile module, a guide rail, a smoke collection telescopic spring tube and a T-shaped ceramic smoke collection pipe. The T-shaped ceramic smoke collection pipe is arranged on the side of the smoke collection module, the smoke collection telescopic spring tube is connected to the smoke collection module, the smoke collection module is fixed to the smoke collection mobile modules at both ends through a cross beam, the two ends of the guide rail are fixedly installed on the pressure-controllable combustion reaction chamber, the smoke collection mobile module is movably installed on the guide rail, the air inlet of the smoke collection and delivery pipe is connected to the air outlet of the smoke collection telescopic spring tube, and the smoke collection and delivery pipe is connected to the online flue gas analyzer after connecting the first solenoid valve.

[0034] In some embodiments, the pressure-balanced discharge module includes a pressure reducing valve installed at the air outlet of the exhaust pipe. A second solenoid valve is also installed on the exhaust pipe. When the pressure of the pressure-controlled combustion reaction chamber exceeds a threshold, the second solenoid valve opens to release pressure.

[0035] In some embodiments, the distributed temperature monitoring system includes:

[0036] A temperature controller is electrically connected to the carbon silicon electric heating rod to achieve temperature control of the carbon silicon electric heating rod;

[0037] The multi-channel temperature acquisition instrument is electrically connected to the flat plate K-type thermocouple and the burner K-type thermocouple to achieve synchronous acquisition of temperature signals;

[0038] Infrared thermal imager, assists in verifying the surface temperature field distribution.

[0039] In some embodiments, the data integration and interaction system includes:

[0040] Multi-channel data acquisition module, which transmits data with various devices and sensors through RS485 to TTL module;

[0041] The PC computer,control system is connected to the multi-channel data acquisition module via USB to TTL.

[0042] The present invention also provides an experimental method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface, which specifically comprises the following steps:

[0043] S1: Install the target experimental material plate on the T-shaped alloy plate; adjust the distance between the plates: control the movement of the mobile platform through the stepping servo motor, and monitor the distance between the plates with the displacement sensor. After adjusting the distance between the plates, start the temperature controller to heat the plate with the carbon silicon electric heating rod, connect the power supply of the pipeline insulation heating belt to preheat the entire pipeline, and at the same time, start the air compressor to continuously compress the air and store it in the air storage tank. After compressing enough air, open the third solenoid valve to pressurize the pressure-controlled combustion reaction chamber, and monitor the pressure of the device until the pressure value required for the experiment is reached;

[0044] S2: Real-time monitoring of the combustion chamber pressure and wall temperature, as well as the preheating of the fuel delivery pipeline, through high-frequency response piezoelectric sensors, flat-plate K-type thermocouple arrays and burner K-type thermocouples until the experimental preset conditions are met;

[0045] S3: The fuel booster pump and the air booster pump respectively pressurize the liquid fuel and air in the liquid fuel storage tank and the air high-pressure storage tank to the pressure required for the experiment; after the liquid fuel is pressurized to the pressure required for the experiment, it passes through a delivery pipeline with a fuel pressure gauge and a constant flow pump to control the volume flow rate, and the output constant flow liquid fuel enters the electronically controlled fuel gasification electric heater for heating and full gasification, and the liquid fuel enters the first mass flow controller through the heat-insulating delivery pipeline after gasification; after the air is pressurized to the pressure required for the experiment, it enters the second mass flow controller through a delivery pipeline with an air pressure gauge; the constant flow pump and the mass flow meter realize precise control of the equivalence ratio; it enters the fuel premixing tank to realize full mixing of fuel / air, and the premixed gas fuel is delivered to the burner body and ejected from the burner nozzle in the combustion channel, and the fuel premixed gas is ignited by the high-frequency ignition unit at the same time;

[0046] S4: Open the second solenoid valve and observe whether the pressure in the combustion chamber fluctuates. After the state stabilizes and reaches the experimental standard, high-speed photography is used to synchronously record the flame development process, the planar laser induced fluorescence system captures the two-dimensional distribution of free radicals, and the distributed temperature monitoring system records the process temperature.

[0047] S5: After completing the optical experimental data collection, start the flue gas collection mobile module to move to the center of the adjustable spacing T-shaped plate slit, extend the T-shaped ceramic flue gas collection tube into the combustion chamber to collect the combustion product gas, and transport it to the external online flue gas analyzer for combustion product analysis, and finally discharge it to the outside;

[0048] S6: Data processing, the multi-channel data acquisition module acquires the raw data, transmits it to the PC to generate data packets, and performs data visualization.

[0049] Compared with the related art, the experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall provided by the present invention have the following beneficial effects:

[0050] The present invention provides an experimental system and method for the interaction between a high-pressure combustion flame of a liquid fuel and a wall surface. The system simulates different working conditions inside an engine through a controllable combustion reaction chamber adjusted within a high-pressure range, and simulates the collision process between the flame and the wall surface in the engine cylinder through a flat-plate slit burner. At the same time, an electrical control device is used to control the variable conditions in the combustion experiment, so as to achieve a comprehensive and detailed study of the flame-wall physical and chemical reaction process. An air compressor and a compressed air storage tank can maintain the experimental condition pressure, a mass flow meter controls the equivalence ratio, a T-shaped alloy plate is inserted into a carbon-silicon electric heating rod to control the wall temperature, and a mobile platform controlled by a stepping servo motor controls the plate spacing and thus controls the contact distance between the flame and the wall surface. The matching optical diagnostic system and distributed temperature monitoring system can more intuitively reflect the tiny variables and change laws in the process of interaction between the flame and the wall surface from the aspects of images and data. Therefore, the experimental system provided by the present invention can simulate and realize in-depth research on the stability, flame structure and pollutant emissions of the efficient combustion process in the engine in a very short time. The experimental device adopts the Internet of Things technology, which is easy to operate and can visualize the experimental data, revealing the physical and chemical action mechanism between the gas phase flame and the solid phase wall, and providing corresponding reference for the improvement of the engine's efficient and clean combustion technology and structural optimization.

[0051] The present invention provides an experimental system and method for the interaction between a liquid fuel high pressure combustion flame and a wall surface. The K-type thermocouple probes of a distributed temperature monitoring system are evenly installed inside a flat plate to obtain the instantaneous temperature change of the wall surface and the heat flux of the wall surface.

