CN114061961A - Tracer adding and calibrating system for internal combustion engine visual test - Google Patents
Tracer adding and calibrating system for internal combustion engine visual test Download PDFInfo
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- CN114061961A CN114061961A CN202010758281.2A CN202010758281A CN114061961A CN 114061961 A CN114061961 A CN 114061961A CN 202010758281 A CN202010758281 A CN 202010758281A CN 114061961 A CN114061961 A CN 114061961A
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 13
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/108—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using optical methods
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
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- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Testing Of Engines (AREA)
Abstract
The invention provides a tracer adding and calibrating system for visual test of an internal combustion engine, which is characterized by comprising the following components: a tracer addition module for mixing a tracer into a traced agent to form a mixed gas; a calibration cavity module for containing the mixed gas to form a test area; the laser light path module is used for generating laser for testing and guiding and stopping the laser; an image acquisition module for capturing light generated by the excitation of the tracer by the laser; and the synchronous control module is used for synchronizing the laser light path module and the image acquisition module.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a tracer adding and calibrating system for an internal combustion engine cylinder visual test process.
Background
The internal combustion engine will be the primary source of motive power for the vehicle in the foreseeable future. The energy conservation and emission reduction of the internal combustion engine are the main part of the energy conservation and emission reduction for a long time. The development of internal combustion engines faces two major challenges of environmental pollution and petrochemical energy shortage. Increasing the efficiency of internal combustion engines while reducing harmful emissions has become an important issue to be solved urgently in future internal combustion engines for vehicles.
Researchers have adopted laser testing means on modified visual internal combustion engines to study internal conditions of the internal combustion engines. Through going deep into the internal-combustion engine, research spraying, gas mixture form, combustion process and pollutant generation process can provide the most direct experimental basis and verification means for the optimization and innovation of internal-combustion engine design. At present, the optical diagnosis technology applied to the internal combustion engine cylinder at home and abroad mainly comprises a high-speed photography/schlieren method, a particle imaging speed measurement method, a laser Doppler speed measurement method, a laser Mie scattering method, a Rayleigh scattering method, a Raman scattering method, a laser-induced blazing light method, a laser-induced fluorescence method and the like.
When specific studies (such as distribution of in-cylinder mixture gas, distribution of in-cylinder exhaust gas, etc.) are conducted using certain laser testing methods (such as using, for example, laser-induced fluorescence, laser-induced glow, laser mie scattering, etc.), it is sometimes necessary to add a tracer (such as acetone, 3-pentanone, benzene, 2, 3-butanedione, dimethylpropylamine, N-dimethylpropylamine, smoke, etc.) in order to be able to identify the specific location of the object to be traced (referred to as the tracer). And because parameters such as the optimal tracer concentration, the delay time of the laser and the like need to be determined, a large amount of calibration work needs to be carried out.
Disclosure of Invention
According to an embodiment of one aspect of the present invention, there is provided a tracer addition and calibration system for visual testing of an internal combustion engine, the system comprising: a tracer addition module for mixing a tracer into a traced agent to form a mixed gas; a calibration cavity module for containing the mixed gas to form a test area; the laser light path module is used for generating laser for testing and guiding and stopping the laser; an image acquisition module for capturing light generated by the excitation of the tracer by the laser; and the synchronous control module is used for synchronizing the laser light path module and the image acquisition module.
According to an embodiment of one aspect of the present invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises the tracer addition module mixing in a tracer bath.
According to an embodiment of one aspect of the invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises a tracer addition module which performs mixing in a multi-layer partition manner.
According to an embodiment of one aspect of the present invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises the tracer addition module adjusting the concentration of the tracer by adjusting a valve opening of the tracer bath and adjusting the temperature of the tracer.
According to an embodiment of one aspect of the present invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises the tracer addition module adjusting the concentration of the tracer by adjusting the flow rates of the tracer and adjusting the temperature of the mixed gas.
According to an embodiment of one aspect of the invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises that the calibration cavity module comprises two quartz windows for laser access and a bottom fluorescent window and is provided with a calibration gas inlet, outlet and sensor.
According to an embodiment of one aspect of the present invention, the tracer adding and calibrating system for visual testing of an internal combustion engine further comprises that the laser light path module comprises a laser, a sheet light and light path component and a beam cut-off device.
