Vaporizing mixing device for liquid fuel

Abstract

The application discloses a vaporization mixing device for liquid fuel, comprising: a mixing cavity configured as a circular cross-section cavity; an atomization part installed at the inlet end of the mixing cavity and configured to allow a first external gas and the liquid fuel to enter the atomization part, so that the liquid fuel is impacted by the first external gas to become atomized fuel, and the atomized fuel is delivered to the inside of the mixing cavity; two first gas inlets, each of which is arranged on one side close to the inlet end of the mixing cavity and extends into the mixing cavity along two tangent directions of the same cross-section of the mixing cavity, and the two first gas inlets are opposite to each other in the gas inlet direction, so that the second external gas enters the mixing cavity through the two first gas inlets and forms a rotational flow; and a heating part sleeved outside the mixing cavity to heat the atomized fuel in the mixing cavity, so that the atomized fuel is vaporized into gaseous fuel, and the mixture of the gaseous fuel, the first external gas and the second external gas is discharged from the outlet end of the mixing cavity.

Description

Technical Field

[0001] At least one embodiment of the present invention relates to the technical field of experimental equipment for hydrocarbon fuel combustion reaction kinetics, and more specifically to a vaporization mixing device for liquid fuels. Background Technology

[0002] Combustion chemistry models contribute to understanding the interaction between chemical reactions and fluid dynamics in combustion kinetics research, and can provide guidance for improving combustion efficiency and identifying and eliminating pollutants. The development of combustion reaction kinetic models relies on experimental data obtained under broad thermodynamic boundary conditions. By combining these models with advanced analytical techniques, researchers can obtain the data needed to validate combustion kinetic models for conventional hydrocarbon fuels, novel low-carbon / zero-carbon fuels, or renewable biomass fuels.

[0003] Fuels used in practical engineering, such as gasoline, diesel, and aviation kerosene, are all high-boiling-point, wide-range fuels. Their energy conversion process involves vaporization followed by gas-phase combustion in the engine cylinder, releasing chemical energy, which is then converted into heat energy and further into mechanical energy for utilization. To study the combustion kinetics of fuels, reaction kinetic experiments are typically conducted at gaseous concentrations. Simultaneously, to avoid the influence of fuel heat absorption / release on experimental conditions and to prevent fuel explosions or combustion from affecting experimental safety, the vaporized fuel must be diluted to ensure uniform mixing with diluent gases such as nitrogen or air, reducing the initial fuel concentration in the experiment.

[0004] Due to limitations in the vaporization and mixing technology of high-boiling-point, wide-range liquid fuels, direct experimental studies on complex multi-component fuels such as aviation kerosene and diesel fuel are scarce in fuel combustion reaction kinetics experiments. In existing technologies, to conduct experimental studies on these complex multi-component fuels, researchers typically use alternative fuel schemes with two to six limited components to replace the actual complex multi-component fuel. For example, Princeton University developed a fuel scheme to replace aviation kerosene Jet A, which includes four hydrocarbons: n-dodecane, isooctane, n-propylbenzene, and 1,3,5-trimethylbenzene. Xi'an Jiaotong University and Shanghai Jiaotong University have respectively developed alternative fuel schemes composed of n-dodecane, isohexadecane, n-butylcyclohexane, toluene, and decahydronaphthalene for use in domestically produced aviation kerosene RP-3. However, using alternative fuel components to study aviation kerosene and diesel fuel has two main drawbacks. First, it is difficult to reproduce the complex component coupling effects and kinetic characteristics of real multi-component fuels. Second, due to limitations in the vaporization technology of large molecules and high-boiling-point components and their rapid mixing with oxidants, the selection of alternative components is also limited, making it impossible to obtain accurate basic experimental data on combustion reaction kinetics. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a vaporization mixing apparatus for liquid fuels, which provides accurate initial condition control for reaction kinetic experiments by conveying a mixture containing gaseous fuels to the outside.