[0052] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface. By arranging a smoke collection telescopic spring tube in a combustion chamber and a T-shaped ceramic smoke collection tube controlled by a mobile module, the position of the smoke collection port can be accurately adjusted to collect the smoke of combustion products for analysis.

[0053] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface. By setting an electrically controlled stepping servo motor to control the movement of a slit plate and changing the collision distance between the flame and the wall surface during combustion, simulations of different collision situations between the flame and the wall surface can be obtained simultaneously.

[0054] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface. By setting up a laser fluorescence induction device and using a specific laser to excite the luminescence of free radicals generated in the combustion flame, the flame-wall interaction process can be non-invasively measured.

[0055] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface. A thin steel sheet with countersunk nuts on all sides is designed on the flame contact surface of a flat plate. After the nuts are tightened, the thin steel sheet fits tightly on the flat plate. The wall surfaces with different roughness and materials can be detachably replaced or the wall surface coating can be performed. This broadens the application scope of the experimental system and simulates the influence of the physical and chemical properties of the wall material on the combustion process under high-pressure conditions.

[0056] The present invention provides an experimental system and method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface. By using a data integration and interaction system, the sensor data is processed and visualized while the experimental equipment is synchronously controlled, and the original data is stored in an open source database, which greatly simplifies the operation of the entire experimental system. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is an overall schematic diagram provided for this embodiment.

[0058] Figure 2 for Figure 1 The appearance structure diagram of the pressure-controlled combustion reaction chamber is shown.

[0059] Figure 3 for Figure 1 The structure cross-sectional view of the T-shaped flat plate slot burner of the pressure-controlled combustion reaction chamber is shown.

[0060] Figure 4 This is a structural diagram of the T-shaped flat plate slot burner provided in this embodiment.

[0061] Figure 5 This is a working principle diagram of the data integration and interaction system provided in this embodiment.

[0062] Numbers in the figure: 1. Pressure-controlled combustion reaction chamber; 2. Online flue gas analyzer; 301. First solenoid valve; 302. Second solenoid valve; 303. Third solenoid valve; 4. Pressure reducing valve; 5. ICCD camera; 6. Sheet light shaping assembly; 7. Air storage tank; 8. Dye laser; 9. Nd:YAG laser generator; 10. Air compressor; 11. Electric heater for electric fuel vaporization; 12. Constant flow pump; 131. Fuel pressure gauge; 132. Air pressure gauge; 14. Fuel booster pump; 15. Liquid Fuel storage tank; 16, air high pressure storage tank; 17, air booster pump; 181, first mass flow controller; 182, second mass flow controller; 19, fuel premix tank; 20, one-way valve; 21, multi-channel data acquisition module; 22, temperature controller; 23, PC computer; 24, multi-channel temperature acquisition instrument; 25, T-type flat plate slit burner assembly; 26, top observation window; 27, reaction chamber pressure gauge; 28, cylinder; 29, reaction chamber pressure supply pipeline; 30, front observation window ; 31. Premixed fuel gas delivery pipeline; 32. Cabin penetration; 33. Exhaust pipeline; 34. Smoke collection and delivery pipe; 35. Back observation window; 36. Explosion-proof safety valve; 37. High reflectivity optical lens group; 38. Smoke collection module; 39. Smoke collection mobile module; 40. Guide rail; 41. Slit burner base; 42. Burner body; 43. T-type flat plate slit assembly; 44. Servo-driven flat plate displacement mechanism; 45. Carbon silicon electric heating rod; 46. High transmittance quartz plate; 47. T-type Gold plate; 48. High-frequency ignition unit; 49. High-temperature refractory ceramic plate; 50. Burner K-type thermocouple; 51. Burner insulation; 52. Pipeline insulation heating belt; 53. Burner nozzle; 54. Power supply and signal control circuit; 55. Burner nozzle; 56. Flat linear slide; 57. High-frequency response piezoelectric sensor; 58. Flat K-type thermocouple; 59. Stepper servo motor; 60. Displacement sensor; 61. Mobile platform; 62. Smoke collection telescopic spring tube; 63. T-type ceramic smoke collection tube. DETAILED DESCRIPTION

[0063] In the experimental system and method for the interaction between a high-pressure combustion flame of a liquid fuel and a wall provided in an embodiment of the present invention, a pressure-controllable combustion reaction chamber is used to simulate the internal working conditions of an engine under high pressure, an electrically controlled servo-driven flat plate displacement mechanism is used to change the collision distance between the flame and the plate, a mass flow controller controls the equivalence ratio, an electric heating device controls the temperature, a replaceable wall fixing material, and a flue gas analyzer analyzes the combustion products, thereby simulating the microscopic variables and change laws in the process of interaction between the flame and the wall, and realizing the study of the physical and chemical mechanisms of the flame-wall combustion process.

[0064] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0065] Embodiment 1

[0066] This embodiment provides an experimental system for the interaction between a liquid fuel high pressure combustion flame and a wall surface. Figures 1 to 4 As shown, it includes a pressurizing module, a fuel atomization and gasification module, a pressure-controlled combustion reaction chamber 1, a T-shaped flat plate slit burner assembly 25, a distributed temperature monitoring system, an optical diagnostic system, a pressure balance emission module, a flue gas real-time analysis module and a data integration and interaction system; the pressurizing module is respectively connected to the pressure-controlled combustion reaction chamber 1 and the fuel atomization and gasification module, and the fuel atomization and gasification module is connected to the pressure-controlled combustion reaction chamber 1; the T-shaped flat plate slit burner assembly 25 is arranged in the pressure-controlled combustion reaction chamber 1 to simulate the collision process between the internal flame of the engine and the wall; the distributed temperature monitoring system collects the wall temperature of the T-shaped flat plate slit burner assembly 25 and the preheating of the fuel delivery pipeline in real time The optical diagnostic system collects image information of the flame-wall interaction process of the T-type flat slot burner assembly 25 during high-temperature combustion, and transmits the processed data signal to the pressure balance emission module of the data integration and interaction system to ensure pressure stability during the experiment. The flue gas real-time analysis module collects and analyzes the combustion products of the pressure-controlled combustion reaction chamber 1, and transmits the processed data signal to the data integration and interaction system. The data integration and interaction system processes and interacts with the data from the sensors and equipment of the pressurization module, the fuel atomization and gasification module, the distributed temperature monitoring system, the optical diagnostic system and the flue gas real-time analysis module.