According to an embodiment of one aspect of the present invention, the tracer addition and calibration system for visual testing of an internal combustion engine further comprises the image acquisition module using an enhanced ccd (iccd) to capture light generated by the tracer upon excitation by the laser.
According to an embodiment of one aspect of the present invention, the tracer adding and calibrating system for the visual test of the internal combustion engine further comprises that the synchronous control system uses a signal generator to generate two paths of signals, and the two paths of signals are respectively sent to the laser path module and the image acquisition module.
According to an embodiment of one aspect of the present invention, the tracer adding and calibrating system for visual testing of an internal combustion engine further comprises a tracer adding module connected with the calibrating cavity module through a pipeline;
according to an embodiment of one aspect of the present invention, the tracer adding and calibrating system for visual testing of an internal combustion engine further comprises that the laser light path module, the calibration cavity module and the image acquisition module are connected through a light path arrangement.
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The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.
FIG. 1 illustrates a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the present invention.
FIG. 2 illustrates a tracer addition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the invention.
FIG. 3 illustrates a tracer addition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to another embodiment of the invention.
FIG. 4 illustrates a calibration cavity module in a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the invention.
Fig. 5 illustrates a laser light path module and an image acquisition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to an embodiment of the invention.
FIG. 6 illustrates a flow diagram for using a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the present invention.
Detailed Description
The following description is of some of the several embodiments of the invention and is intended to provide a basic understanding of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
For the purposes of brevity and explanation, the principles of the present invention are described herein with reference primarily to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of application business process orchestration methods and systems, and that these same principles, as well as any such variations, may be implemented therein without departing from the true spirit and scope of the present patent application.
Moreover, in the following description, reference is made to the accompanying drawings that illustrate certain exemplary embodiments. Electrical, mechanical, logical, and structural changes may be made to these embodiments without departing from the spirit and scope of the invention. In addition, while a feature of the invention may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments as may be desired and/or advantageous for any given or identified function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims and their equivalents.
FIG. 1 illustrates a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the present invention. The tracer adding and calibrating system for the visual test of the internal combustion engine aims at solving the problem of adding and calibrating the tracer in the visual test process of the internal combustion engine. The system mainly comprises a tracer adding module, a calibration cavity module, a laser light path module, an image acquisition module and a synchronous control module. As shown in fig. 1, the tracer adding module is connected with the calibration cavity module through a pipeline; the laser light path module, the calibration cavity module and the image acquisition module are realized through the arrangement of light paths; the connection of the four modules and the synchronous control module is realized through signal lines. The role played by the various modules in the system is described below in terms of specific embodiments.
The tracer adding module is divided into different cases according to different tracers and tracers. FIG. 2 illustrates a tracer addition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the invention. In fig. 2, the tracer is a gas (typically carbon dioxide, nitrogen, argon, etc. gas is used to simulate air or exhaust gas), the tracer is a liquid, and a tracer bath method is used to mix the tracer with the tracer for this case. As shown in fig. 2, the tracer stored in the high-pressure gas tank 201 is adjusted to a required pressure by the pressure regulating valve 202 and then divided into two paths, wherein one path enters the tracer tank 205 after passing through the one-way valve 205 in sequence; while the other path waits to join the previous path after passing through valve 203. The tracer tank 205 is filled with a certain volume of liquid tracer 206, and the gas entering the tracer tank 205 flows out of the tracer tank 205 after being mixed with the tracer 206 in a tracer bath mode, and then is mixed with the previous path of gas after passing through a valve 209. The two gases are combined into one gas, and then the flow is tested by the gas flowmeter 210, and then enters the calibration cavity module. In fig. 2, the tracer tank 205 is placed in a thermostatted water bath 207 and the temperature of the tracer is varied by adjusting the temperature of the water in the water bath 207. In the tracer addition module described in fig. 2, two ways can be used to adjust the tracer concentration in the gas stream: one is to adjust the opening of two valves on two paths of gas; another can be achieved by changing the temperature of the tracer.
