A dual-opposed-piston rapid compressor ignition experiment device

Abstract

The application discloses a kind of double-opposed-piston quick compressor ignition experimental device, comprising: combustion system, including combustion chamber and piston, the both ends of combustion chamber are provided with opening, the opening is connected with the pipeline where piston is located, and the front opening of combustion chamber is provided with window;Gas pressure system, comprising: gas pressure storehouse and quick compressor, gas pressure storehouse is double-opposed structure;Quick compressor can compress air to 10 atmosphere pressure;Sample introduction and exhaust system, comprising: gas cylinder;Mixing gas tank;Vacuum pump, gas in gas cylinder is filled into mixing gas tank by pipeline, vacuum pump is connected combustion chamber and gas pressure storehouse by air extraction pipe, for the vacuum state of combustion chamber and gas pressure storehouse is extracted, premixed gas is stored in mixing gas tank, for premixed gas is filled into combustion chamber by pipeline;Oil pressure system, comprising: oil pressure storehouse and oil pressure pump.The double-opposed-piston quick compressor ignition experimental device can reasonably arrange ignition system, inhibit the occurrence of knock, so that combustion is fully carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rapid compressor experimental device design, and particularly relates to a double-opposed-piston rapid compressor ignition experimental device. BACKGROUND

[0002] At present, most of the piston aeroengines use gasoline as fuel, and compared with gasoline, aviation kerosene has higher flash point, lower volatility, is not easy to ignite at room temperature, is good in economy, and is high in application safety. In recent years, the aviation field has attached great importance to the research on aviation kerosene. However, the lower self-ignition temperature and octane number make aviation kerosene slow in evaporation and combustion speed when applied to spark-ignition engines, and more prone to self-ignition, and thus more prone to knock problems, causing the engine to have problems such as power drop, oil consumption increase, and emission deterioration, and in severe cases, the engine life is shortened and the engine is damaged. The ignition system is a key factor affecting the combustion process of the spark-ignition engine. It is of great significance to use a reasonable method to study different ignition strategies to suppress the occurrence of engine knock. For an engine with a certain fuel, reasonable ignition parameters can effectively improve the in-cylinder combustion and shorten the combustion period, and can reduce the tendency of abnormal combustion, so that the combustion can be fully carried out. In view of this, it is crucial to deeply study and optimize the ignition time and establish an advanced ignition experimental device. SUMMARY

[0003] To solve the above technical problems, the present application aims to establish a double-opposed-piston rapid compressor ignition experimental device to reasonably arrange the ignition system, suppress the occurrence of knock, and make the combustion fully carried out.

[0004] In one aspect, the present application provides a double-opposed-piston rapid compressor ignition experimental device, which comprises:

[0005] a combustion system comprising a combustion chamber and a piston, two ends of the combustion chamber are provided with openings, the openings are connected with a pipeline in which the piston is located, and the front opening of the combustion chamber is provided with a viewing window;

[0006] an air pressure system comprising an air pressure bin and a rapid compressor, the air pressure bin is in a double-opposed structure; the rapid compressor can compress air to 10 atmospheres;

[0007] a sample introduction and exhaust system comprising a gas cylinder, a gas mixing tank, and a vacuum pump; the gas in the gas cylinder is filled into the gas mixing tank through a pipeline, the vacuum pump is connected with the combustion chamber and the air pressure bin through an air exhaust pipe, and is used to vacuumize the combustion chamber and the air pressure bin; the gas mixing tank stores premixed gas, which is filled into the combustion chamber through a pipeline;

[0008] An oil pressure system comprising: an oil pressure tank and an oil pressure pump capable of pumping oil into the oil pressure tank, the oil pressure tank being configured to provide a pressure lock for the piston.

[0009] Further, the double-opposed-piston rapid-compressor ignition experiment device further comprises an information acquisition system, the information acquisition system comprising: a pressure sensor arranged on the combustion chamber for monitoring the pressure in the combustion chamber; an optical probe and a grating monochromator arranged on the combustion chamber for acquiring physical parameters during combustion; a position sensor arranged on the piston for calibrating the position of the piston; an electronic computer and an amplifier and acquisition card, the electronic computer and the amplifier and acquisition card being in data connection, the data acquired by the pressure sensor, the optical probe and the grating monochromator, and the position sensor being input to the electronic computer through the amplifier and acquisition card for analyzing the physical parameters of the combustion process.