[0006] According to an embodiment of the present invention, a vaporization mixing device for liquid fuel is provided, comprising: a mixing chamber configured as a circular cavity; an atomizing section installed at the inlet end of the mixing chamber, configured to allow a first external gas and liquid fuel to enter the interior of the atomizing section, such that the liquid fuel is impacted by the first external gas to become atomized fuel, and the atomized fuel is delivered into the mixing chamber; two first air inlets, each disposed on one side near the inlet end of the mixing chamber, and extending into the mixing chamber along two mutually parallel tangential directions along the same cross-section of the mixing chamber, and the air inlet directions of the two first air inlets are opposite, such that a second external gas enters the mixing chamber through the two first air inlets and forms a swirling flow to uniformly mix the second external gas with the atomized fuel; and a heating section sleeved outside the mixing chamber to heat the atomized fuel in the mixing chamber, such that the atomized fuel vaporizes into gaseous fuel, and the mixture of gaseous fuel, the first external gas, and the second external gas is discharged from the outlet end of the mixing chamber.

[0007] According to an embodiment of the present invention, the mixing chamber includes an integrally formed and sealed connected first cavity and a second cavity. The inlet end of the mixing chamber is disposed on the first end face of the first cavity, and the outlet end of the mixing chamber is disposed on the second end face of the second cavity. The cross-sections of the first cavity and the second cavity are both circular, and the first cavity is constructed as a cylinder. The diameter of the cross-section of the second cavity gradually decreases along the axis of the second cavity and away from the first cavity.

[0008] According to an embodiment of the present invention, the atomizing unit includes: an atomizing chamber configured as a cylindrical cavity with a conical structure at one end; a fuel conduit extending into the atomizing chamber at one end along the axial direction of the atomizing chamber to allow liquid fuel to flow through the fuel conduit to a position near the outlet of the atomizing chamber; and a second air inlet disposed on the side of the atomizing chamber away from the outlet of the atomizing chamber, and the extension direction of the second air inlet being perpendicular to the axial direction of the atomizing chamber, to fill the atomizing chamber with the first external gas, such that at a position near the outlet of the atomizing chamber, the first external gas impacts the liquid fuel flowing out through the fuel conduit into atomized fuel.

[0009] According to an embodiment of the present invention, the heating unit includes: a first heater, sleeved on the outside of the first cavity, for heating the atomized fuel inside the first cavity, so that the atomized fuel inside the first cavity vaporizes into gaseous fuel; and a second heater, sleeved on the outside of the second cavity, for heat preservation of the mixture of gaseous fuel flowing into the second cavity through the first cavity, the first external gas, and the second external gas.

[0010] According to an embodiment of the present invention, the first heater includes: multiple sets of bearings, which are sequentially sleeved on the outside of the first cavity along the axial direction of the first cavity, each set of bearings including two bearings sleeved opposite to each other on the outside of the first cavity; and multiple sets of heating tubes, each bearing having a set of heating tubes for heating the atomized fuel inside the first cavity, so that the atomized fuel inside the first cavity vaporizes into gaseous fuel.

[0011] According to an embodiment of the present invention, the first heater is a first heating band, which covers the outside of the first cavity to heat the atomized fuel inside the first cavity, so that the atomized fuel inside the first cavity vaporizes into gaseous fuel.

[0012] According to an embodiment of the present invention, the first heater further includes: two thermocouples, respectively disposed at both ends of the extension direction of the second cavity, and both thermocouples extending into the second cavity in a direction perpendicular to the axis of the second cavity, to detect the temperature of the mixture of gaseous fuel, the first external gas, and the second external gas flowing into the second cavity through the first cavity; a temperature controller, respectively connected to the thermocouples near the first cavity and the plurality of heating tubes, to control the heating of the plurality of heating tubes or to stop heating according to the temperature of the mixture in the second cavity; and a temperature meter, connected to the thermocouples away from the first cavity, to display the temperature of the mixture in the second cavity.