[0067] In this embodiment, under the control of the data integration and interaction system, liquid fuel and air are converted into gaseous fuel required for the experiment through the pressurization module and the fuel atomization and gasification module, and transported to the T-shaped flat plate slot burner assembly 25 to ignite and simulate the collision process between the flame inside the engine and the wall; the pressure-controllable combustion reaction chamber 1, the pressurization module, the pressure balance exhaust module, and the distributed temperature monitoring system are used to ensure the controllability of the experimental conditions; the image information of the interaction process between the flame and the wall in high-temperature combustion is collected through the optical diagnostic system; the flue gas real-time analysis module collects and analyzes the combustion products; this system provides experimental personnel with visualized experimental data, reveals the physical and chemical action mechanism between the gas phase flame and the solid phase wall, and provides corresponding references for the improvement of efficient and clean combustion technology and structural optimization of the engine.

[0068] Embodiment 2

[0069] On the basis of the first embodiment, the T-shaped flat plate slot burner assembly 25 of this embodiment includes a slot burner base 41, a burner body 42, a T-shaped flat plate slot assembly 43, and a servo-driven flat plate displacement mechanism 44. The slot burner base 41 includes a steel platform to form a frame structure, and the top is a high-temperature refractory ceramic plate 49 to prevent interference caused by the bottom air suction; the burner body 42 is installed below the slot burner base 41, the T-shaped flat plate slot assembly 43 is installed on the flat plate linear slide rail 56 of the slot burner base 41, and the servo-driven flat plate displacement mechanism 44 is installed on the steel frame platform behind the slot burner base 41.

[0070] The burner body 42 includes a burner insulation body 51, a high-frequency ignition unit 48 and a burner nozzle 53. The burner insulation body 51 is composed of insulation material, electric heating wire and burner K-type thermocouple 50. The burner is connected to the premixed fuel gas delivery pipeline 31; the burner K-type thermocouple 50 is arranged on both sides of the burner insulation body 51; the burner nozzle 53 is above the burner insulation body 51, and the channel of the burner nozzle 55 is a rectangular structure with a length of 15 mm and a width of 1 mm. The top surface of the burner nozzle 55 is in contact with the surface of the high-temperature refractory ceramic plate 49. flush; the high-frequency ignition unit 48 is arranged on the side of the burner nozzle 55, and is connected to the external multi-channel data acquisition module 21 through the bottom line through-chamber part 32, and the PC computer 23 is used to control the high-frequency ignition unit 48 to generate electric spark ignition; the fuel gas after heating, gasification and premixing enters the burner insulation body 51 after passing through the premixed fuel gas delivery pipeline 31, and finally is ejected from the burner nozzle 55 at the top of the burner nozzle 53, and is ignited by the high-frequency ignition unit 48 to generate a flame parallel to the T-shaped alloy plate 47.

[0071] A stepper servo motor 59 for driving the screw to rotate is installed on one side of the servo-driven plate displacement mechanism 44. A moving platform 61 and a displacement sensor 60 are installed on the servo-driven plate displacement mechanism 44, which is convenient for reading the distance data between the plates directly on the PC; when the stepper servo motor 59 drives the left and right screws to rotate, the two moving platforms 61 can be simultaneously displaced toward the center, thereby adjusting the slit distance between the plates, and the adjustment accuracy is ±0.01mm, while the flameout distance scale of a general flame is much larger than this accuracy, meeting the accuracy requirements of the experiment; the T-shaped structure of the T-shaped alloy plate 47 increases the heat storage capacity of the plate, which is beneficial to reducing the fluctuation of the wall temperature and reserving a stroke for the adjustment of the slit spacing, and thermal insulation cotton can be laid on the outside of the T-shaped alloy plate 47 to insulate the plate and reduce heat dissipation losses in the experiment.

[0072] The T-shaped flat plate slit assembly 43 includes a carbon silicon electric heating rod 45, a high-transmittance quartz plate 46, a T-shaped alloy flat plate 47, a flat plate K-type thermocouple 58 and a flat plate linear slide 56; the carbon silicon electric heating rod 45 is vertically inserted into the T-shaped alloy flat plate 47, and a temperature measuring hole is opened on the side of the T-shaped alloy flat plate 47 to install the flat plate K-type thermocouple 58, which is used to measure the temperature change and heat flux of the wall and the near-wall area during the interaction between the flame and the wall; the two parallel and symmetrically placed T-shaped alloy flat plates 47 are fixed on the servo-driven flat plate by positioning screws. On the two moving platforms 61 of the plate displacement mechanism 44, two high-transmittance quartz plates 46 clamp the T-shaped alloy flat plate 47 to form a slit combustion channel; the flat linear slide rail 56 is fixedly installed on the slit burner base 41 and docked with the T-shaped alloy flat plate 47. Reducing the weight of the flat plate will increase the resistance to movement; the flat wall of the T-shaped alloy flat plate 47 is a replaceable wall design, and the rectangular thin steel sheet is fixed to the wall by the countersunk nuts at the four corners, so that experiments on the interaction process between different wall coatings or different wall materials and flames can be carried out.

[0073] Embodiment 3

[0074] On the basis of Example 1, the pressurization module of this embodiment includes an air compressor 10, an air storage tank 7, a liquid fuel storage tank 15, a fuel boost pump 14, an air high-pressure storage tank 16 and an air boost pump 17. The air compressor 10 compresses the air and stores it in the air storage tank 7. The fuel boost pump 14 and the air boost pump 17 respectively pressurize the liquid fuel and air in the liquid fuel storage tank 15 and the air high-pressure storage tank 16 to the pressure required for the experiment.

