A system for visualizing spray combustion and a method of operation thereof

Abstract

The application discloses a system for realizing spray combustion visualization and a working method thereof, and belongs to the field of combustion visualization technology.The system comprises a constant volume combustion bomb, a gas supply system, an exhaust system, a fuel supply system, an ECU electric control unit and a background condition control cabinet, a high-speed camera is arranged outside a window of the constant volume combustion bomb, the gas supply system and the exhaust system are connected with the constant volume combustion bomb through a gas pipeline, an upper portion of the constant volume combustion bomb is connected with an oil sprayer of the fuel supply system, the fuel supply system and the high-speed camera are respectively connected with the ECU electric control unit in signal connection, meanwhile, the constant volume combustion bomb is additionally provided with a thermocouple and a signal acquisition system, and the thermocouple and the signal acquisition system are respectively connected with the background condition control cabinet in signal connection.The temperature and pressure conditions of the constant volume combustion bomb can be remotely regulated and controlled by the background condition control cabinet, the oil injection and combustion are controlled by a control computer and the ECU electric control unit, and an oil pressure control valve and a fuel filter are arranged in an oil supply pipeline, so that the experimental safety and the experimental efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diesel engine combustion visualization, in particular to a system for realizing spray combustion visualization and a working method thereof. BACKGROUND

[0002] Diesel engine is a kind of engineering machinery which is widely used, but its power is significantly affected under special working conditions such as high mountain, underground and other oxygen-deficient and high EGR rate working environment. With the change of working environment, the traditional diesel engine is no longer applicable. In order to adapt to the change of working environment, there are currently diesel engines that can be used in special environmental gases different from air. However, these diesel engines often cannot work stably, because the combustion characteristics of diesel in different environmental gases are very different.

[0003] Constant volume combustion bomb can simulate the real combustion conditions in the cylinder of diesel engine, and has always been a main tool for related research as an experimental equipment. Combustion visualization test is one of the important basic methods for studying combustion process, and visualization refers to recording part of the parameters in the combustion process that cannot be directly observed in the form of pictures or videos and analyzing and researching. SUMMARY

[0004] In order to overcome the defects of the prior art, the purpose of the present application is to provide a system for realizing spray combustion visualization and a working method thereof, so as to study the ignition and combustion process of diesel in various gas environments.

[0005] To this end, the present application provides a system for realizing spray combustion visualization, which comprises a constant volume combustion bomb, a gas supply system, an exhaust system, a fuel supply system, an ECU electric control unit and a background condition control cabinet, a high-speed camera is arranged outside the window of the constant volume combustion bomb; the gas supply system and the exhaust system are connected with the constant volume combustion bomb through a gas pipeline; the upper part of the constant volume combustion bomb is connected with the fuel injector of the fuel supply system; the fuel supply system and the high-speed camera are respectively signal connected with the ECU electric control unit; meanwhile, the constant volume combustion bomb is also provided with a thermocouple and a signal acquisition system, and the thermocouple and the signal acquisition system are respectively signal connected with the background condition control cabinet.

[0006] Further, a lens with fluorescent material is arranged between the high-speed camera and the window, and a light source is arranged directly below the lens, and the light emitted by the light source is reflected into the window through the lens.

[0007] Further, the fuel supply system comprises an oil tank, an oil pump, a fuel filter, a pressure control valve, a high-pressure oil rail and a fuel injector which are connected in sequence; an oil pressure sensor is arranged on the high-pressure oil rail, and the oil pump, the pressure control valve, the oil pressure sensor and the fuel injector are respectively signal connected with the ECU electric control unit through data lines.

[0008] Further, the gas supply system comprises a gas cylinder, a gas valve, a gas agitator and a gas compressor connected in sequence; the gas compressor is connected to the inner wall of the constant volume bomb through a gas pipe.

[0009] Further, the gas supply system is provided with a plurality of gas cylinders, each of which is connected with a gas valve, and different gas cylinders are filled with different types of gas.

[0010] Further, the water cooling system comprises a water pump and a water tank, the water pump is connected to the upper end of the constant volume bomb through a water pipe, and the lower end of the constant volume bomb is connected to the water tank through a backwater pipe; meanwhile, the water pump is signal connected with the background condition control cabinet.

[0011] Further, the signal acquisition system is a temperature and pressure sensor, which is connected to the inner cavity of the constant volume bomb and signal connected with the background condition control cabinet.

