Combustion heat release rule simulation test device based on constant volume bomb

Abstract

The invention relates to the field of internal combustion engine testing devices, in particular to a combustion heat release rule simulation testing device based on a constant volume bomb. The testing device comprises a combustion heat release rule analysis device, a variable motion rule vertical motion mechanism, a piston simulation device, a variable temperature combustion chamber wall surface constant volume bomb body, a variable temperature combustion chamber wall surface control module, a spray penetration distance real-time adjusting device and a fuel oil wall collision area and temperature change measuring device. According to the invention, gradient temperature control of the wall surface of the combustion chamber is realized through the variable-temperature combustion chamber wall surface constant-volume bomb body, real-time adjustment of the spray penetration distance is realized through the spray penetration distance real-time adjustment device, and simulation of the influence of the volume change in the cylinder on the heat release rate is realized through the variable-motion-rule vertical motion mechanism and the optical simulation device. Development of the fuel oil wall collision process and energy change measurement are achieved through the fuel oil wall collision area and temperature measuring device, and a combustion temperature field is measured and reconstructed in an omnibearing mode through the continuous combustion temperature measuring device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of internal combustion engine testing devices, in particular to a combustion heat release law simulation testing device based on a constant volume bomb. BACKGROUND

[0002] The control of the low-temperature combustion organization mode in the cylinder of an internal combustion engine is fundamentally the control of the combustion heat release law. The combustion heat release law is a specific embodiment of the formation and combustion process of the mixture, and also reflects the working state of the engine and affects the generation of exhaust products. Therefore, the control effect of the combustion process can be evaluated by the combustion heat release law.

[0003] There are many factors that affect the combustion heat release law in the cylinder of an internal combustion engine. Among them, the spray penetration distance affects whether the fuel spray collides with the wall and the size of the fuel collision area, thereby affecting the spray shape and fuel evaporation mixing. The combustion chamber wall temperature affects the heat transfer from the cylinder to the outside, which will have a direct impact on the combustion heat release law.

[0004] Currently, the research on combustion heat release law control is generally obtained by actual engine operation. However, the actual engine cannot directly observe the influence of micro factors such as the development of fuel spray in the cylinder, the jet state when the fuel collides with the wall, and the combustion organization in the cylinder on the combustion heat release law. Moreover, the actual engine lacks a direct means to observe the change of combustion temperature. If the fuel spray development and combustion are studied through a constant volume bomb, most constant volume bombs have fixed volume and cannot equivalently affect the influence of the dynamic volume change in the engine cylinder on the spray development and heat release law. At the same time, most constant volume bombs can only conduct static injection, the spray penetration distance is fixed, and the wall thermal boundary condition in the constant volume bomb simulation combustion exists simulation distortion. Moreover, the ordinary constant volume bomb relies on a single thermocouple or low-frequency infrared measurement, which cannot capture the transient temperature field of the flame front propagation and the temperature fault caused by local quenching, thereby failing to effectively simulate and reverse the in-cylinder heat release law of the actual engine.

[0005] Patent document No. CN109738192B discloses a control system for the wall temperature in a constant volume bomb spray wall collision experiment. To overcome the problem of uncontrollable wall temperature during the spray wall collision test based on a constant volume bomb, the system arranges the wall collision test plate in a wall cooling jacket, uses an ECU to monitor the flow rate of the cooling liquid pipeline inlet section and the temperature of the inlet and outlet sections of the wall cooling jacket to adjust the flow rate of the cooling liquid flowing into the wall cooling jacket, thereby achieving control of the wall temperature. Although this device can theoretically adjust the temperature of the fuel collision wall, it cannot accurately simulate the wall temperature of the constant volume bomb body, and the thermal boundary conditions of other walls are distorted. Moreover, this device is a constant volume bomb device for static spray testing, and cannot accurately simulate the heat release law of the actual engine.

[0006] For example, the patent document with publication number CN118150173A discloses a spray testing device and method for simulating engine in-cylinder pressure and turbulence intensity. In order to solve the problems of limited adjustment of pressure and turbulence and single turbulence mode in the existing constant volume bomb device, a turbulence intensity control assembly composed of a servo mechanism and a propeller is used to simulate the turbulence process in the engine cylinder, thereby simulating the effect of spray atomization in the cylinder. The turbulence intensity is adjusted by the propeller assembly in the bomb. Although the device forms the turbulence process in the cylinder by the propeller driving the airflow in the cylinder, the propeller is exposed in the constant volume bomb, which changes the overall effect of turbulence, making it difficult to simulate the in-cylinder combustion law, and lacking adjustment of the thermal boundary conditions in the constant volume bomb. SUMMARY

[0007] The present application aims to solve the technical problems existing in the prior art, and provides a combustion heat release law simulation testing device based on a constant volume bomb.

[0008] The technical solution of the present application to solve the above technical problems is as follows: a combustion heat release law simulation testing device based on a constant volume bomb, the testing device comprising a combustion heat release law analysis device, a variable motion law vertical motion mechanism, a high-temperature and high-pressure transparent optical piston simulation device, a variable temperature combustion chamber wall constant volume bomb body, a variable temperature combustion chamber wall control module, a spray penetration distance real-time adjustment device, and a fuel wall impact area and temperature change measurement device.

[0009] The variable motion law vertical motion mechanism comprises two symmetrically distributed first and second variable motion law vertical motion mechanisms and a motion law simulation controller. The first variable motion law vertical motion mechanism comprises a first high-speed hydraulic drive and a first linear transmission connecting support rod composed of a first fixed support rod and a first high-speed motion rod. The second variable motion law vertical motion mechanism comprises a second high-speed hydraulic drive and a second linear transmission connecting support rod composed of a second fixed support rod and a second high-speed motion rod.