[0013] According to an embodiment of the present invention, the second heater is a second heating belt, which covers the outside of the second cavity to keep the mixture of gaseous fuel, the first external gas and the second external gas in the second cavity warm.

[0014] According to an embodiment of the present invention, the second cavity is further provided with a gas passage interface, which is suitable for obtaining a mixture of gaseous fuel, a first external gas and a second external gas in the second cavity, so as to detect the components in the mixture in the second cavity.

[0015] According to an embodiment of the present invention, the diameter of the cross section of the end of the second cavity away from the first cavity is D1, the value range of the length L1 of the second cavity in the axial direction is 2D1<L1<5D1, and the value range of the pipe diameter D2 of the first cavity is 2D1<D2<5D1.

[0016] With the vaporization and mixing device for liquid fuel according to the above embodiments of the present invention, by providing the vaporization and mixing device including a mixing chamber, an atomization part, and a heating part, the liquid fuel is formed into atomized fuel under the action of the atomization part and delivered to the mixing chamber, the second external gas enters the mixing chamber through the two first gas inlets respectively and forms a swirling flow, so that the second external gas and the atomized fuel are uniformly mixed, and heated by the heating part, so that the atomized fuel is vaporized into gaseous fuel, to deliver the mixture containing the gaseous fuel to the outside. By precisely controlling the contents of the liquid fuel, the first external gas and the second external gas that enter the vaporization and mixing device, the concentration of the gaseous fuel output by the vaporization and mixing device can be determined, which provides accurate initial condition control for the reaction kinetics experiment, and can be used in the basic combustion reaction kinetics experimental platform for real and complex multi-component liquid fuels, so as to obtain accurate basic experimental data of combustion reaction kinetic characteristics. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the working principle of the vaporization and mixing device for liquid fuel according to the present invention;

[0018] Figure 2 is a schematic diagram of the principle of the atomization part in the vaporization and mixing device for liquid fuel according to the present invention;

[0019] Figure 3 is a three-dimensional schematic diagram of the mixing chamber in the vaporization and mixing device for liquid fuel according to the present invention;

[0020] Figure 4 is a schematic diagram of the principle that the second external gas forms a swirling airflow inside the mixing chamber;

[0021] Figure 5 is a schematic diagram of the connection between the first heater and the temperature controller according to one embodiment; and

[0022] Figure 6 is a schematic diagram of the assembly among the first heater, the second heater, the thermocouple, the temperature controller and the mixing chamber according to another embodiment.

[0023] 1 - Mixing chamber;

[0024] 11 - Inlet end;

[0025] 12 - Outlet end;

[0026] 13 - First cavity; 131 - First end face;

[0027] 14-Second cavity; 141-Second end face; 142-Gas passage interface;

[0028] IB231796

[0029] 2-Atomizing section;

[0030] 21-Atomizing chamber; 211-Outlet;

[0031] 22-Fuel conduit;

[0032] 23 - Second air intake;

[0033] 3-First air intake;

[0034] 4-Heating section;

[0035] 41-First heater; 411-Bearing bush; 412-Heating tube; 413-First heating belt; 414-Thermocouple; 415-Temperature controller; 416-Temperature gauge;

[0036] 42-Second heater; 421-Second heating belt. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] According to one aspect of the invention, a vaporization mixing device for liquid fuel is provided, comprising: a mixing chamber configured as a circular cavity; an atomizing section installed at the inlet end of the mixing chamber, configured to allow a first external gas and liquid fuel to enter the interior of the atomizing section, such that the liquid fuel is impacted by the first external gas to become atomized fuel, and the atomized fuel is delivered into the mixing chamber; two first air inlets, each disposed on one side near the inlet end of the mixing chamber, and extending into the mixing chamber along two mutually parallel tangential directions of the same cross-section of the mixing chamber, and the air inlet directions of the two first air inlets are opposite, such that a second external gas enters the mixing chamber through the two first air inlets and forms a swirling flow to uniformly mix the second external gas with the atomized fuel; and a heating section sleeved on the outside of the mixing chamber to heat the atomized fuel inside the mixing chamber, such that the atomized fuel vaporizes into gaseous fuel, and the mixture of gaseous fuel, the first external gas, and the second external gas is discharged from the outlet end of the mixing chamber.