[0075] Embodiment 4

[0076] On the basis of the third embodiment, the fuel atomization and gasification module of this embodiment includes a constant flow pump 12, an electrically controlled fuel gasification electric heater 11, a first mass flow controller 181, a second mass flow controller 182 and a fuel premixing tank 19. After the liquid fuel is pressurized to the pressure required for the experiment, it passes through the delivery pipeline equipped with a fuel pressure gauge 131 and the constant flow liquid fuel outputted by the constant flow pump 12 enters the electrically controlled fuel gasification electric heater 11, where it is heated and fully gasified. After that, all pipelines are insulated pipelines wrapped with insulation materials and wrapped with pipeline insulation heating belts 52 to prevent cooling during the delivery of the gasified fuel. but liquefied, and then passed through the first mass flow controller 181; the air was pressurized to the pressure required for the experiment and entered the second mass flow controller 182 through a stainless steel delivery pipe equipped with an air pressure gauge 132; the output ends of the first mass flow controller 181 and the second mass flow controller 182 were both connected to the fuel premixing tank 19, and the control signals and data of the mass flow controllers were transmitted to the multi-channel data acquisition module 21, which controlled the mass flow rates of the fuel and air to ensure that the equivalence ratio of the experiment was controllable; a one-way valve 20 was installed on the insulation delivery pipeline after the fuel premixing tank 19 and connected to the burner input end.

[0077] Embodiment 5

[0078] On the basis of the fourth embodiment, the pressure-controlled combustion reaction chamber 1 of this embodiment includes a cylinder 28, which is used to provide the specific pressure and environment required for the experiment. The combustion reaction chamber body is composed of a special stainless steel cylinder that can withstand high pressure. Since fuel is continuously charged and burned during the experiment, this will inevitably lead to pressure fluctuations in the entire pressure-controlled combustion reaction chamber 1, causing changes in experimental conditions. In order to avoid this problem, on the one hand, the burner flow rate used is very small, and on the other hand, a larger combustion chamber size is selected to dilute the pressure fluctuations that may occur during the experiment; the bottom of the combustion chamber is an integrated structure, and a premixed fuel gas delivery pipeline 31 is welded at the bottom. In addition, power supplies and signal control lines 54 such as thermocouples, servo motors, and sensors are connected to external equipment through the cabin penetration member 32, and a sealed treatment is adopted. The cylinder 28 is provided with a front observation window 30, a back observation window 35 and a top observation window 26 respectively provided with flanges on the front and rear sides and the top. The observation window made of tempered glass is provided in the middle of the flange, which is convenient for observing the interaction process between the flame and the T-shaped alloy plate 47 under the high-temperature combustion of the experimental fuel. At the same time, the top observation window 26 is also used for the injection of the pulse laser of the Nd:YAG laser generator 9. A reaction chamber pressure gauge 27 and an explosion-proof safety valve 36 are installed on the top of the cylinder 28. The range of the reaction chamber pressure gauge 27 is -0.1 to 25 MPa. At present, the actual maximum combustion pressure of the combustion chamber of diesel engines at home and abroad is usually between 6 MPa and 15 MPa, and the supercharged diesel engine generally reaches more than 13 MPa, which can meet the experimental needs. The reaction chamber pressure gauge 27 allows the experimenter to directly observe the physical environment of the air pressure in the cylinder 28; the explosion-proof safety valve 36 can discharge gas when the pressure in the cylinder 28 is too high, thereby improving the safety of the experiment; the reaction chamber pressure supply pipeline 29, the exhaust pipeline 33 and the flue gas collection and delivery pipe 34 are welded on the sides of the cylinder 28 respectively, and the air enters the cylinder 28 through the reaction chamber pressure supply pipeline 29 equipped with the third solenoid valve 303 after being output from the air storage tank 7. The lower part of the cylinder 28 is provided with a premixed fuel gas delivery pipeline 31 and a cabin penetration component 32 used as a power supply and signal control line 54 channel; the pipeline surface of the premixed fuel gas delivery pipeline 31 is wrapped with a pipeline insulation heating belt 52.

[0079] Embodiment 6

[0080] On the basis of the fifth embodiment, a high-frequency response piezoelectric sensor 57 is further installed on the column of the servo-driven flat plate displacement mechanism 44 of this embodiment; the high-frequency response piezoelectric sensor 57 is connected to the data integration and interaction system through the multi-channel data acquisition module 21, and monitors the pressure in the pressure-controlled combustion reaction chamber 1 in real time. When the compressed air in the air storage tank 7 is introduced into the pressure-controlled combustion reaction chamber 1 until the pressure value required for the experiment is reached, the heating devices of various parts are started at the same time, and liquid fuel-air is introduced after reaching the preset temperature. The vaporized premixed gas is ejected from the burner nozzle 53 between the slits, and the high-frequency ignition unit 48 is used to ignite the fuel premixed gas. This experimental system has two sets of detection equipment, which need to be conducted separately during operation. For the optical diagnostic system of flame morphology and the process of interaction with the wall: open the pressure balance discharge module, the PID solenoid valve continuously releases pressure, and observe the pressure signal of the reaction chamber pressure gauge 27 or the high-frequency response piezoelectric sensor 57 at the top of the pressure-controlled combustion reaction chamber 1 again. Adjust the chamber pressure by adjusting the power of the air compressor 10 and the solenoid valve. After the state is stable, use the optical diagnostic system and the distributed temperature monitoring system to record the interaction between the flame and the wall. For the flue gas analysis system of combustion products: close the pressure balance discharge module, use the flue gas collection mobile module 39 to extend the special T-shaped ceramic flue gas collection tube 63 into different positions of the slit to collect flue gas, and pass it into the external online flue gas analyzer 2 for analysis of combustion products.

[0081] Embodiment 7

[0082] On the basis of the sixth embodiment, the optical diagnostic system of this embodiment includes an ICCD camera 5 and an OH-PLIF planar laser induced fluorescence system; the OH-PLIF planar laser induced fluorescence system includes an Nd:YAG laser generator 9, a dye laser 8, a sheet light forming component 6, and a high reflectivity optical lens group 37. The Nd:YAG laser generator 9 can excite a pulsating laser of a set wavelength, introduce the pulsating laser into the dye laser 8 to generate a dye laser of a specific wavelength required for the experiment, and the dye laser is converted into a sheet light of about 1.5 mm thickness after passing through the sheet light forming component 6. The sheet light forming component 6 is used to adjust the laser irradiation width and focal length (divergence and convergence), and then the high reflectivity optical lens group 37 is used to vertically cut the sheet light to the slit, and the ICCD camera 5 with an intensifier placed horizontally is used to observe the back observation window 35 on the back of the pressure-controlled combustion reaction chamber 1, and the combustion flame process morphology of the interaction between the flame and the wall surface is photographed, and the free radical fluorescence signal can also be captured, and the intensity distribution of the fluorescence signal in the flame is recorded, so as to characterize the concentration of gas-phase OH free radicals. The lens of the ICCD camera 5 used is a UV lens with a bandwidth filter, which can filter out interference from factors such as flame self-luminescence, scattered / reflected light of the same frequency as the laser, and miscellaneous light sources in the experimental environment. At the same time, in order to obtain a larger magnification, a bellows is installed in front of the lens.