[0012] Further, the exhaust system is a vacuum pump, and the constant volume bomb is also connected to the vacuum pump through a gas pipe.

[0013] The application further provides a working method of the system for realizing visualization of spray combustion, which comprises the following steps:

[0014] S1: background condition control cabinet, thermocouple, gas temperature and pressure sensor, water pump, water tank, gas cylinder, gas valve, gas agitator, gas compressor and vacuum pump are used to create the required background gas and gas conditions in the constant volume bomb;

[0015] S2: after the background conditions meet the requirements, the control computer, ECU, oil tank, oil pump, fuel filter, pressure control valve, high-pressure oil rail and oil pressure sensor are used to control the fuel injection to meet the required conditions, and the fuel is injected into the constant volume bomb through the fuel injector;

[0016] S3: the combustion process is observed through the window, the excitation light source and the lens with fluorescent material are used to enhance the imaging effect, and the high-speed camera is used to record;

[0017] S4: after the combustion is completed, the combustion product collector collects the combustion products.

[0018] Further, the excitation light source is used to excite the fluorescent material on the lens with fluorescent material, so that the fluorescent material is in an excited state, and the imaging effect is enhanced.

[0019] The patent researches a light source excitation system, and designs a system for realizing spray combustion visualization based on a constant volume combustion bomb.

[0020] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. In the drawings:

[0022] Figure 1 The structure schematic view of the system for realizing spray combustion visualization of the present application;

[0023] Figure 2 The step flow chart of the working method of the system for realizing spray combustion visualization of the present application;

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, background condition control cabinet; 2, control computer; 3, ECU electric control unit; 4, thermocouple; 5, temperature and pressure sensor; 6, water pump; 7, water tank; 8, constant volume combustion bomb; 9, gas cylinder; 10, gas valve; 11, gas agitator; 12, gas compressor; 13, vacuum pump; 14, oil tank; 15, fuel filter; 16, oil pump; 17, pressure control valve; 18, high pressure oil rail; 19, oil pressure sensor; 20, oil sprayer; 21, combustion product collector; 22, viewing window; 23, excitation light source; 24, lens; 25, high speed camera. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] As Figure 1As shown, the system for realizing spray combustion visualization of the present application comprises: a background condition control cabinet 1, a control computer 2, an ECU electric control unit 3, a thermocouple 4, a gas temperature and pressure sensor 5, a water pump 6, a water tank 7, a constant volume combustion bomb 8, a gas cylinder 9, a gas valve 10, a gas agitator 11, a gas compressor 12, a vacuum pump 13, an oil tank 14, an oil pump 16, a fuel filter 15, a pressure control valve 17, a high-pressure oil rail 18, an oil pressure sensor 19, an oil injector 20, a combustion product collector 21, a viewing window 22, an excitation light source 23, a lens with fluorescent material 24, and a high-speed camera 25.

[0028] Specifically, the gas cylinder 9, the gas valve 10, the gas agitator 11, and the gas compressor 12 are connected in sequence to form a gas supply system, and the gas compressor 12 is further connected to the inner wall of the constant volume combustion bomb 8 through a gas pipe. A plurality of gas cylinders 9 are arranged on the gas supply system, each of which is connected with a gas valve 10, and different gas cylinders 9 are filled with different types of gas. The gas cylinder 9 is selected according to the required environmental gas, and the opening of the gas valve 10 is adjusted according to the volume fraction or concentration of the required environmental gas. Different gases will be stirred into uniform mixed gas in the gas agitator 11. Different background gases can be configured by replacing different gas cylinders 9 and adjusting the gas valve 10 through the gas agitator 11.

[0029] In addition, the constant volume combustion bomb 8 is further connected with the vacuum pump 13 through a gas pipe to form an exhaust system. Before the experiment, the vacuum pump 13 is used to evacuate the combustion chamber of the constant volume combustion bomb.

[0030] The temperature and pressure sensor 5 is in communication with the inner cavity of the constant volume combustion bomb 8, and the temperature and pressure sensor 5 is in signal connection with the background condition control cabinet 1. The background condition control cabinet 1 sets the target temperature and target pressure of the constant volume combustion bomb 8, and the temperature and pressure sensor 5 in the bomb body transmits the temperature signal to the background condition control cabinet 1. The background condition control cabinet 1 adjusts the heating intensity of the thermocouple 4 and the power of the gas compressor 12 to raise the temperature and pressure in the bomb body by calculating the difference between the target temperature and the actual temperature.