[0039] Figure 1 This is a schematic diagram illustrating the working principle of the vaporization and mixing device for liquid fuel of the present invention. Figure 4 This is a schematic diagram illustrating the principle of a second external gas forming a swirling airflow inside the mixing chamber.

[0040] According to an exemplary embodiment of the present invention, please refer to Figure 1 as well as Figure 4 A vaporization mixing device for liquid fuel is provided, comprising a mixing chamber 1, an atomizing section 2, two first air inlets 3, and a heating section 4. The mixing chamber 1 is configured as a circular cavity. The atomizing section 2 is installed at the inlet end 11 of the mixing chamber 1 and is configured to allow a first external gas and liquid fuel to enter the atomizing section 2, causing the liquid fuel to be atomized by the first external gas and delivered into the mixing chamber 1. The two first air inlets 3 are both located on one side near the inlet end 11 of the mixing chamber 1 and extend into the mixing chamber 1 along two parallel tangential directions on the same cross-section. The air intake directions of the two first air inlets 3 are opposite, allowing a second external gas to enter the mixing chamber 1 through the two first air inlets 3 and form a swirling flow, thereby uniformly mixing the second external gas with the atomized fuel. The heating unit 4 is installed outside the mixing chamber 1 to heat the atomized fuel inside the mixing chamber 1, so that the atomized fuel is vaporized into gaseous fuel, and the mixture of gaseous fuel, first external gas and second external gas is discharged from the outlet end 12 of the mixing chamber 1.

[0041] In this embodiment, a vaporization mixing device including a mixing chamber 1, an atomizing section 2, and a heating section 4 is provided. Liquid fuel is atomized by the atomizing section 2 and delivered to the mixing chamber 1. A second external gas enters the mixing chamber 1 through two first air inlets 3 and forms a swirling flow, uniformly mixing the second external gas with the atomized fuel. The mixture is then heated by the heating section 4, causing the atomized fuel to vaporize into gaseous fuel, which is then delivered externally as a mixture containing gaseous fuel. By precisely controlling the content of liquid fuel, the first external gas, and the second external gas entering the vaporization mixing device, the concentration of gaseous fuel output by the vaporization mixing device can be determined, providing accurate initial condition control for reaction kinetic experiments. This provides a basic combustion reaction kinetic experimental platform for real, complex, multi-component liquid fuels, enabling the acquisition of accurate basic experimental data on combustion reaction kinetic characteristics.

[0042] In some exemplary embodiments, the second external gas forms two centrally symmetrical dilution gases through two first air inlets 3, enters the mixing chamber 1 along the axis perpendicular to the mixing chamber 1, and quickly mixes with the atomized fuel in the mixing chamber 1, forming a swirling flow to accelerate the mixing speed, so as to ensure that the gaseous fuel vaporized by the heating part 4 and the second external gas are uniformly mixed before leaving the mixing chamber 1.

[0043] It should be noted that, in this embodiment, the first external gas is an inert gas such as nitrogen, argon, or helium, suitable for atomizing liquid fuel entering the atomizing section 2. Furthermore, the first external gas may also contain oxygen and reaction gases for the combustion reaction kinetics experimental platform to facilitate subsequent combustion reactions. The second external gas is an inert gas such as nitrogen, argon, or helium.

[0044] Furthermore, the atomizing unit 2 is connected to the mixing chamber 1 via a vacuum connector, and the threaded portion must be sealed with heat-resistant raw rubber tape. The two first air inlets 3 are threaded interfaces connected to external air circuits, and the threaded portions must also be sealed with heat-resistant raw rubber tape, which can be made of polytetrafluoroethylene (PTFE). The outlet end 12 of the mixing chamber 1 is integrally welded with a flange for connecting to external equipment.