[0010] The first and second high-speed motion rods are fixedly installed inside the first and second fixed support rods and reciprocate. One end of the first fixed support rod is connected to the first high-speed hydraulic drive, and one end of the second fixed support rod is connected to the second high-speed hydraulic drive.

[0011] The first and second high-speed motion rods are connected to the piston simulation device, and the motion law simulation controller is connected to the first and second high-speed hydraulic drives. Further, when the high-speed drive outputs the motion law simulation controller drive signal from the main controller, the first and second high-speed hydraulic drives are controlled by the motion law simulation controller to simulate the piston compression stroke and work stroke motion law.

[0012] The piston simulation device is a simulation device for simultaneous testing of fuel wall collision area and wall collision temperature change, and first and second high-speed motion rod connecting ports are arranged at both ends of the lower surface of the piston simulation device, and a high-response speed thin film temperature sensor array for measuring the temperature change after fuel wall collision is embedded in the upper surface of the piston simulation device.

[0013] Further, the variable-temperature combustion chamber wall constant-volume bomb body comprises a first upper end face, a first lower end face, and a composite variable-temperature combustion chamber wall, the first upper end face comprises an oil injector mounting port one, an air inlet, an exhaust port, a mounting port two mounting a cylinder pressure sensor, and a high-speed thermocouple sensor mounting port symmetrically distributed near the oil injector mounting port one, the first lower end face comprises a third observation port, a thin film temperature sensor signal transmission port, and a fixed support rod through port, and the third observation port is fixedly installed with a third observation quartz window;

[0014] The fuel wall collision area and temperature change measuring device comprises a high-speed camera distributed below the third observation quartz window, the high-speed camera is connected with a main controller in control, and the cylinder pressure sensor is connected with a combustion heat release regularity analysis device.

[0015] Further, the variable-temperature combustion chamber wall of the variable-temperature combustion chamber wall constant-volume bomb body adopts a split modular structure, comprising a constant-volume bomb body wall and a variable-temperature combustion chamber wall, the constant-volume bomb body wall and the variable-temperature combustion chamber wall are provided with at least two high-speed thermocouple sensor transmission through holes, first and second observation ports are opened on both sides of the constant-volume bomb body wall, the first observation port is provided with a first observation quartz window, and the second observation port is provided with a second observation quartz window, the constant-volume bomb body wall is provided with a constant-volume bomb body wall cooling liquid inlet and outlet port and a variable-temperature combustion chamber wall cooling liquid micro-channel inlet and outlet port, a serpentine cooling liquid flow channel one is arranged in the constant-volume bomb body wall, the cooling liquid inlet and outlet port of the constant-volume bomb body wall is connected with the serpentine cooling liquid flow channel one in the constant-volume bomb body wall, and the constant-volume bomb body wall is provided with a flange plate matched with the variable-temperature combustion chamber wall.

[0016] Further, the variable temperature combustion chamber wall surface adopts a gradient composite structure design, and is a multi-layer functional wall, including: a heat insulation layer, a micro-channel cooling layer, an embedded gradient heating layer, and a high-temperature radiation layer. The heat insulation layer is filled with aerogel to block heat conduction and accelerate the wall surface to quickly reach the simulation condition. The high-temperature radiation layer is made of high-temperature resistant ceramic material and directly contacts the combustion chamber environment. The embedded gradient heating layer integrates a heating element array to form at least one independent temperature control zone. The micro-channel cooling layer is internally provided with a serpentine cooling liquid flow channel two, which is independent of the serpentine cooling liquid flow channel one of the bomb body wall surface. The temperature of at least one independent temperature control zone in the embedded gradient heating layer is independently fed back by at least one K-type thermocouple, and is controlled by a variable temperature combustion chamber wall surface control module to realize gradient temperature control of the variable temperature combustion chamber wall surface from top to bottom, thereby restoring the boundary distribution of the temperature field in the actual engine cylinder.

[0017] Further, a flange plate, a bellows expansion joint, and a force bearing substrate are arranged between the constant volume bomb body wall surface and the variable temperature combustion chamber wall surface. The constant volume bomb body wall surface and the variable temperature combustion chamber wall surface are pre-tightened to the butt flange plate through hydraulic bolts. The bellows expansion joint is used to compensate for the thermal expansion difference, and the force bearing substrate bears mechanical stress.

[0018] Further, the test device further comprises: an air supply device, a nitrogen supply device, an exhaust gas recovery device, a wall surface cooling device, a signal acquisition device, a fuel wall collision area and temperature measuring device, a continuous combustion temperature measuring device, and a combustion heat release law analysis device.

[0019] The wall surface cooling device comprises a constant volume bomb body wall surface cooling device, a constant volume bomb body wall surface cooling liquid inlet ball valve, a constant volume bomb body wall surface cooling liquid outlet ball valve, a variable temperature combustion chamber wall surface cooling device, a variable temperature combustion chamber wall surface cooling liquid inlet ball valve, and a variable temperature combustion chamber wall surface cooling liquid outlet ball valve. The outlet of the constant volume bomb body wall surface cooling device is connected with the constant volume bomb body wall surface cooling liquid inlet ball valve. The inlet of the constant volume bomb body wall surface cooling device is connected with the constant volume bomb body wall surface cooling liquid outlet ball valve. The outlet of the variable temperature combustion chamber wall surface cooling device is connected with the variable temperature combustion chamber wall surface cooling liquid inlet ball valve. The inlet of the variable temperature combustion chamber wall surface cooling device is connected with the variable temperature combustion chamber wall surface cooling liquid outlet ball valve.