[0010] Further, the combustion chamber is a hollow cuboid structure with open ends, and a quartz glass window is arranged on the front face as a viewing window, wherein the viewing window is used for data acquisition by the optical probe and the grating monochromator during the experiment.

[0011] Further, the double-opposed-piston rapid-compressor ignition experiment device is provided with one or more gas cylinders, and the gas in each gas cylinder is input into the gas mixing tank through a pipeline in proportion and pre-mixed for a period of time.

[0012] Preferably, the oil pressure tank can also provide a buffer during rapid compression.

[0013] In another aspect, the present application provides an experimental method using the double-opposed-piston rapid-compressor ignition experiment device according to claim 1, the method comprising:

[0014] Step 1, turn on the vacuum pump to vacuumize the combustion chamber (9) and the gas pressure tank (3);

[0015] Step 2, charge the combustion chamber (9) through the gas mixing tank (5) to the required pressure for the experiment;

[0016] Step 3, turn on the oil pressure pump (8) to pump oil into the oil pressure tank (7), so that the pressure generated in the oil pressure tank (7) is higher than the pressure generated in the gas pressure tank by the compressed air from the rapid compressor (6) in the subsequent step 4;

[0017] Step 4, charge the gas pressure tank (3) with compressed air compressed to 10 atmospheres through the rapid compressor (6);

[0018] Step 5, instantaneously release the oil pressure of the oil pressure chamber (7), and the compressed air in the air pressure chamber (3) pushes the piston (10) to compress the fuel in the combustion chamber (9) at a very fast speed to complete ignition.

[0019] Further, the combustion process images and data are analyzed and studied by the electronic computer (1) to obtain experimental results.

[0020] Further, oil is pumped into the oil pressure chamber (7) so that the pressure generated in the oil pressure chamber (7) is 5 to 10 times the pressure generated in the air pressure chamber by the compressed air from the rapid compressor (6) in step 4. The beneficial effects of the present application are that the double-opposed-piston rapid compressor has a novel structure, that is, each side of the rapid compressor is a mirror image of the other side, and its double-opposed nature is used to maintain a constant high-pressure condition at the end of compression in order to study the pre-flame reaction. Since the induction time is reduced at higher pressures, in order to maintain a short duration of compression time, within this speed limit, a double-opposed piston is used. The complexity of strict machining tolerances is introduced in terms of centering, piston synchronization, and fast but controlled deceleration of both pistons at the end of the stroke. Such a structure can reduce the possibility of vibration and unmatched stopping force, and independent piston plungers are mechanically balanced. Moreover, the experimental device not only covers a temperature range from 400K to 1000K, but also includes a wide range of pressures from 1 to 100atm. This ensures that we can conduct combustion and compression experiments under different working conditions, making the experimental results more representative and scalable. This wide range of experimental working conditions provides researchers with more options, allowing them to conduct more comprehensive and in-depth research under various practical working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The system structure diagram of the double-opposed-piston rapid compressor ignition experimental device according to the present application.

[0022] Explanation of reference numerals: 1. Electronic computer; 2. Amplifier and acquisition card; 3. Air pressure chamber; 4. Gas cylinder; 5. Gas mixing tank; 6. Rapid compressor; 7. Oil pressure chamber; 8. Oil pump; 9. Combustion chamber; 10. Piston. DETAILED DESCRIPTION

[0023] The present application will be described in detail below in conjunction with the drawings and specific embodiments, but the present application is not limited thereto.

[0024] The present application adopts the following technical solutions:

[0025] A double-opposed-piston rapid compressor ignition experimental device, comprising:

[0026] The combustion system comprises a combustion chamber 9 and a piston 10, both ends of the combustion chamber 9 are provided with openings connected with the pipeline where the piston 10 is located, and the front opening of the combustion chamber 9 is provided with a window. In a preferred embodiment, the combustion chamber 9 is a hollow cuboid structure with openings at both ends, and a quartz glass window is installed on the front opening as a window, which is used to cooperate with the optical probe and grating monochromator for data acquisition during the experiment. Through the window, the combustion situation and combustion product composition in the combustion chamber can be directly observed;

[0027] The air pressure system comprises an air pressure bin 3 and a rapid compressor 6, the air pressure bin 3 is in a double-opposed structure, as shown in the figure, so that the two compressors can balance each other, and through the two interacting air pressure bins 3, the rapid compressor model can realize a higher compression ratio, improving the overall efficiency and compression speed of the system. The rapid compressor 6 is the key, which can compress air to 10 atmospheres, providing the ignition power of the device; Figure 1