[0045] Figure 3 This is a three-dimensional schematic diagram of the mixing chamber in the vaporization mixing device for liquid fuel of the present invention.

[0046] In some exemplary embodiments, reference is made to Figure 1 as well as Figure 3 The mixing chamber 1 includes an integrally formed and sealed connected first cavity 13 and a second cavity 14. The inlet end 11 of the mixing chamber 1 is located on the first end face 131 of the first cavity 13, and the outlet end 12 of the mixing chamber 1 is located on the second end face 141 of the second cavity 14. Both the first cavity 13 and the second cavity 14 have circular cross-sections, with the first cavity 13 constructed as a cylinder. The diameter of the cross-section of the second cavity 14 gradually decreases along its axis away from the first cavity 13.

[0047] With the above configuration, as the mixture containing gaseous fuel, a first external gas, and a second external gas formed in the first cavity 13 flows through the second cavity 14, the diameter of the cross-section of the second cavity 14 gradually decreases with the flow direction of the mixture, thereby gradually increasing the flow velocity of the mixture in the second cavity 14 to promote further mixing of the mixture.

[0048] Figure 2 This is a schematic diagram of the atomizing section in the vaporization and mixing device for liquid fuel of the present invention.

[0049] In some exemplary embodiments, reference is made to Figure 2The atomizing section 2 includes an atomizing chamber 21, a fuel conduit 22, and a second air inlet 23. The atomizing chamber 21 is configured as a cylindrical cavity with a conical structure at one end. One end of the fuel conduit 22 extends into the atomizing chamber 21 along its axial direction, allowing liquid fuel to flow through the fuel conduit 22 to a position near the outlet 211 of the atomizing chamber 21. The second air inlet 23 is located on the side of the atomizing chamber 21 away from the outlet 211, and the extension direction of the second air inlet 23 is perpendicular to the axial direction of the atomizing chamber 21, so as to fill the atomizing chamber 21 with a first external gas, such that at a position near the outlet 211 of the atomizing chamber 21, the first external gas impacts the liquid fuel flowing out through the fuel conduit 22 to atomize the fuel.

[0050] With the above configuration, liquid fuel flows through fuel conduit 22 to the outlet 211 of the cone-shaped structure of atomizing chamber 21. The flow rate and pressure of the liquid fuel increase sharply, and it collides with the first external gas at the outlet 211 of atomizing chamber 21 to form atomized fuel.

[0051] It should be noted that, in this embodiment, the outer diameter of the atomizing chamber 21 matches the inlet end 11 of the mixing chamber 1. The reference range for the outer diameter of the atomizing chamber 21 is 5mm-7mm, preferably 5.65mm, 6mm, or 6.35mm. The diameter of the fuel conduit 22 is no greater than 0.5mm. The diameter of the outlet 211 of the atomizing chamber 21 is no greater than 1mm. The atomizing part 2 is made of quartz material to adapt to the high temperature of the mixing chamber 1 and to overcome the influence of thermal stress caused by the temperature difference between the two ends of the atomizing part 2 near and away from the mixing chamber 1. The temperature of the mixing chamber 1 can reach up to 500℃.

[0052] In some exemplary embodiments, reference is made to Figure 1 The heating unit 4 includes a first heater 41 and a second heater 42. The first heater 41 is fitted outside the first cavity 13 to heat the atomized fuel inside the first cavity 13, causing the atomized fuel inside the first cavity 13 to vaporize into gaseous fuel. The second heater 42 is fitted outside the second cavity 14 to keep the mixture of gaseous fuel, first external gas, and second external gas flowing into the second cavity 14 from the first cavity 13 at a constant temperature.

[0053] Figure 5 This is a schematic diagram of the connection between the first heater and the temperature controller in one embodiment.