[0020] Further, the air supply device comprises an air storage tank and a first proportional electromagnetic valve. The air storage tank is connected with the first proportional electromagnetic valve. The first proportional electromagnetic valve is connected with an air inlet. The first proportional electromagnetic valve is connected with a main controller.

[0021] The nitrogen supply device comprises a nitrogen storage tank and a second proportional electromagnetic valve, the nitrogen storage tank is connected with the second proportional electromagnetic valve, the second proportional electromagnetic valve is connected with the gas inlet, and the second proportional electromagnetic valve is connected with the main controller;

[0022] The exhaust gas recovery device comprises an exhaust gas recovery treatment tank and an exhaust valve, the exhaust gas recovery treatment tank is connected with the exhaust valve, the exhaust valve is connected with the exhaust port, and the exhaust valve is connected with the main controller.

[0023] The installation positions of the gas inlet, the exhaust port, the fixed support rod through the port, the first connecting port of the first high-speed movement rod, the second connecting port of the second high-speed movement rod, the cooling liquid inlet and outlet port of the bullet body wall, the cooling liquid micro-channel inlet and outlet port of the variable-temperature combustion chamber wall, the first, second and third observation quartz windows and the thin film temperature sensor signal transmission port are all sealed by heat insulation sealing rings, and high-temperature-resistant heat insulation sealing rings are arranged around the embedded positions of the thin film temperature sensors arranged on the surface of the piston simulation device to isolate the influence of the surface of the piston simulation device on the measurement of the fuel wall collision temperature change by the sensors.

[0024] Further, the spray penetration distance real-time adjustment device comprises a first high-pressure common rail fuel supply device, a second high-pressure common rail fuel supply device, a first high-speed electromagnetic valve, a second high-speed electromagnetic valve, a third high-speed electromagnetic valve, a flow collecting pipe and an oil injector, the first high-speed electromagnetic valve is connected with the fuel output end of the first high-pressure common rail fuel supply device, and the first high-speed electromagnetic valve is connected with the main controller;

[0025] The second high-speed electromagnetic valve is connected with the fuel output end of the second high-pressure common rail fuel supply device, and the second high-speed electromagnetic valve is connected with the main controller, the first high-speed electromagnetic valve is connected with one flow inlet end of the flow collecting pipe, the second high-speed electromagnetic valve is connected with another flow inlet end of the flow collecting pipe, the third high-speed electromagnetic valve is connected with a flow outlet end of the flow collecting pipe, and the third high-speed electromagnetic valve is connected with the main controller;

[0026] The first high-pressure common rail fuel supply device and the second high-pressure common rail fuel supply device are in parallel connection with the first high-speed electromagnetic valve and the second high-speed electromagnetic valve, and the first high-speed electromagnetic valve, the second high-speed electromagnetic valve and the third high-speed electromagnetic valve are controlled by the main controller to realize the switching of the oil supply pressure and whether to supply oil, so as to realize the real-time adjustment of the spray penetration distance.

[0027] Further, the continuous combustion temperature measurement device comprises a high-speed infrared thermal imager, a thermocouple array and a laser temperature measurement device, the laser temperature measurement device comprises a signal generator, a laser controller, a first laser generator, a second laser generator, a laser coupler, a laser beam splitter, a first collimator, a second collimator, a etalon and a photoelectric receiver.

[0028] The high-speed infrared thermal imager is connected with the main controller, is arranged at an angle of ° with the vertical line of the center of the second observation quartz window, mirror surface reflection is avoided, the signal generator is connected with the main controller, the signal generator is connected with the laser controller, the laser controller is connected with the first laser generator and the second laser generator, and laser output by the two laser generators is input into the laser beam splitter through the laser coupler.

[0029] Further, the laser output by the two laser generators is input into the laser beam splitter through the laser coupler, and the following settings are further included:

[0030] The laser beam splitter divides the laser into two paths, one of which is input into the second collimator, is received by the etalon, and the etalon is connected with the signal acquisition device, so as to calibrate the time axis and the frequency offset of the laser relative to the scanning starting point;

[0031] The other laser is input into the first collimator, is collected by the photoelectric receiver through the first observation quartz window and the second observation quartz window, the photoelectric receiver is connected with the signal acquisition device, and spectral data of combustion development are transmitted to the signal acquisition device;

[0032] The thermocouple array includes two symmetrically arranged thermocouples arranged near the lower end of the oil injector nozzle, which are used to measure the temperature of the initial development of the spray and the quenching zone of the combustion wall, two symmetrically arranged thermocouples arranged at the approximate position of the spray penetration distance, which are used to measure the temperature of the spray development path and the combustion core region and the flame front development, and two symmetrically arranged thermocouples arranged at the position of the wall surface near the 90% penetration distance, which are used to measure the temperature of the near-wall rolling path and the breaking development of the impingement jet fuel.

[0033] The device solves the problems that most constant volume bombs cannot equivalently affect the spray development and heat release law of the engine cylinder dynamic volume change, the wall temperature thermal boundary condition is distorted, the spray penetration distance is passively fixed, the spray impingement development process and energy change cannot be quantified at the same time, and the heat release rate is distorted due to single-point measurement of the combustion temperature when the constant volume bomb is used to study the combustion heat release law.