[0028] The sample injection and exhaust system comprises a gas cylinder 4, a gas mixing tank 5, and a vacuum pump. The gas in the gas cylinder 4 is filled into the gas mixing tank 5 through the pipeline, and the vacuum pump is connected with the combustion chamber 9 and the air pressure bin 3 through the exhaust pipe, which is used to vacuum the combustion chamber 9 and the air pressure bin 3. The gas mixing tank 5 stores premixed gas, which is used to fill the premixed gas into the combustion chamber 9 through the pipeline. Of course, all of these can be realized by opening or closing the lock valve to open or close the passage. In a preferred embodiment, a plurality of gas cylinders 4 are provided, and before the experiment starts, the gas in each gas cylinder 4 is input into the gas mixing tank 5 through the pipeline in proportion, and premixed for a period of time;

[0029] The oil pressure system comprises an oil pressure bin 7 and an oil pressure pump 8, the oil pressure pump 8 can pump oil into the oil pressure bin 7, which can not only provide pressure to lock the piston 10, but also provide buffer during rapid compression to protect the experimental equipment.

[0030] Further, the double-opposed piston rapid compression ignition experimental device also comprises an information acquisition system, which comprises a pressure sensor arranged on the combustion chamber 9 for monitoring the pressure in the combustion chamber; an optical probe and a grating monochromator arranged on the combustion chamber 9 for collecting physical property parameters during combustion; a position sensor arranged on the piston 10 for real-time calibration of the position of the piston 10; an electronic computer 1 and an amplifier and acquisition card 2, the electronic computer 1 and the amplifier and acquisition card 2 are data connected, and the data collected by the pressure sensor, the optical probe and the grating monochromator, and the position sensor are input into the electronic computer 1 through the amplifier and acquisition card 2 for analysis of the physical property parameters of the combustion process.

[0031] ​In another aspect, the present application also provides an experimental method using the above-mentioned double-opposed piston rapid compressor ignition experimental device, which comprises: before the experiment starts, the gas in the gas cylinder (4) is input into the gas mixing tank (5) through the pipeline in proportion, and is pre-mixed for a period of time, and then the experiment starts: open the vacuum pump, start pumping, close the valve first and then close the vacuum pump after the pressure in the combustion chamber 9 and the gas pressure chamber 3 is displayed as negative, to ensure the vacuum condition in the combustion chamber and the gas pressure chamber; open the valve of the gas mixing tank 5, charge the gas into the combustion chamber to the required pressure for the experiment, close the gas mixing tank valve when the pressure gauge reaches the required pressure; open the oil pressure pump 8, pump oil into the oil pressure chamber 7, so that the pressure generated in the oil pressure chamber 7 is higher than the pressure generated in the gas pressure chamber by the compressed air from the rapid compressor; the compressed air compressed to 10 atmospheres is filled into the gas pressure chamber 3 by the rapid compressor 6, and then closed; adjust the optical probe, grating monochromator and other instruments to be in the state of collecting data on the computer 1; instantaneously release the oil pressure of the oil pressure chamber 7, so that the compressed air in the gas pressure chamber 3 pushes the piston 10 to compress the fuel in the combustion chamber 9 at an extremely fast speed, and ignition is completed. Further, the experimental method further comprises opening the vacuum pump to remove the exhaust gas after the experiment is completed. In a preferred embodiment, the experimental method further comprises analyzing and studying the collected data by the electronic computer 1 to obtain the experimental results. Preferably, the oil is pumped into the oil pressure chamber 7 so that the pressure generated in the oil pressure chamber 7 is 5 to 10 times the pressure generated in the gas pressure chamber by the compressed air from the rapid compressor 6 in the subsequent steps.

[0032] The present application aims to build a simulation experimental platform for simulating the ignition moment of an aero-engine, which can be used to study the combustion performance and ignition activity of any engine (car and plane, rocket) fuel, can save cost and meet the laboratory demand. The principle is to create a high temperature and high pressure environment by rapidly compressing air to make the fuel burn and study its combustion performance. The device of the present application can also be applied to the research of new propellants and new fuels.