[0083] Embodiment 8

[0084] On the basis of the sixth embodiment, the real-time flue gas analysis module of this embodiment includes an online flue gas analyzer 2, a flue gas collection and delivery pipe 34, a flue gas collection module 38, a flue gas collection mobile module 39, a guide rail 40, a flue gas collection telescopic spring tube 62 and a T-shaped ceramic flue gas collection tube 63, wherein the T-shaped ceramic flue gas collection tube 63 is fixed on the flue gas collection module 38, and the flue gas collection telescopic spring tube 62 is connected to the T-shaped ceramic flue gas collection tube 63 through the flue gas collection module 38; both ends of the slide rail of the flue gas collection module 38 are installed on the flue gas collection mobile module 39, and both ends of the guide rail 40 are fixedly installed on the pressure-controlled combustion reaction chamber 1; the flue gas collection telescopic spring tube 62 is connected to the flue gas collection and delivery pipe 34, and the flue gas collection and delivery pipe 34 is connected to the online flue gas analyzer 2 after passing through the first solenoid valve 301. This module also includes an alarm to detect the concentration of combustible gas in the air and alarm when it exceeds the limit to prevent explosion accidents. The measurement range of the online flue gas analyzer 2 is 0 to 2000 ppm. It analyzes the combustion product information and transmits the data signal to the data integration and interaction system computer to generate two-dimensional coordinate system images such as temperature-product concentration and slit spacing-product concentration.

[0085] Embodiment 9

[0086] On the basis of the fifth embodiment, the second solenoid valve 302 and the pressure reducing valve 4 are further installed on the exhaust pipe 33 of the pressure balance exhaust module of this embodiment; under normal working conditions, the smoke will be automatically discharged under the pressurized test conditions. The exhaust and smoke analysis pipes are designed independently and do not interfere with each other.

[0087] Embodiment 10

[0088] Based on the second embodiment, the distributed temperature monitoring system of this embodiment includes a temperature controller 22 and a multi-channel temperature collector 24; the temperature controller 22 is electrically connected to the carbon silicon electric heating rod 45; the multi-channel temperature collector 24 is electrically connected to the flat plate K-type thermocouple 58 and the burner K-type thermocouple 50. The T-shaped alloy plate 47 is provided with holes for inserting the carbon silicon electric heating rod 45 for heating the wall surface; the outer side of the T-shaped alloy plate 47 is evenly provided with temperature measuring holes for inserting the burner K-type thermocouple 50, and the depth of the temperature measuring hole is 2 mm from the combustion surface; the multi-channel temperature acquisition instrument 24 acquires the temperature signal of the flat plate K-type thermocouple 58, and then transmits the temperature data signal to the multi-channel data acquisition module 21, and transmits the processed signal to the PC computer 23 for storage and visualization; after obtaining the temperature data, the experimenter sends a control instruction to the temperature controller 22 through manual decision-making according to the experimental conditions, adjusts the electric heating power of the carbon silicon electric heating rod 45, and realizes the controllable wall temperature; a burner K-type thermocouple 50 is also arranged on the burner insulation body 51 to monitor the fuel temperature, determine whether the gasified fuel is liquefied, and the data integration and interaction system controls the heating power of the fuel atomization and gasification module.

[0089] In the experiment, the multi-channel temperature acquisition instrument 24 collects the temperature data of the flat plate K-type thermocouple 58, and then transmits it to the multi-channel data acquisition module 21 and the PC computer 23 to generate available data and generate an image of the wall temperature in a two-dimensional coordinate system. Then, the PC computer 23 is used for manual decision processing to send a control command to the temperature controller 22, so as to adjust the power of the carbon silicon electric heating rod 45 in time to realize the monitoring and control of the wall temperature; the purpose of heating and controlling the wall surface is that the high-temperature wall surface has a flame stabilizing effect on the flame, and the flame is finally stabilized at different positions in the channel by changing the premixed gas flow rate, equivalence ratio, pressure, initial temperature, etc.; on the other hand, the temperature field and thermal boundary field of the initial state are fixed, which is convenient for controlling the experimental variables. In addition, in order to achieve more stable control of the wall temperature, a clamping insulation cotton is used on the outside of the flat plate to reduce heat loss. The lines of the carbon silicon electric heating rod 45 and the flat plate K-type thermocouple 58 are connected to external equipment and systems through the through-cabin 32 at the bottom of the combustion chamber. Because the liquid fuel used in the experiment is vaporized by heating the wall and then cooled and liquefied again during transportation, the entire pipeline is wrapped with insulation materials and electric heating wires, and K-type thermocouples are arranged every 30 cm to monitor the temperature inside the pipe.

[0090] Embodiment 11

[0091] On the basis of the first to tenth embodiments, the data integration and interaction system of this embodiment includes a multi-channel data acquisition module 21 based on FPGA, a PC computer 23, various sensors, hardware devices, connection lines and software parts. The multi-channel data acquisition module 21 is connected to the high-frequency response piezoelectric sensor 57, the first mass flow controller 181, the second mass flow controller 182, the displacement sensor 60, the stepping servo motor 59, the high-frequency ignition unit 48, the electromagnetic valve, the temperature controller 22, the multi-channel temperature acquisition instrument 24, the online flue gas analyzer 2, the electric fuel gasification electric heater 11, and the flue gas collection mobile module 39 through the RS485 to TTL module; the PC computer 23 is connected to the multi-channel data acquisition module 21 through the USB to TTL module, which is used to collect and process experimental data and control the working state of each component in real time to achieve the purpose of controlling variables, so as to realize the collision process between the flame and the wall inside the engine by a single variable simulation. The PC computer 23 can be used to conveniently and simply manipulate multiple experimental variables, and conduct a comprehensive and detailed study of the interaction process between the flame and the wall. At the same time, the data visualization processing used allows the data collected by the optical diagnostic system, distributed temperature monitoring system, high-frequency response piezoelectric sensor 57, mass flow controller 182, etc. to be directly generated into a two-dimensional coordinate system image on the PC computer 23, which can intuitively reflect the microscopic variables and change laws in the interaction process between the flame and the wall from the data aspect. The measured data can provide corresponding reference for the improvement of the engine's efficient and clean combustion technology and structural optimization.