[0034] The variable-temperature combustion chamber wall constant volume bomb body realizes the gradient temperature control of the combustion chamber wall, the spray penetration distance real-time adjustment device realizes the real-time adjustment of the spray penetration distance, the variable motion law vertical motion mechanism and the optical simulation device realize the simulation of the influence of the cylinder volume change on the heat release rate, the fuel impingement area and temperature measurement device realizes the development and energy change measurement of the fuel impingement process, and the continuous combustion temperature measurement device realizes the all-around measurement of the reconstructed combustion temperature field, so as to achieve the purpose of simulating the cylinder combustion heat release law based on the constant volume bomb and reducing the error. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Structure diagram of the present application;

[0036] Figure 2 Structure diagram of the present application;

[0037] Figure 3 Structure diagram of the present application;

[0038] Figure 4 Structure diagram of the present application;

[0039] Figure 5 Structure diagram of the present application;

[0040] Figure 6 Structure diagram of the present application;

[0041] Figure 7 Structure diagram of the present application;

[0042] Figure 8 Structure diagram of the present application;

[0043] Figure: 1, first proportional solenoid valve; 2, second proportional solenoid valve; 3, air storage tank; 4, nitrogen storage tank; 5, combustion heat release regularity analysis device; 6, variable temperature combustion chamber wall surface control module; 7, first high-speed hydraulic driver; 8, second high-speed hydraulic driver; 9, first fixed support rod; 10, second fixed support rod; 11, third observation quartz window; 12, piston simulation device; 13, first observation quartz window; 14, first high-speed movement rod; 15, second high-speed movement rod; 16, second observation quartz window; 17, cylinder pressure sensor; 18, air inlet; 19, exhaust port; 20, constant volume bomb body wall surface and variable temperature combustion chamber wall surface connecting part; 21, constant volume bomb body wall surface; 22, variable temperature combustion chamber wall surface; 23, fuel injector; 24, constant volume bomb body wall surface cooling liquid inlet ball valve; 25, exhaust valve; 26, constant volume bomb body wall surface cooling liquid outlet ball valve; 27, constant volume bomb body wall surface cooling device; 28, exhaust gas recovery device; 29, variable temperature combustion chamber wall surface cooling device; 30, variable temperature combustion chamber wall surface cooling liquid inlet ball valve; 31, variable temperature combustion chamber wall surface cooling liquid outlet ball valve; 32, movement regularity simulation controller; 33, main controller; 34, first high-pressure common rail fuel supply device; 35, second high-pressure common rail fuel supply device; 36, first high-speed solenoid valve; 37, second high-speed solenoid valve; 38, manifold; 39, third high-speed solenoid valve; 40, upper end surface; 41, lower end surface; 42, high-speed thermocouple sensor mounting port; 43, thin film temperature sensor signal transmission port; 44, fixed support rod passing port; 45, variable temperature combustion chamber wall surface cooling liquid microchannel inlet and outlet port; 46, signal generator; 47, laser controller; 48, first laser generator; 49, second laser generator; 50, laser coupler; 51, laser beam splitter; 52, second collimator; 53, etalon; 54, signal acquisition device; 55, first collimator; 56, high-speed camera; 57, photoelectric receiver; 58, high-speed infrared thermal imager; 59, thermocouple array;

[0044] S1, thermal insulation layer; S2, microchannel cooling layer; S3, high-temperature radiation layer; S4, embedded gradient heating layer; S5, piston simulation device body; S6, fuel wall collision area and temperature test range; S7, thin film temperature sensor array; S8, first high-speed movement rod connecting port; S9, second high-speed movement rod second connecting port; S10, bellows expansion joint; S11, flange; S12, force-bearing base plate; S13, hydraulic bolt. DETAILED DESCRIPTION

[0045] The application will be further described below in conjunction with the drawings.

[0046] Please refer to the drawings Figures 1-8The embodiment provides a combustion heat release law simulation test device based on a constant volume bomb, and the test device comprises a combustion heat release law analysis device 5, a variable motion law vertical motion mechanism, a high-temperature and high-pressure transparent optical piston simulation device 12, a variable-temperature combustion chamber wall constant volume bomb body, a variable-temperature combustion chamber wall control module 6, a spray penetration distance real-time adjustment device, and a fuel wall collision area and temperature change measurement device.

[0047] The variable motion law vertical motion mechanism comprises a first variable motion law vertical motion mechanism and a second variable motion law vertical motion mechanism which are symmetrically distributed, and a motion law simulation controller 32, the first variable motion law vertical motion mechanism comprises a first high-speed hydraulic driver 7 and a first linear transmission connection support rod which is composed of a first fixed support rod 9 and a first high-speed motion rod 14, and the second variable motion law vertical motion mechanism comprises a second high-speed hydraulic driver 8 and a second linear transmission connection support rod which is composed of a second fixed support rod 10 and a second high-speed motion rod 15.

[0048] The first high-speed motion rod 14 and the second high-speed motion rod 15 are fixedly installed in the first fixed support rod 9 and the second fixed support rod 10 respectively and reciprocate, one end of the first fixed support rod 9 is connected with the first high-speed hydraulic driver 7, and one end of the second fixed support rod 10 is connected with the second high-speed hydraulic driver 8.

[0049] The first high-speed motion rod 14 and the second high-speed motion rod 15 are connected with the piston simulation device 12, the motion law simulation controller 32 is connected with the first high-speed hydraulic driver 7 and the second high-speed hydraulic driver 8, and further, the second high-speed hydraulic driver 8 is controlled by the motion law simulation controller 32 to control the first high-speed hydraulic driver 7 and the second high-speed hydraulic driver 8 to simulate the motion law of a piston compression stroke and a working stroke when the motion law simulation controller 32 drives signal output by a main controller 33.