[0031] In order to prevent the temperature from rising too fast and the temperature from being too high during the combustion process, a gradient air inlet heating method is adopted, and a water cooling system will participate in the work throughout the process. The water cooling system comprises a water pump 6 and a water tank 7. The water pump 6 is in communication with the upper end of the constant volume combustion bomb 8 through a water pipe, and the water pump 6 is in signal connection with the background condition control cabinet 1. In addition, the lower end of the constant volume combustion bomb 8 is connected with the water tank 7 through a return water pipe. The background condition control cabinet 1 controls the flow of the water pump 6, so that the cooling water from the water tank 7 enters the inner wall of the constant volume combustion bomb 8 through the water supply pipe, and then returns to the water tank 7 through the return water pipe.

[0032] The background condition control cabinet 1 controls the heating opening of the thermocouple, the power of the gas compressor 12 and the flow of the water pump 6, ensures that the gas in the constant volume combustion bomb 8 changes stably and is kept within a certain range, and ensures the safety of the test.

[0033] The heating intensity of the thermocouple 4 and the power of the gas compressor 12 gradually decrease as the temperature and pressure in the bomb body approach the target value. After the actual temperature reaches the target temperature and stabilizes, the heating intensity of the thermocouple 4 and the flow of the water pump 6 remain unchanged, the gas compressor stops working and the gas valve is closed, and the experiment can start.

[0034] Two windows 22 are provided on the constant volume combustion bomb 8, a high-speed camera 25 is opposite to the windows 22, and a lens 24 with fluorescent material is arranged between the high-speed camera 25 and the windows 22. A light source 23 is arranged below the lens 24, and the light emitted by the light source 23 is reflected into the window 22 through the lens 24. The light source 23 irradiates the lens 24 with fluorescent material, so that the fluorescent material is in an excited state. In addition, replacing different fluorescent materials can enhance the luminescence imaging of different substances.

[0035] After combustion, the light emitted by the flame is projected on the lens 24 with fluorescent material through the window 22. The fluorescent material that is excited in advance will emit stronger light under the irradiation of the flame, and the area not irradiated by the flame will remain in a critical state between unexcited and excited. The luminescence of the fluorescent material on the lens is captured and recorded by the high-speed camera 25. After the combustion is completed, the combustion products are collected by the combustion product collector 21 arranged inside the constant volume combustion bomb 8 for subsequent test analysis.

[0036] The constant volume combustion bomb 8 is also connected with a fuel supply system, which includes an oil tank 14, an oil pump 16, a fuel filter 15, a pressure control valve 17, a high-pressure oil rail 18 and an oil injector 20 connected in sequence. The oil injector 20 is in communication with the inner cavity of the constant volume combustion bomb 8, and the high-pressure oil rail 18 is provided with an oil pressure sensor 19. Meanwhile, the oil pump 16, the pressure control valve 17, the oil pressure sensor 19 and the oil injector 20 are respectively connected with the ECU electronic control unit 3 through data lines, and the ECU electronic control unit 3 is connected with a control computer. In addition, the ECU electronic control unit 3 is also connected with the high-speed camera 25.

[0037] The fuel enters the high-pressure oil rail 18 after passing through the fuel filter 15, ensuring the quality of the fuel. The fuel pressure is monitored in real time by the oil pressure sensor 19, and the ECU electronic control unit 3 controls the pressure control valve 17 to ensure the stability of the oil pressure in the high-pressure oil rail, thereby improving the test efficiency.

[0038] The oil injector 20 can provide stable fuel injection pressure within a specified fuel injection duration, the control computer 2 sets fuel injection parameters and issues fuel injection instructions to the ECU 3, the control computer 2 sets fuel injection pressure and duration, and inputs instructions to the ECU 3, the ECU 3 controls the flow of the oil pump 16, so that the fuel enters the high-pressure oil rail 18 through the fuel filter 15, and is feedback adjusted through the oil pressure sensor 19, the ECU 3 controls the maximum limit oil pressure of the pressure control valve 17 to prevent the oil pressure in the high-pressure oil rail 18 from being too high. After the oil pressure reaches the set value, the control computer 2 issues a fuel injection instruction, and the ECU 3 controls the oil injector 20 to complete the fuel injection. At the same time of fuel injection, the ECU 3 controls the high-speed camera 25 to start recording.