[0054] In some exemplary embodiments, reference is made to Figure 1 as well as Figure 5The first heater 41 includes multiple sets of bearings 411 and multiple sets of heating tubes 412. The multiple sets of bearings 411 are sequentially sleeved on the outside of the first cavity 13 along its axial direction. Each set of bearings 411 includes two bearings 411 opposite each other on the outside of the first cavity 13. Each bearing 411 is provided with a set of heating tubes 412 to heat the atomized fuel inside the first cavity 13, causing the atomized fuel inside the first cavity 13 to vaporize into gaseous fuel.

[0055] The first heater 41 in the above embodiment is suitable for liquid fuels containing components with a boiling point higher than 150°C. To accommodate the boiling point characteristics of this liquid fuel, the mixing chamber 1 needs to be able to heat the mixture containing atomized fuel inside the mixing chamber 1 to above 400°C. Therefore, the bearing 411 in this embodiment is made of cast iron, whose melting point is between 1148-1400°C, fully meeting the heating requirements of the mixing chamber 1.

[0056] In some exemplary embodiments, the bearing 411 can be tightly fitted to the mixing chamber 1, so that the first heater 41 is tightly fitted to the outside of the mixing chamber 1, thereby improving the heating effect of the first heater 41 on the mixture inside the mixing chamber 1. Preferably, the first heater 41 includes two sets of bearings 411, and the two bearings 411 in each set are fastened together by bolts. The heating tube 412 adopts a U-shaped structure and is cast inside the bearing 411, integrally cast with the bearing 411. The positive and negative terminals of the heating tube 412 are connected by wires, and its maximum heating current is not less than 20A, its maximum heating power is not less than 4KW, and its surface temperature is not less than 500℃.

[0057] In addition, to reduce heat loss to the environment, improve heating efficiency, and ensure the safety and health of laboratory personnel, the surface of the 411 bearing bush should be covered with asbestos or fiberglass insulation tape with a thickness of not less than 5mm in actual use. The surface of the insulation tape should be fully covered with aluminum foil to avoid health risks caused by the volatilization of chemical fibers in the insulation material.

[0058] Figure 6 This is a schematic diagram of the assembly between the first heater, the second heater, the thermocouple, the temperature controller, and the mixing chamber in another embodiment.

[0059] In some exemplary embodiments, reference is made to Figure 6 The first heater 41 is a first heating band 413, which covers the outside of the first cavity 13 to heat the atomized fuel inside the first cavity 13, so that the atomized fuel inside the first cavity 13 is vaporized into gaseous fuel.

[0060] The first heater 41 in the above embodiment is suitable for liquid fuels where the boiling points of all components are below 150°C. The first heating band 413 must be wrapped in parallel without overlap to avoid safety hazards and component damage caused by overheating of overlapping portions. The first heating band 413 uses glass fiber to wrap a nickel-chromium alloy heating element, with a maximum heating current of not less than 10A, a maximum heating power of not less than 2kW, a width between 2cm and 5cm, preferably 3cm or 4cm, and a maximum surface temperature of not less than 250°C.

[0061] In some exemplary embodiments, reference is made to Figure 1 The first heater 41 also includes two thermocouples 414, a temperature controller 415, and a temperature gauge 416. The two thermocouples 414 are respectively disposed at both ends of the extension direction of the second cavity 14, and both thermocouples 414 extend into the second cavity 14 in a direction perpendicular to the axis of the second cavity 14 to detect the temperature of the mixture of gaseous fuel, first external gas, and second external gas flowing into the second cavity 14 from the first cavity 13. The temperature controller 415 is connected to the thermocouples 414 near the first cavity 13 and to multiple sets of heating tubes 412, controlling the heating or stopping of the multiple sets of heating tubes 412 according to the temperature of the mixture in the second cavity 14. The temperature gauge 416 is connected to the thermocouples 414 away from the first cavity 13 to display the temperature of the mixture in the second cavity 14.