[0050] The piston simulation device 12 is a simulation device for simultaneously testing a fuel wall collision area and a wall collision temperature change, first high-speed motion rod connecting ports S8 and second high-speed motion rod connecting ports S9 are arranged at two ends of a lower surface of the piston simulation device 12, and a high-response speed thin film temperature sensor array S7 for measuring a temperature change after fuel collides with a wall is embedded in an upper surface of the piston simulation device 12.

[0051] The constant volume bomb body of the variable temperature combustion chamber wall surface comprises a first upper end surface 40 and a first lower end surface 41, and a composite variable temperature combustion chamber wall surface, the first upper end surface 40 comprises a first mounting port, an air inlet 18, an exhaust port 19, a second mounting port for mounting a cylinder pressure sensor 17, and a high-speed thermocouple sensor mounting port 42 symmetrically distributed near the first mounting port, and the first lower end surface 41 comprises a third observation port, a thin film temperature sensor signal transmission port 43, and a fixed support rod passing port 44, and the third observation port is fixedly installed with a third observation quartz window 11.

[0052] The fuel wall collision area and temperature change measuring device comprises a high-speed camera 56 distributed below the third observation quartz window 11, the high-speed camera 56 is connected with a main controller 33 in control connection, and the cylinder pressure sensor 17 is connected with a combustion heat release regularity analysis device 5.

[0053] The variable temperature combustion chamber wall surface of the constant volume bomb body of the variable temperature combustion chamber wall surface adopts a split modular structure, comprises a constant volume bomb body wall surface 21 and a variable temperature combustion chamber wall surface 22, the constant volume bomb body wall surface 21 and the variable temperature combustion chamber wall surface 22 are provided with at least two high-speed thermocouple sensor transmission passing holes, the constant volume bomb body wall surface 21 is provided with a first observation port and a second observation port on both sides, the first observation port is provided with a first observation quartz window 13, the second observation port is provided with a second observation quartz window 16, the constant volume bomb body wall surface 21 is provided with a constant volume bomb body wall surface cooling liquid inlet and outlet port and a variable temperature combustion chamber wall surface cooling liquid micro-channel inlet and outlet port 45, the constant volume bomb body wall surface 21 is internally provided with a serpentine cooling liquid flow channel one, the cooling liquid inlet and outlet port of the constant volume bomb body wall surface 21 is connected with the serpentine cooling liquid flow channel one inside the constant volume bomb body wall surface 21, and the constant volume bomb body wall surface 21 is provided with a flange S11 which is connected with the variable temperature combustion chamber wall surface 22.

[0054] The variable temperature combustion chamber wall surface 22 adopts a gradient composite structure design, is a multi-layer functional wall body, and comprises a heat insulation layer S1, a micro-channel cooling layer S2, an embedded gradient heating layer S4 and a high-temperature radiation layer S3. The heat insulation layer S1 is filled with aerogel to block heat conduction and accelerate the wall surface to quickly reach the simulation condition. The high-temperature radiation layer S3 is made of high-temperature resistant ceramic material and directly contacts the combustion chamber environment. The embedded gradient heating layer S4 integrates a heating element array to form at least four independent temperature control zones. The micro-channel cooling layer S2 is internally provided with a serpentine cooling liquid flow channel two which is independent of the serpentine cooling liquid flow channel one of the constant volume bomb body wall surface 21. The temperature of the at least four independent temperature control zones inside the embedded gradient heating layer S4 is independently fed back by at least four K-type thermocouples and is controlled by a variable temperature combustion chamber wall surface control module 6 to realize gradient temperature control of the variable temperature combustion chamber wall surface 22 from top to bottom, thereby restoring the temperature field boundary distribution in the actual engine cylinder.

[0055] As shown in the accompanying drawings Figure 3As shown, the flange S11, the bellows expansion joint S10 and the force bearing base plate S12 are arranged between the constant volume bomb body wall surface 21 and the variable temperature combustion chamber wall surface 22, and the constant volume bomb body wall surface 21 and the variable temperature combustion chamber wall surface 22 are pre-tightened to the butt flange S11 through the hydraulic bolts S13, wherein the bellows expansion joint S10 is used to compensate the thermal expansion difference, and the force bearing base plate S12 bears the mechanical stress.

[0056] The test device further comprises: an air supply device, a nitrogen supply device, an exhaust gas recovery device, a wall surface cooling device, a signal acquisition device 54, a fuel wall collision area and temperature measuring device, a continuous combustion temperature measuring device, and a combustion heat release law analysis device 5.

[0057] The wall surface cooling device comprises a constant volume bomb body wall surface cooling device 27, a constant volume bomb body wall surface cooling liquid inlet ball valve 24, a constant volume bomb body wall surface cooling liquid outlet ball valve 26, a variable temperature combustion chamber wall surface cooling device 29, a variable temperature combustion chamber wall surface cooling liquid inlet ball valve 30 and a variable temperature combustion chamber wall surface cooling liquid outlet ball valve 31, the outlet of the constant volume bomb body wall surface cooling device 27 is connected with the constant volume bomb body wall surface cooling liquid inlet ball valve 24, the inlet of the constant volume bomb body wall surface cooling device 27 is connected with the constant volume bomb body wall surface cooling liquid outlet ball valve 26, the outlet of the variable temperature combustion chamber wall surface cooling device 29 is connected with the variable temperature combustion chamber wall surface cooling liquid inlet ball valve 30, and the inlet of the variable temperature combustion chamber wall surface cooling device 29 is connected with the variable temperature combustion chamber wall surface cooling liquid outlet ball valve 31.

[0058] The air supply device comprises an air storage tank 3 and a first proportional electromagnetic valve 1, the air storage tank 3 is connected with the first proportional electromagnetic valve 1, the first proportional electromagnetic valve 1 is connected with an air inlet 18, and the first proportional electromagnetic valve 1 is connected with the main controller 33.