[0092] like Figure 5As shown, the working principle of the data integration and interaction system includes: the multi-channel data acquisition module 21 uses the RS485 to TTL module to communicate with the sensor and control equipment in a two-way manner, and uses the USB to TTL module to communicate with the PC computer 23 in a two-way manner; the multi-channel data acquisition module 21 continuously sends read instructions to the sensor and equipment through the communication protocol to obtain the original data and perform function conversion processing, etc., to generate twin data that can be directly read by the PC, and upload the twin data to the EMQX server through WIFI communication technology. EMQX is an open source distributed Internet of Things message server; a MySQL database is established, and the program development tool PyCharm is used to subscribe to the EMQX server to continuously obtain a large amount of sensor data and control parameters in the server, and further use ORM programming technology to store the data in the MySQL database, which is convenient for the experimenter to search later. The experimental acquisition data received on the PC computer 23 uses Echart to create interactive data visualization charts on the web page, and the data is converted into line charts, bar charts and numbers for dynamic display, so that the operation status of the entire experimental system can be intuitively grasped. On the PC computer 23, the experimenter refers to the visualized data image and, based on the specific experimental requirements, manually decides to send control commands to the multi-channel data acquisition module 21, and then synchronously controls each device.

[0093] The present invention provides an experimental method for the interaction between a liquid fuel high-pressure combustion flame and a wall surface, which specifically comprises the following steps:

[0094] S1: Adjust the distance between the T-shaped alloy plates 47, control the movement of the mobile platform 61 through the step servo motor 59, monitor the distance between the plates through the displacement sensor 60, start the carbon silicon electric heating rod 45 to heat the plate after adjusting the distance between the plates, connect the power of the pipeline insulation heating belt 52 to preheat the entire pipeline, and at the same time, start the air compressor 10 to continuously compress the air and store it in the compressed air storage tank 7. After compressing a sufficient amount of air, open the third solenoid valve 303 to pressurize the pressure-controlled combustion reaction chamber 1.

[0095] S2: The compressed air in the air storage tank 7 is introduced into the pressure-controlled combustion reaction chamber 1 until the pressure value required for the experiment is reached, and the pressure of the device is monitored.

[0096] S3: The combustion chamber pressure and wall temperature, as well as the preheating condition of the fuel delivery pipeline are monitored in real time through the high-frequency response piezoelectric sensor 57, the flat plate K-type thermocouple 58 and the burner K-type thermocouple 50 until the experimental preset conditions are reached.

[0097] S4: The fuel booster pump 14 and the air booster pump 17 respectively pressurize the liquid fuel and air in the liquid fuel storage tank 15 and the air high-pressure storage tank 16 to the pressure required for the experiment; after the liquid fuel is pressurized to the pressure required for the experiment, it passes through the delivery pipeline with a fuel pressure gauge 131 and the constant flow pump 12 to control the volume flow, and the output constant flow liquid fuel enters the electronically controlled fuel gasification electric heater 11 to be heated and fully gasified; after the liquid fuel is gasified, it enters the first mass flow controller 181 through the insulated stainless steel delivery pipeline; after the air is pressurized to the pressure required for the experiment, it enters the second mass flow controller 182 through the stainless steel delivery pipeline with an air pressure gauge 132; the fuel and air enter the fuel premixing tank 19 after the mass flow equivalence ratio is controlled by the first mass flow controller 181 and the second mass flow controller 182 respectively, and the premixed gas fuel is delivered to the burner body 42; the gasified premixed gas sprays fuel from the burner nozzle 53 in the combustion channel, and the high-frequency ignition unit 48 ignites the fuel premixed gas.

[0098] S5: supply gas to the burner body 42 through the fuel gas generating device, ignite the premixed gas fuel by the high frequency ignition unit 48, open the second solenoid valve 302 and observe whether the pressure in the combustion chamber fluctuates to determine the valve opening, wait for the state to stabilize and meet the experimental standard, and then record the interaction process between the flame and the wall through the optical diagnosis system and the distributed temperature monitoring system;

[0099] S6: After completing the optical experimental data collection, start the flue gas collection mobile module 39 and move it to the center of the T-shaped flat plate slit assembly 43, extend the T-shaped ceramic flue gas collection tube 63 into the combustion chamber to collect the combustion product gas, and transport it to the external online flue gas analyzer 2 for combustion product analysis, and finally discharge it to the outside.

[0100] In summary, the experimental system and method for the interaction between liquid fuel high-pressure combustion flame and wall provided by the present invention simulates the process of flame hitting the wall in the cylinder under high-pressure conditions inside the engine, intuitively reflects the changing laws of microscopic variables in the flame-wall interaction process, and realizes in-depth research on the flame-wall combustion process.