[0062] It should be noted that in this embodiment, the thermocouple 414 near the first cavity 13 converts the measured temperature of the mixture in the second cavity 14 into an electrical signal and transmits it to the temperature controller 415. The temperature controller 415 consists of a power supply, a digital display temperature controller, a contact relay, a heating switch, and indicator lights, supporting both manual and automatic control modes. In automatic control mode, the digital display temperature controller, based on the PID control principle, controls the temperature based on the difference between the measured temperature of the thermocouple 414 near the first cavity 13 and the set temperature. When the measured temperature is lower than the set temperature, the contact relay automatically engages, energizing the heating element 412 to raise the temperature. When the measured temperature is equal to or higher than the set temperature, the contact relay automatically disengages, de-energizing the heating element 412 and stopping heating. The indicator lights indicate the power supply status and heating status.

[0063] Furthermore, the connection between the two thermocouples 414 and the mixing chamber 1 must be sealed with heat-resistant raw rubber tape.

[0064] In some exemplary embodiments, reference is made to Figure 6 The second heater 42 is a second heating band 421, which covers the outside of the second cavity 14 to keep the mixture of gaseous fuel, first external gas and second external gas in the second cavity 14 warm.

[0065] It should be noted that the wrapping of the second heating belt 421 must follow the principle of parallel non-overlapping wrapping, so as to avoid safety hazards and component damage risks caused by overheating of the overlapping part. The second heating belt 421 uses a nickel-chromium alloy heating element wrapped in glass fiber.

[0066] In some exemplary embodiments, with reference to Figure 3 , the second cavity 14 is further provided with a gas path interface 142, which is suitable for obtaining the mixture of the gaseous fuel, the first external gas and the second external gas in the second cavity 14, so as to detect the components in the mixture in the second cavity 14.

[0067] In this embodiment, the gas path interface 142 is connected to an external gas path, which is suitable for bypassing the external device connected to the outlet end 12 of the mixing chamber 1, directly connecting the gas path interface 142 to the detection device through the external gas path, so as to realize direct detection of the components of the mixture in the second cavity 14.

[0068] In some exemplary embodiments, with reference to Figure 3 , the diameter of the cross section of the end of the second cavity 14 away from the first cavity 13 is D1, the value range of the axial length L1 of the second cavity 14 is 2D1<L1<5D1, and the value range of the pipe diameter D2 of the first cavity 13 is 2D1<D2<5D1.

[0069] It should be noted that, in this embodiment, the diameter of the cross section of the second cavity 14 adopts a linear variable diameter. The first cavity 13 and the second cavity 14 are made of 316 stainless steel to better adapt to the thermal stress caused by high temperature. The wall thickness of the first cavity 13 and the second cavity 14 is 2mm-5mm, preferably 3mm and 4mm.

[0070] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vaporization mixing device for liquid fuels, suitable for a basic combustion reaction kinetics experimental platform, comprising: A mixing chamber (1) is constructed as a cavity with a circular cross-section. The mixing chamber (1) includes an integrally formed and sealed first cavity (13) and a second cavity (14). The inlet end (11) of the mixing chamber (1) is disposed on the first end face (131) of the first cavity (13), and the outlet end (12) of the mixing chamber (1) is disposed on the second end face (141) of the second cavity (14). The cross-sections of the first cavity (13) and the second cavity (14) are both circular. The first cavity (13) is constructed as a cylinder. The diameter of the cross-section of the second cavity (14) gradually decreases along the axis of the second cavity (14) and away from the first cavity (13). An atomizing section (2), installed at the inlet end (11) of the mixing chamber (1), is configured to allow a first external gas and liquid fuel to enter the interior of the atomizing section (2), so that the liquid fuel is impacted by the first external gas to become atomized fuel, and the atomized fuel is delivered into the mixing chamber (1). The atomizing section (2) includes: The atomizing chamber (21) is constructed as a cylindrical cavity with a conical structure at one end; A fuel conduit (22), one end of which extends into the atomizing chamber (21) along its axial direction, allows liquid fuel to flow through the fuel conduit (22) to a position near the outlet (211) of the atomizing chamber (21); and The second air inlet (23) is located on the side of the atomizing chamber (21) away from the outlet (211) of the atomizing chamber (21), and the extension direction of the second air inlet (23) is perpendicular to the axial direction of the atomizing chamber (21) to fill the atomizing chamber (21) with the first external gas, so that at the position near the outlet (211) of the atomizing chamber (21), the first external gas will impact the liquid fuel flowing out through the fuel conduit (22) into atomized fuel; Two first air inlets (3) are both located on one side near the inlet end (11) of the mixing chamber (1), and extend into the mixing chamber (1) along two mutually parallel tangential directions on the same cross-section of the mixing chamber (1). The air intake directions of the two first air inlets (3) are opposite, so that the second external gas enters the mixing chamber (1) through the two first air inlets (3) and forms a swirling flow, so as to mix the second external gas with the atomized fuel evenly; and A heating unit (4) is fitted outside the mixing chamber (1) to heat the atomized fuel inside the mixing chamber (1), causing the atomized fuel to vaporize into gaseous fuel, and discharging the mixture of gaseous fuel, the first external gas, and the second external gas from the outlet end (12) of the mixing chamber (1). The heating unit (4) includes: A first heater (41) is fitted outside the first cavity (13) to heat the atomized fuel inside the first cavity (13), causing the atomized fuel inside the first cavity (13) to vaporize into gaseous fuel; and The second heater (42) is fitted outside the second cavity (14) to keep the mixture of gaseous fuel, the first external gas and the second external gas flowing into the second cavity (14) through the first cavity (13) insulated.