[0059] The nitrogen supply device comprises a nitrogen storage tank 4 and a second proportional electromagnetic valve 2, the nitrogen storage tank 4 is connected with the second proportional electromagnetic valve 2, the second proportional electromagnetic valve 2 is connected with the air inlet 18, and the second proportional electromagnetic valve 2 is connected with the main controller 33.

[0060] The exhaust gas recovery device comprises an exhaust gas recovery treatment tank 28 and an exhaust valve 25, the exhaust gas recovery treatment tank 28 is connected with the exhaust valve 25, the exhaust valve 25 is connected with an exhaust outlet 19, and the exhaust valve 25 is connected with the main controller 33.

[0061] The air inlet 18, the exhaust port 19, the fixed support rod through port 44, the first connection port S8 of the first high-speed motion rod 14, the second connection port S9 of the second high-speed motion rod, the cooling liquid inlet and outlet port of the bullet body wall, the cooling liquid micro-channel inlet and outlet port 45 of the variable temperature combustion chamber wall, the installation positions of the first, second and third observation quartz windows and the thin film temperature sensor signal transmission port 43 are all sealed by heat insulation sealing rings, and the embedded positions of the thin film temperature sensors arranged on the surface of the piston simulation device 12 are surrounded by high-temperature resistant heat insulation sealing rings to isolate the influence of the surface of the piston simulation device 12 on the sensor measurement of the fuel wall temperature change measurement;

[0062] The spray penetration distance real-time adjustment device includes a first high-pressure common rail fuel supply device 34, a second high-pressure common rail fuel supply device 35, a first high-speed electromagnetic valve 36, a second high-speed electromagnetic valve 37, a third high-speed electromagnetic valve 39, a flow collector 38 and an oil injector 23. The first high-speed electromagnetic valve 36 is connected with the fuel output end of the first high-pressure common rail fuel supply device 34, and the first high-speed electromagnetic valve 36 is connected with the main controller 33.

[0063] The second high-speed electromagnetic valve 37 is connected with the fuel output end of the second high-pressure common rail fuel supply device 35, and the second high-speed electromagnetic valve 37 is connected with the main controller 33. The first high-speed electromagnetic valve 36 is connected with one flow inlet end of the flow collector 38, the second high-speed electromagnetic valve 37 is connected with another flow inlet end of the flow collector 38, the third high-speed electromagnetic valve 39 is connected with a flow outlet end of the flow collector 38, and the third high-speed electromagnetic valve 39 is connected with the main controller 33.

[0064] The first high-speed electromagnetic valve 36 and the second high-speed electromagnetic valve 37, the first high-pressure common rail fuel supply device 34 and the second high-pressure common rail fuel supply device 35 are in parallel connection, and the main controller 33 controls the on-off of the first high-speed electromagnetic valve 36, the second high-speed electromagnetic valve 37 and the third high-speed electromagnetic valve 39 to realize the switching of the oil supply pressure and whether to supply oil, so as to realize the real-time adjustment of the spray penetration distance.

[0065] The continuous combustion temperature measurement device includes a high-speed infrared thermal imager 58, a thermocouple array 59 and a laser temperature measurement device. The laser temperature measurement device includes a signal generator 46, a laser controller 47, a first laser generator 48, a second laser generator 49, a laser coupler 50, a laser beam splitter 51, a first collimator 55, a second collimator 52, a etalon 53 and a photoelectric receiver 57.

[0066] The high-speed infrared thermal imager 58 is connected with the main controller 33, and is arranged at an angle of 45° with the vertical line of the center of the second observation quartz window 16 to avoid mirror reflection.

[0067] The laser light output by the two laser generators is input into the laser beam splitter 51 through the laser coupler 50, and the following settings are further included:

[0068] The laser beam splitter 51 divides the laser light into two paths, one of which is input into the second collimator 52 and received by the etalon 53, which is connected with the signal acquisition device 54 and used to calibrate the time axis and the frequency offset of the laser relative to the scanning starting point;

[0069] The other laser light is input into the first collimator 55, and is collected by the photoelectric receiver 57 through the first observation quartz window 13 and the second observation quartz window 16, the photoelectric receiver 57 is connected with the signal acquisition device 54 and transmits the spectral data of the combustion development to the signal acquisition device 54;

[0070] Please refer to the accompanying drawings Figure 6 The thermocouple array 59 includes two symmetrically arranged thermocouples a1 and a2 arranged near the lower end of the injection hole of the oil injector 23, which are used to measure the temperature of the initial development of the spray and the quenching zone of the combustion wall surface, two symmetrically arranged thermocouples a3 and a4 arranged at the approximate position of the penetration distance, which are used to measure the temperature of the development path of the spray, the core region of the combustion and the development of the flame front, and two symmetrically arranged thermocouples a5 and a6 arranged at the position of the 90% penetration distance of the near-wall temperature combustion chamber wall surface 22, which are used to measure the temperature of the development of the near-wall tumble flow path and the impingement jet fuel breaking.