[0039] As shown in Figure 2 The application also provides a working method of the spray combustion process visualization system, and the steps are as follows:

[0040] S1: The background condition control cabinet 1, thermocouple 4, gas temperature and pressure sensor 5, water pump 6, water tank 7, gas cylinder 9, gas valve 10, gas stirrer 11, gas compressor 12 and vacuum pump 13 are used to create the required background gas and gas conditions in the constant volume combustion bomb 8.

[0041] S2: After the background conditions meet the requirements, the control computer 2, ECU 3, oil tank 14, oil pump 16, fuel filter 15, pressure control valve 17, high-pressure oil rail 18, oil pressure sensor 19 control fuel injection to meet the required conditions, and the fuel is injected into the constant volume combustion bomb 8 by the oil injector 20,

[0042] S3: The combustion process is observed through the window 22, the excitation light source 23 and the lens 24 with fluorescent material are used to enhance the imaging effect, and the high-speed camera 25 is used to record.

[0043] S4: After the combustion is completed, the combustion product collector 21 collects the combustion products.

[0044] The application meets the experimental requirements by controlling the background gas conditions of the constant volume combustion bomb 8 through the background condition control cabinet 1, enhancing the imaging effect through the excitation light source 23 and the lens 24 with fluorescent material, and controlling the oil pump 16, the pressure control valve 17 and the high-speed camera 25 by the control computer 2 issuing instructions to the ECU 3.

[0045] The application can control the temperature and pressure of the constant volume bomb by the background condition control cabinet 1, and the oil injection and combustion are controlled by the control computer 2 and the ECU electric control unit 3, and the oil pressure control valve and the fuel filter are added in the oil supply pipeline, so that the experimental safety and efficiency are improved. In addition, the combustion product collector 21 can be used to collect the combustion products, which provides convenience and conditions for subsequent tests.

[0046] The working principle of the system for realizing spray combustion visualization is briefly described below in combination with the drawings.

[0047] Before the experiment, the vacuum pump 13 is used to vacuumize the combustion chamber of the constant volume bomb, the gas cylinder 9 is selected according to the required environmental gas, and the opening degree of the gas valve 10 is adjusted according to the volume fraction or concentration of the required environmental gas. Different gases will be stirred into uniform mixed gas in the gas stirrer 11.

[0048] The background condition control cabinet 1 sets the target temperature and target pressure of the constant volume bomb 8, and the temperature and pressure sensors 5 in the bomb body transmit the temperature signal to the background condition control cabinet 1, which adjusts the heating intensity of the thermocouple 4 and the power of the gas compressor 12 to increase the temperature and pressure in the bomb body by calculating the difference between the target temperature and the actual temperature.

[0049] In order to prevent the temperature from rising too fast and the temperature from being too high during the combustion process, the gradient air inlet heating method is adopted, and the water cooling system will work throughout the process. The background condition control cabinet 1 controls the flow of the water pump 6, so that the cooling water from the water tank 7 enters the inner wall of the constant volume bomb through the water supply pipeline, and then returns to the water tank 7 through the water return pipeline.

[0050] The heating intensity of the thermocouple 4 and the power of the gas compressor 12 gradually decrease as the temperature and pressure in the bomb body gradually approach the target value. After the actual temperature reaches the target temperature and stabilizes, the heating intensity of the thermocouple 4 and the flow of the water pump 6 remain unchanged, the gas compressor stops working and the gas valve is closed, and the experiment can be started.

[0051] The excitation light source 23 irradiates the lens 24 with fluorescent material, so that the fluorescent material is in an excited state. The control computer 2 sets the fuel injection pressure and the fuel injection duration, and inputs the instructions to the ECU 3. The ECU 3 controls the flow of the oil pump 16, so that the fuel enters the high-pressure oil rail 18 through the fuel filter 15, and is fed back through the oil pressure sensor 19. The ECU 3 controls the maximum limited oil pressure of the pressure control valve 17 to prevent the oil pressure in the high-pressure oil rail 18 from being too high. When the oil pressure reaches the set value, the control computer 2 issues the fuel injection instructions, and the ECU 3 controls the fuel injector 20 to complete the fuel injection. At the same time, the ECU 3 controls the high-speed camera 25 to start recording. After the spray combustion, the light emitted by the flame is projected on the lens 24 with fluorescent material through the window 22. The fluorescent material that is excited in advance will emit stronger light under the irradiation of the flame light. The areas that are not irradiated by the flame remain in the critical state between the unexcited and excited states. The light emission of the fluorescent material on the lens is captured and recorded by the high-speed camera 25. After the combustion is completed, the combustion products are collected by the combustion product collector 21, and subsequent test analysis is performed.