2. The vaporization and mixing apparatus for liquid fuel according to claim 1, wherein, The first heater (41) includes: Multiple sets of bearing bushes (411) are sequentially sleeved on the outside of the first cavity (13) along the axial direction of the first cavity (13), and each set of bearing bushes (411) includes two bearing bushes (411) that are oppositely sleeved on the outside of the first cavity (13); and Multiple sets of heating tubes (412) are provided on each of the bearings (411) to heat the atomized fuel inside the first cavity (13) so that the atomized fuel inside the first cavity (13) is vaporized into gaseous fuel.

3. The vaporization mixing apparatus for liquid fuel according to claim 1, wherein, The first heater (41) is a first heating band (413), which covers the outside of the first cavity (13) to heat the atomized fuel inside the first cavity (13) so that the atomized fuel inside the first cavity (13) is vaporized into gaseous fuel.

4. The vaporization mixing apparatus for liquid fuel according to claim 2, wherein, The first heater (41) further includes: Two thermocouples (414) are respectively disposed at both ends of the extension direction of the second cavity (14), and both thermocouples (414) extend into the second cavity (14) in a direction perpendicular to the axis of the second cavity (14) to detect the temperature of the mixture of gaseous fuel, the first external gas and the second external gas flowing into the second cavity (14) through the first cavity (13); A temperature controller (415) is connected to the thermocouple (414) near the first cavity (13) and to multiple sets of heating tubes (412), respectively, and controls the heating tubes (412) to heat or stop heating according to the temperature of the mixture in the second cavity (14); and A thermometer (416) is connected to the thermocouple (414) located away from the first cavity (13) to display the temperature of the mixture in the second cavity (14).

5. The vaporization mixing apparatus for liquid fuel according to claim 1, wherein, The second heater (42) is a second heating band (421), which covers the outside of the second cavity (14) to keep the mixture of gaseous fuel, the first external gas and the second external gas in the second cavity (14) warm.

6. The vaporization mixing apparatus for liquid fuel according to claim 1, wherein, The second cavity (14) is also provided with a gas passage interface (142), which is suitable for obtaining a mixture of gaseous fuel, first external gas and second external gas in the second cavity (14) to detect the components in the mixture in the second cavity (14).

7. The vaporization mixing apparatus for liquid fuel according to claim 1, wherein, The diameter of the cross section of the second cavity (14) at the end away from the first cavity (13) is D1, the value range of the length L1 of the second cavity (14) in the axial direction is 2D1<L1<5D1, and the value range of the pipe diameter D2 of the first cavity (13) is 2D1<D2<5D1.

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