[0071] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A constant-volume bomb-based simulation test device for combustion heat release rate, characterized in that, The test device comprises a combustion heat release law analysis device (5), a variable motion law vertical motion mechanism, a piston simulation device (12), a variable temperature combustion chamber wall constant volume bomb body, a variable temperature combustion chamber wall control module (6), a spray penetration distance real-time adjustment device, a fuel wall collision area and temperature change measurement device; The variable motion law vertical motion mechanism comprises a first variable motion law vertical motion mechanism and a second variable motion law vertical motion mechanism which are symmetrically distributed, and a motion law simulation controller (32), the first variable motion law vertical motion mechanism comprises a first high-speed hydraulic driver (7) and a first linear transmission connection support rod which is composed of a first fixed support rod (9) and a first high-speed motion rod (14), and the second variable motion law vertical motion mechanism comprises a second high-speed hydraulic driver (8) and a second linear transmission connection support rod which is composed of a second fixed support rod (10) and a second high-speed motion rod (15); The first high-speed motion rod (14) and the second high-speed motion rod (15) are fixedly installed in the first fixed support rod (9) and the second fixed support rod (10) respectively and reciprocate, one end of the first fixed support rod (9) is connected with the first high-speed hydraulic driver (7), and one end of the second fixed support rod (10) is connected with the second high-speed hydraulic driver (8); The first high-speed motion rod (14) and the second high-speed motion rod (15) are connected with the piston simulation device (12), and the motion law simulation controller (32) is connected with the first high-speed hydraulic driver (7) and the second high-speed hydraulic driver (8); The piston simulation device (12) is provided with a first high-speed motion rod connecting port (S8) and a second high-speed motion rod second connecting port (S9) at two ends of the lower surface respectively, and a thin film temperature sensor array (S7) for measuring the temperature change after the fuel collides with the wall is embedded on the upper surface of the piston simulation device (12).

2. The constant-volume bomb-based combustion heat release rate simulation test device according to claim 1, characterized in that, The variable temperature combustion chamber wall constant volume bomb body comprises a first upper end face (40), a first lower end face (41) and a composite variable temperature combustion chamber wall, the first upper end face (40) comprises an oil injector mounting port one, an air inlet (18), an exhaust port (19), a mounting port two in which a cylinder pressure sensor (17) is mounted and high-speed thermocouple sensor mounting ports (42) which are symmetrically distributed near the oil injector mounting port one, the first lower end face (41) comprises a third observation port, a thin film temperature sensor signal transmission port (43) and a fixed support rod passing port (44), and the third observation port is fixedly installed with a third observation quartz window (11); The fuel wall collision area and temperature change measurement device comprises a high-speed camera (56) which is distributed below the third observation quartz window (11), the high-speed camera (56) is connected with a main controller (33) in control, and the cylinder pressure sensor (17) is connected with the combustion heat release law analysis device (5).

3. The constant-volume bomb-based combustion heat release rate simulation test device according to claim 2, characterized in that, The variable-temperature combustion chamber wall surface of the constant-volume bomb body adopts a split modular structure, comprising a constant-volume bomb body wall surface (21) and a variable-temperature combustion chamber wall surface (22), the constant-volume bomb body wall surface (21) and the variable-temperature combustion chamber wall surface (22) are provided with at least two high-speed thermocouple sensor transmission through holes, the constant-volume bomb body wall surface (21) is provided with a corresponding first observation port and a second observation port on both sides, the first observation port is provided with a first observation quartz window (13), the second observation port is provided with a second observation quartz window (16), the constant-volume bomb body wall surface (21) is provided with a constant-volume bomb body wall surface cooling liquid inlet and outlet port and a variable-temperature combustion chamber wall surface cooling liquid micro-channel inlet and outlet port (45), the constant-volume bomb body wall surface (21) is internally provided with a serpentine cooling liquid flow channel one, the cooling liquid inlet and outlet port of the constant-volume bomb body wall surface (21) is connected with the serpentine cooling liquid flow channel one inside the constant-volume bomb body wall surface (21), and the constant-volume bomb body wall surface (21) is provided with a flange plate (S11) connected with the variable-temperature combustion chamber wall.

4. The constant-volume bomb based combustion heat release rate simulation test device according to claim 3, characterized in that, The variable-temperature combustion chamber wall surface (22) adopts a gradient composite structure design, comprising: a heat insulation layer (S1), a micro-channel cooling layer (S2), an embedded gradient heating layer (S4), and a high-temperature radiation layer (S3), the heat insulation layer (S1) is internally filled with aerogel, the high-temperature radiation layer (S3) is composed of high-temperature resistant ceramic material, the embedded gradient heating layer (S4) integrates a heating element array to form at least four independent temperature control zones, the micro-channel cooling layer (S2) is internally provided with a serpentine cooling liquid flow channel two, which is independent of the serpentine cooling liquid flow channel one of the constant-volume bomb body wall surface (21), the temperature of the at least four independent temperature control zones inside the embedded gradient heating layer (S4) is independently fed back by at least four K-type thermocouples, and the variable-temperature combustion chamber wall surface (22) is controlled to realize gradient temperature control from top to bottom by a variable-temperature combustion chamber wall surface control module (6).

5. The constant-volume bomb based combustion heat release rate simulation test device according to claim 4, characterized in that, The constant-volume bomb body wall surface (21) and the variable-temperature combustion chamber wall surface (22) are provided with a flange plate (S11), a corrugated pipe expansion joint (S10), and a force bearing base plate (S12), and the constant-volume bomb body wall surface (21) and the variable-temperature combustion chamber wall surface (22) are pre-tightened to the abutting flange plate (S11) through hydraulic bolts (S13), wherein the corrugated pipe expansion joint (S10) is used to compensate for thermal expansion difference, and the force bearing base plate (S12) bears mechanical stress.