Claims

1. Experimental system for interaction between liquid fuel high pressure combustion flame and wall surface, characterized by: It includes a pressurizing module, a fuel atomization and gasification module, a pressure-controllable combustion reaction chamber (1), a T-shaped flat plate slot burner assembly (25), a distributed temperature monitoring system, an optical diagnosis system, a pressure balance emission module, a flue gas real-time analysis module and a data integration and interaction system; The pressurizing module comprises: A pressure supply unit connected to the pressure-controllable combustion reaction chamber (1) via a high-pressure pipeline; The fuel boost unit and the air boost unit are both connected to the fuel atomization and gasification module through high-pressure pipelines; The fuel atomization and gasification module is connected to the pressure-controllable combustion reaction chamber (1) via a heat-insulating delivery pipeline; The T-shaped flat plate slit burner assembly (25) is arranged in a pressure-controllable combustion reaction chamber (1) and is used to simulate the dynamic interaction process between the flame and the wall under the working condition of an internal combustion engine. The T-shaped flat plate slit burner assembly (25) comprises a slit burner base (41), a burner body (42), a T-shaped flat plate slit assembly (43) and a servo-driven flat plate displacement mechanism (44). The burner body (42) is arranged below the slit burner base (41). The burner body (42) is connected to a fuel atomization and gasification module. The T-shaped flat plate slit assembly (43) is arranged above the slit burner base (41). The servo-driven flat plate displacement mechanism (44) is arranged on a steel frame platform behind the slit burner base (41). A high-frequency response piezoelectric sensor (57) is also arranged on the steel frame platform column of the servo-driven flat plate displacement mechanism (44). The distributed temperature monitoring system collects the wall temperature of the T-shaped flat plate slot burner assembly (25) and the thermal state parameters of the fuel delivery pipeline in real time, and transmits them to the data integration and interaction system for processing; The optical diagnostic system collects transient images and free radical distribution information of the flame-wall interaction process of the T-shaped flat plate slit assembly (43) during high-temperature combustion, and transmits the images to the data integration and interaction system for processing; The pressure balance discharge module is arranged on the pressure controllable combustion reaction chamber (1) to maintain the dynamic pressure balance of the pressure controllable combustion reaction chamber (1); The real-time flue gas analysis module collects and analyzes the combustion products of the pressure-controlled combustion reaction chamber (1), and transmits the processed data signals to the data integration and interaction system; The data integration and interaction system processes and interacts with data from sensors and devices of the pressurization module, fuel atomization and gasification module, distributed temperature monitoring system, optical diagnostic system and flue gas real-time analysis module.

2. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 1, characterized in that: The slot burner base (41) is a frame structure, and a high-temperature refractory ceramic plate (49) is provided on the top of the slot burner base (41); The burner body (42) includes a burner insulation body (51), a high-frequency ignition unit (48) and a burner nozzle (53). The burner insulation body (51) is fixedly installed below the slit burner base (41). The burner insulation body (51) includes insulation material, an electric heating wire and a burner K-type thermocouple (50). The burner insulation body (51) is connected to the air inlet end of the premixed fuel gas delivery pipeline (31). The burner K-type thermocouple (50) is inserted on both sides of the burner insulation body (51). The burner nozzle (53) is arranged above the burner insulation body (51). The top of the burner nozzle (53) is a burner nozzle (55). The top surface of the burner nozzle (55) is flush with the surface of the high-temperature refractory ceramic plate (49). The high-frequency ignition unit (48) is arranged on the side of the burner nozzle. A stepping servo motor (59) for driving the left and right screw rods of the servo-driven flat plate displacement mechanism (44) to rotate is provided on one side of the servo-driven flat plate displacement mechanism (44); a moving platform (61) is movably mounted on the servo-driven flat plate displacement mechanism (44); and a displacement sensor (60) is mounted on the servo-driven flat plate displacement mechanism (44); The T-shaped plate slit assembly (43) comprises a carbon silicon electric heating rod (45), a high-transmittance quartz plate (46), two parallel T-shaped alloy plates (47) with nitrided surfaces, a flat linear slide rail (56) and a flat K-type thermocouple (58); the carbon silicon electric heating rod (45) is vertically inserted into the T-shaped alloy plate (47), a temperature measuring hole is provided on the outer side of the T-shaped alloy plate (47), the flat K-type thermocouple (58) is arranged in the temperature measuring hole, and the two T-shaped alloy plates (47) are respectively fixed on On two moving platforms (61) of the servo-driven flat plate displacement mechanism (44), the two T-shaped alloy flat plates (47) are placed in parallel and symmetrically, the high-transmittance quartz plate (46) is fixed above the slit burner base (41), the two T-shaped alloy flat plates (47) and the two high-transmittance quartz plates (46) form a combustion channel, the flat plate linear slide rail (56) is fixedly mounted on the top of the slit burner base (41), and the T-shaped alloy flat plate (47) is movably mounted on the flat plate linear slide rail (56).

3. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 2, characterized in that: The pressure supply unit of the pressurizing module comprises an air compressor (10) and an air storage tank (7); the fuel boosting unit of the pressurizing module comprises a liquid fuel storage tank (15) and a fuel boosting pump (14); the air boosting unit of the pressurizing module comprises an air high-pressure storage tank (16) and an air boosting pump (17); The output end of the air compressor (10) is connected to the input end of the air storage tank (7) via a pipeline, the output end of the air storage tank (7) is connected to the pressure-controlled combustion reaction chamber (1) via a pipeline, the output end of the liquid fuel storage tank (15) is connected to the input end of the fuel booster pump (14) via a pipeline, and the output end of the air high-pressure storage tank (16) is connected to the input end of the air booster pump (17) via a pipeline; The fuel atomization and gasification module comprises: A fuel pretreatment unit, comprising a PID electrically controlled fuel gasification electric heater (11) and a constant flow pump (12); An equivalence ratio precise control unit comprises a first mass flow controller (181), a second mass flow controller (182) and a fuel premixing tank (19); The output end of the fuel boost pump (14) is connected to the constant flow pump (12), the PID electric fuel gasification electric heater (11), and the first mass flow controller (181) in sequence through pipelines; the output end of the air boost pump (17) is connected to the input end of the second mass flow controller (182) through a pipeline; the output ends of the first mass flow controller (181) and the second mass flow controller (182) are both connected to the input end of the fuel premixing tank (19) through pipelines; and the output end of the fuel premixing tank (19) is connected to the pressure-controllable combustion reaction chamber (1) through a pipeline after passing through a one-way valve (20).

4. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 3, characterized in that: The pressure-controlled combustion reaction chamber (1) comprises a cylinder (28) made of high-strength pressure-resistant steel. The cylinder (28) is designed with three-way orthogonal observation windows, which include a front observation window (30), a back observation window (35) and a top observation window (26). The front observation window (30), the back observation window (35) and the top observation window (26) are respectively arranged on the front and rear sides and the top of the cylinder (28). The top of the cylinder (28) is provided with a reaction chamber pressure gauge (27) and an explosion-proof safety valve (36). The side of the cylinder (28) is provided with a pressure gauge (27) and an explosion-proof safety valve (36). A reaction chamber pressure supply pipeline (29), an exhaust pipeline (33) and a smoke collection and delivery pipe (34) are separately provided. The reaction chamber pressure supply pipeline (29) is connected to the third solenoid valve (303) and then connected to the output end of the air storage tank (7). The lower part of the cylinder (28) is provided with a premixed fuel gas delivery pipeline (31) and a cabin penetration component (32) for the power supply and signal control circuit (54) to pass through. The premixed fuel gas delivery pipeline (31) is connected to the fuel premixing tank (19). The pipeline surface of the premixed fuel gas delivery pipeline (31) is wrapped with a pipeline insulation heating belt (52).

5. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 4, characterized in that: The optical diagnostic system comprises: An ICCD camera (5) is arranged directly behind the rear observation window (35) to achieve ns-level time-resolved imaging; A tunable light source system comprises a Nd:YAG laser generator (9) and a dye laser (8), wherein the Nd:YAG laser generator (9) can excite a pulsating laser of a set wavelength, and the pulsating laser is introduced into the dye laser (8) to generate a dye laser of a specific wavelength required for the experiment; The planar laser induced fluorescence system comprises a sheet light shaping component (6) and a high reflectivity optical lens group (37). The dye laser passes through the sheet light shaping component (6) and is then refracted into a combustion channel by the high reflectivity optical lens group (37).

6. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 5, characterized in that: The real-time flue gas analysis module comprises an online flue gas analyzer (2), a flue gas collection and delivery pipe (34), a flue gas collection module (38), a flue gas collection mobile module (39), a guide rail (40), a flue gas collection telescopic spring tube (62) and a T-shaped ceramic flue gas collection pipe (63). The T-shaped ceramic flue gas collection pipe (63) is fixed on the flue gas collection module (38). The flue gas collection telescopic spring tube (62) is connected to the flue gas collection module (38). The flue gas collection module (38) is fixed to the flue gas collection mobile modules (39) at both ends through a cross beam. Both ends of the guide rail (40) are fixedly mounted on the pressure-controllable combustion reaction chamber (1). The flue gas collection mobile module (39) is movably mounted on the guide rail (40). The flue gas collection telescopic spring tube (62) is connected to the flue gas collection and delivery pipe (34). The flue gas collection and delivery pipe (34) is connected to the online flue gas analyzer (2) after being connected to the first solenoid valve (301).

7. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 6, characterized in that: The pressure-balanced discharge module comprises a pressure reducing valve (4), which is installed at the air outlet of an exhaust pipe (33). A second solenoid valve (302) is also installed on the exhaust pipe (33). When the pressure of the pressure-controlled combustion reaction chamber (1) exceeds a threshold value, the second solenoid valve (302) opens to release the pressure.

8. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 7, characterized in that: The distributed temperature monitoring system comprises: A temperature controller (22) is electrically connected to the carbon silicon electric heating rod (45) to achieve temperature control of the carbon silicon electric heating rod (45); A multi-channel temperature acquisition instrument (24) is electrically connected to the flat plate K-type thermocouple (58) and the burner K-type thermocouple (50) to achieve synchronous temperature sampling; Infrared thermal imager, assists in verifying the surface temperature field distribution.

9. The experimental system for interaction between liquid fuel high pressure combustion flame and wall surface according to claim 8, characterized in that: The data integration and interaction system comprises: A multi-channel data acquisition module (21) transmits data with various devices and sensors via an RS485 to TTL module; The PC computer (23) and the control system are connected to the multi-channel data acquisition module (21) via USB to TTL.

10. An experimental system and method for the interaction between a liquid fuel high pressure combustion flame and a wall surface using any one of claims 1 to 9, characterized in that: The specific steps include: S1: Install the target experimental material plate on the T-shaped alloy plate (47); adjust the distance between the plates: control the movement of the moving platform (61) through the step servo motor (59), and monitor the distance between the plates with the displacement sensor (60). After adjusting the distance between the plates, start the temperature controller (22) to heat the plate using the carbon silicon electric heating rod (45), connect the power supply of the pipeline insulation heating belt (52) to preheat the entire pipeline, and at the same time, start the air compressor (10) to continuously compress the air and store it in the air storage tank (7). After compressing a sufficient amount of air, open the third solenoid valve (303) to pressurize the pressure-controlled combustion reaction chamber (1), and monitor the pressure of the device until the pressure value required for the experiment is reached; S2: Real-time monitoring of the combustion chamber pressure and wall temperature, as well as the preheating of the fuel delivery pipeline, through a high-frequency response piezoelectric sensor (57), a flat plate K-type thermocouple (58) array and a burner K-type thermocouple (50), until the experimental preset conditions are reached; S3: The fuel booster pump (14) and the air booster pump (17) respectively pressurize the liquid fuel and air in the liquid fuel storage tank (15) and the air high-pressure storage tank (16) to the pressure required for the experiment; after the liquid fuel is pressurized to the pressure required for the experiment, it passes through a delivery pipeline with a fuel pressure gauge (131) and a constant flow pump (12) to control the volume flow rate, and the output constant flow liquid fuel enters the electronically controlled fuel gasification electric heater (11) to be heated and fully gasified, and the liquid fuel enters the first mass flow controller (181) through the heat-insulating delivery pipeline after gasification; after the air is pressurized to the pressure required for the experiment, it passes through a delivery pipeline with an air pressure gauge (132) and enters the second mass flow controller (182); the constant flow pump (12) and the mass flow meter realize accurate control of the equivalence ratio; the air enters the fuel premixing tank (19) to realize full mixing of fuel / air, and the premixed gas fuel is delivered to the burner body (42) and ejected from the burner nozzle (53) in the combustion channel, and the high-frequency ignition unit (48) is used to ignite the fuel premixed gas; S4: Open the second solenoid valve (302) and observe whether the pressure in the combustion chamber fluctuates. After the state is stabilized and reaches the experimental standard, high-speed photography is used to synchronously record the flame development process, a planar laser induced fluorescence system captures the two-dimensional distribution of free radicals, and a distributed temperature monitoring system records the process temperature; S5: After completing the optical experimental data collection, the smoke collection mobile module (39) is started to move to the center of the adjustable spacing T-shaped plate slit (43), and the T-shaped ceramic smoke collection tube (63) is extended into the combustion chamber to collect the combustion product gas, and transported to the external online smoke analyzer (2) for combustion product analysis, and finally discharged to the outside; S6: Data processing, the multi-channel data acquisition module (21) acquires the raw data, transmits it to the PC computer (23) to generate a data packet, and performs data visualization processing.

Images