[0033] It should be noted that the above-described embodiments are only preferred embodiments of the present application. Those skilled in the art can make several modifications, improvements and equivalent substitutions to the present application without departing from the principles of the present application.

Claims

1. A dual-opposed-piston rapid-compression machine ignition experiment device, characterized in that, It comprises: a combustion system, which comprises: a combustion chamber (9) and a piston (10), both ends of the combustion chamber (9) are provided with openings connected with the pipeline where the piston (10) is located, and the front opening of the combustion chamber (9) is provided with a window; a gas pressure system, which comprises: a gas pressure warehouse (3) and a quick compressor (6), the gas pressure warehouse (3) is in a double-opposed structure; the quick compressor (6) can compress air to 10 atmospheres; a sample injection and exhaust system, which comprises: a gas cylinder (4); a gas mixing tank (5); a vacuum pump; wherein the gas in the gas cylinder (4) is filled into the gas mixing tank (5) through the pipeline, the vacuum pump connects the combustion chamber (9) and the gas pressure warehouse (3) through the exhaust pipe, which is used to vacuum the combustion chamber (9) and the gas pressure warehouse (3), the gas mixing tank (5) stores premixed gas, which is used to fill the premixed gas into the combustion chamber (9) through the pipeline; an oil pressure system, which comprises: an oil pressure warehouse (7) and an oil pressure pump (8), the oil pressure pump (8) can pump oil into the oil pressure warehouse (7), and the oil pressure warehouse (7) is used to provide pressure to lock the piston (10).

2. The dual-opposed-piston rapid-compression machine ignition experiment apparatus according to claim 1, characterized in that, It also comprises an information acquisition system, which comprises: a pressure sensor arranged on the combustion chamber (9) for monitoring the pressure in the combustion chamber; an optical probe and a grating monochromator arranged on the combustion chamber (9) for collecting physical parameters during combustion; a position sensor arranged on the piston (10) for calibrating the position of the piston (10); an electronic computer (1) and an amplifier and acquisition card (2), the electronic computer (1) and the amplifier and acquisition card (2) are data connected, the data collected by the pressure sensor, the optical probe and the grating monochromator, and the position sensor are input into the electronic computer (1) through the amplifier and acquisition card (2) for analyzing the physical parameters of the combustion process.

3. The dual-opposed-piston rapid-compression machine ignition experiment apparatus according to claim 1, characterized in that, The combustion chamber (9) is a hollow rectangular structure with openings at both ends, and a quartz glass window is installed on the front opening as a window, wherein the window is used to cooperate with the optical probe and the grating monochromator to collect data during the experiment.

4. The dual-opposed-piston rapid-compression machine ignition experiment apparatus according to claim 1, characterized by, One or more gas cylinders (4) are provided, and the gas in each gas cylinder (4) is input into the gas mixing tank (5) in proportion through the pipeline and premixed for a period of time.

5. The dual-opposed-piston rapid-compression machine ignition experiment apparatus according to claim 1, characterized by, The oil pressure warehouse (7) can also provide buffering during the rapid compression process.

6. An experimental method using the dual-opposed-piston rapid-compressor ignition experiment device according to claim 1, characterized by, It comprises: Step 1, turn on the vacuum pump to vacuum the combustion chamber (9) and the gas pressure warehouse (3); Step 2, fill the gas into the combustion chamber (9) through the gas mixing tank (5) to the required pressure for the experiment; Step 3, turn on the oil pressure pump (8) to instantaneously pump oil into the oil pressure warehouse (7), so that the pressure generated in the oil pressure warehouse (7) is higher than the pressure generated in the gas pressure warehouse by the compressed air from the quick compressor (6) in the subsequent step 4; Step 4, fill the compressed air compressed to 10 atmospheres into the gas pressure warehouse (3) through the quick compressor (6); Step 5: Instantaneously release the oil pressure of the oil pressure chamber (7) to make the compressed air in the air pressure chamber (3) push the piston (10) to compress the fuel in the combustion chamber (9) at a very fast speed to complete the ignition.

7. The experimental method of claim 6, wherein, Also included: Step 6: Analyze and study the collected data by the electronic computer (1) to obtain the experimental results.

8. The experimental method of claim 6, wherein, Instantaneously pump oil into the oil pressure chamber (7) to make the pressure generated in the oil pressure chamber (7) 5 to 10 times the pressure generated in the air pressure chamber by the compressed air from the fast compressor (6).

Images