6. The constant-volume bomb based combustion heat release rate rule simulation test device according to claim 4, characterized in that, The test device further comprises: an air supply device, a nitrogen supply device, an exhaust gas recovery device, a wall surface cooling device, a signal acquisition device (54), a fuel wall breaking area and temperature measuring device, a continuous combustion temperature measuring device, and a combustion heat release law analysis device (5). The wall cooling device comprises a constant volume bomb body wall cooling device (27), a constant volume bomb body wall cooling liquid inlet ball valve (24), a constant volume bomb body wall cooling liquid outlet ball valve (26), a variable temperature combustion chamber wall cooling device (29), a variable temperature combustion chamber wall cooling liquid inlet ball valve (30) and a variable temperature combustion chamber wall cooling liquid outlet ball valve (31), the outlet of the constant volume bomb body wall cooling device (27) is connected with the constant volume bomb body wall cooling liquid inlet ball valve (24), the inlet of the constant volume bomb body wall cooling device (27) is connected with the constant volume bomb body wall cooling liquid outlet ball valve (26), the outlet of the variable temperature combustion chamber wall cooling device (29) is connected with the variable temperature combustion chamber wall cooling liquid inlet ball valve (30), and the inlet of the variable temperature combustion chamber wall cooling device (29) is connected with the variable temperature combustion chamber wall cooling liquid outlet ball valve (31).

7. The constant-volume bomb based combustion heat release rate rule simulation test device according to claim 6, characterized in that, The air supply device comprises an air storage tank (3) and a first proportional electromagnetic valve (1), the air storage tank (3) is connected with the first proportional electromagnetic valve (1), the first proportional electromagnetic valve (1) is connected with an air inlet (18), and the first proportional electromagnetic valve (1) is connected with a main controller (33); The nitrogen supply device comprises a nitrogen storage tank (4) and a second proportional electromagnetic valve (2), the nitrogen storage tank (4) is connected with the second proportional electromagnetic valve (2), the second proportional electromagnetic valve (2) is connected with the air inlet (18), and the second proportional electromagnetic valve (2) is connected with the main controller (33); The exhaust gas recovery device comprises an exhaust gas recovery treatment tank (28) and an exhaust valve (25), the exhaust gas recovery treatment tank (28) is connected with the exhaust valve (25), the exhaust valve (25) is connected with an exhaust port (19), and the exhaust valve (25) is connected with the main controller (33).

8. The constant-volume bomb based combustion heat release rate rule simulation test device according to claim 7, characterized in that, The spray penetration distance real-time adjusting device comprises a first high-pressure common rail fuel supply device (34), a second high-pressure common rail fuel supply device (35), a first high-speed electromagnetic valve (36), a second high-speed electromagnetic valve (37), a third high-speed electromagnetic valve (39), a flow collecting pipe (38) and an oil injector (23), the first high-speed electromagnetic valve (36) is connected with a fuel output end of the first high-pressure common rail fuel supply device (34), and the first high-speed electromagnetic valve (36) is connected with the main controller (33); The second high-speed electromagnetic valve (37) is connected with a fuel output end of the second high-pressure common rail fuel supply device (35), the second high-speed electromagnetic valve (37) is connected with the main controller (33), the first high-speed electromagnetic valve (36) is connected with a flow inlet end of the flow collecting pipe (38), the second high-speed electromagnetic valve (37) is connected with another flow inlet end of the flow collecting pipe (38), the third high-speed electromagnetic valve (39) is connected with a flow outlet end of the flow collecting pipe (38) and connected with the main controller (33); The first high-speed electromagnetic valve (36) and the second high-speed electromagnetic valve (37), the first high-pressure common rail fuel supply device (34) and the second high-pressure common rail fuel supply device (35) are in parallel connection.

9. The constant-volume bomb based combustion heat release rate rule simulation test device according to claim 8, characterized in that, The continuous measurement combustion temperature device comprises a high-speed infrared thermal imager (58), a thermocouple array (59), a laser temperature measurement device, the laser temperature measurement device comprising a signal generator (46), a laser controller (47), a first laser generator (48), a second laser generator (49), a laser coupler (50), a laser beam splitter (51), a first collimator (55), a second collimator (52), an etalon (53), and a photoelectric receiver (57). The high-speed infrared thermal imager (58) is connected with the main controller (33) and is arranged at an angle of 45° with the vertical line at the center of the second observation quartz window (16), the signal generator (46) is connected with the main controller (33), the signal generator (46) is connected with the laser controller (47), the laser controller (47) is connected with the first laser generator (48) and the second laser generator (49), and the laser output by the two laser generators is input into the laser beam splitter (51) through the laser coupler (50).

10. The constant-volume bomb based combustion heat release rate rule simulation test device according to claim 9, characterized in that, The laser output by the two laser generators is input into the laser beam splitter (51) through the laser coupler (50), and the following settings are further included: The laser beam splitter (51) divides the laser into two paths, one of which is input into the second collimator (52) and received by the etalon (53), the etalon (53) is connected with the signal acquisition device (54) and is used to calibrate the time axis and the frequency offset of the relative scanning starting point of the laser; the other laser is input into the first collimator (55), passes through the first observation quartz window (13) and the second observation quartz window (16), and is collected by the photoelectric receiver (57), the photoelectric receiver (57) is connected with the signal acquisition device (54) and transmits the spectral data of the combustion development to the signal acquisition device (54); The thermocouple array (59) comprises two symmetrically arranged thermocouples arranged near the lower end of the injection hole of the oil injector (23), which are used to measure the temperature of the initial development of the spray and the quenching zone of the combustion wall, two symmetrically arranged thermocouples at the position of the penetration distance of the spray, which are used to measure the temperature of the development path of the spray, the core region of the combustion and the development of the flame front, and two symmetrically arranged thermocouples at the position of the penetration distance of 90% of the near-wall temperature changing combustion chamber wall (22), which are used to measure the temperature of the development of the near-wall rolling flow path and the broken spray oil.

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