[0052] The preferred embodiments of the present application have been described above with the aid of drawings, but the present application is not limited to the above examples, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A system for visualizing spray combustion, comprising: It comprises a constant volume combustion bomb (8), a gas supply system, an exhaust system, a fuel supply system, an ECU (3) and a background condition control cabinet (1), The constant volume combustion bomb (8) is provided with a high-speed camera (25) outside the window (22); the gas supply system and the exhaust system are connected with the constant volume combustion bomb (8) through a gas pipeline; the upper part of the constant volume combustion bomb (8) is connected with the fuel injector (20) of the fuel supply system; the fuel supply system and the high-speed camera (25) are respectively connected with the ECU (3) through a signal line. Meanwhile, the constant volume combustion bomb (8) is also provided with a thermocouple (4) and a signal acquisition system, and the thermocouple (4) and the signal acquisition system are respectively connected with the background condition control cabinet (1) through a signal line. The high-speed camera (25) and the window (22) are provided with a lens (24) with fluorescent material, and the lens (24) is provided with an excitation light source (23) below, and the light emitted by the excitation light source (23) is reflected into the window (22) through the lens (24).

2. The system for visualizing spray combustion of claim 1, wherein, The fuel supply system comprises an oil tank (14), an oil pump (16), a fuel filter (15), a pressure control valve (17), a high-pressure oil rail (18) and a fuel injector (20) connected in sequence; the high-pressure oil rail (18) is provided with an oil pressure sensor (19), and the oil pump (16), the pressure control valve (17), the oil pressure sensor (19) and the fuel injector (20) are respectively connected with the ECU (3) through a signal line.

3. The system for visualizing spray combustion of claim 1, wherein, The gas supply system comprises a gas cylinder (9), a gas valve (10), a gas agitator (11) and a gas compressor (12) connected in sequence; the gas compressor (12) is connected with the inner wall of the constant volume combustion bomb (8) through a gas pipe.

4. The system for visualizing spray combustion of claim 3, wherein, A plurality of gas cylinders (9) are arranged on the gas supply system, each of which is connected with a gas valve (10), and different gas cylinders (9) are filled with different types of gas.

5. The system for visualizing spray combustion of claim 1, wherein, It also comprises a water cooling system, which comprises a water pump (6) and a water tank (7), the water pump (6) is connected with the upper end of the constant volume combustion bomb (8) through a water pipe, and the lower end of the constant volume combustion bomb (8) is connected with the water tank (7) through a backwater pipeline; meanwhile, the water pump (6) is connected with the background condition control cabinet (1) through a signal line.

6. The system for visualizing spray combustion of claim 1, wherein, The signal acquisition system is a temperature and pressure sensor (5), which is connected with the inner cavity of the constant volume combustion bomb (8), and the temperature and pressure sensor (5) is connected with the background condition control cabinet (1) through a signal line.

7. The system for visualizing spray combustion of claim 1, wherein, The exhaust system is a vacuum pump (13), and the constant volume combustion bomb (8) is also connected with the vacuum pump (13) through a gas pipe.

8. A method of operating a system for visualizing spray combustion as claimed in any one of claims 1 to 7, characterized in that It comprises the following steps: S1: Adopting background condition control cabinet (1), thermocouple (4), gas temperature and pressure sensor (5), water pump (6), water tank (7), gas cylinder (9), gas valve (10), gas agitator (11), gas compressor (12), vacuum pump (13) to create the required background gas and gas conditions in the constant volume bomb (8); S2: After the background conditions meet the requirements, the control computer (2), ECU electric control unit (3), oil tank (14), oil pump (16), fuel filter (15), pressure control valve (17), high pressure oil rail (18), oil pressure sensor (19) control the oil injection to meet the required conditions and the fuel is injected into the constant volume bomb (8) by the oil injector (20); S3: The combustion process is observed through the window (22), the excitation light source (23) and the lens (24) with fluorescent material are used to enhance the imaging effect and recorded by the high-speed camera (25); S4: After the combustion is completed, the combustion product collector (21) collects the combustion products.

9. The method of operating a system for visualizing spray combustion of claim 8, wherein, The fluorescent material on the lens (24) with fluorescent material is excited by the excitation light source (23) to make it in the excited state, which enhances the imaging effect.

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