FIG. 3 illustrates a tracer addition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to another embodiment of the invention. In the embodiment depicted in fig. 3, both the tracer 304 and the traced agent 301 are gases. For this case, multiple stages of baffles may be used to enhance mixing. The tracer 304 and the tracer 301 pass through the pressure regulating valve 302, the pressure regulating valve 305, the flow regulating valve 303, and the flow regulating valve 306, respectively, and then enter the mixing chamber 307. A plurality of baffle plates are arranged in the mixing chamber 307, and the mixed gas is mixed more uniformly by means of circumfluence. An electric heating wire 308 and a thermometer 309 are also arranged in the mixing chamber 307 to achieve temperature control of the mixed gas. The control of the concentration of the tracer can be realized by controlling the flow of the two gases.
FIG. 4 illustrates a calibration cavity module in a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the invention. As shown in fig. 4, the calibration cavity module is designed following the form of an optical internal combustion engine, and is a cubic structure with transparent quartz windows 401, 406 and 408 mounted on three sides, wherein 405 is the laser direction. The quartz window may be of a size that corresponds to the visualization area of the optical combustion engine. The calibration cavity module can complete the calibration work of the tracer adding module of the optical internal combustion engine with the side-mounted window and the lower-mounted window. The calibration cavity module mainly comprises two quartz windows for laser to enter and exit and a bottom fluorescent window. On the top is arranged a calibration gas inlet 402, a pressure sensor 403 and a temperature sensor 404, and on the side perpendicular to the incident laser is arranged an exhaust 407. The interior of the calibration gas sample pool can be blackened so as to eliminate the interference of stray light.
Fig. 5 illustrates a laser light path module and an image acquisition module in a tracer addition and calibration system for visual testing of an internal combustion engine according to an embodiment of the invention. The laser optical path module mainly comprises a laser 501, a sheet light and optical path component 502 and a beam stop 504. The laser 501 is a device that generates laser light, such as a dye laser, a solid-state laser, and a plasma laser. Since the cross section of the laser is cylindrical, and the general test area is a plane, the laser needs to be shaped into a sheet light by the sheet light and light path assembly 502, and the height and direction of the laser are changed by the sheet light and light path assembly 502 to match the height of the calibration cavity 503. The beam stop 504 absorbs the sheet of light passing out of the quartz window to avoid the laser adversely affecting the laboratory personnel and laboratory equipment. The image acquisition module typically uses an enhanced CCD (i.e., ICCD) 508 to capture the light generated by laser excitation of the tracer, with appropriate filters 506 and lenses 507 being selected depending on the light excited. As shown in fig. 5, the shaped laser enters the calibration cavity 503 in the horizontal direction, and the light generated by the laser excitation vertically passes through the quartz window, is reflected by the 45-degree mirror, and is collected by the ICCD 508.
In experiments, in order to determine the specific moment of the image taken by the ICCD, a synchronization control module is used to synchronize the signal control. There is a degree of time delay for both the laser and the ICCD. The system adopts a signal generator to simulate a trigger signal and is matched with the set rotating speed of the internal combustion engine, after the square wave processing module processes the signal, two paths of signals are generated, one path of signal is sent to a laser, the other path of signal is sent to an ICCD camera, and the synchronization between the laser and the ICCD camera can be realized through a digital delay generator module (not shown) of the ICCD.
FIG. 6 illustrates a flow diagram for using a tracer addition and calibration system for visual testing of an internal combustion engine according to one embodiment of the present invention. In the example shown in fig. 6, the in-cylinder exhaust gas position distribution was tested using the planar laser induced fluorescence method. A gas such as carbon dioxide may be used to simulate recirculated exhaust gas in the recirculation system during the course of the experiment. And the tracer adding module is used for adding a certain amount of acetone steam into the carbon dioxide to serve as a tracer, so that the movement condition of the waste gas after entering the cylinder is tracked. As known to those skilled in the art, the tracer is not limited to acetone vapor, but may also be pentanone, benzene, 2, 3-butanedione, dimethylpropylamine, N dimethylpropylamine, smog, and the like. Due to the principle of plane laser induced fluorescence, the concentration of the tracer particles can be judged according to the intensity of the fluorescence of the tracer particles, and therefore the concentration distribution of the recirculated exhaust gas in the cylinder is obtained.
Preheating the laser typically requires an advance, for example, ten minutes. And meanwhile, the parameters of the laser are adjusted to obtain the laser with specific laser wavelength, laser energy and frequency (consistent with the frequency of the oscilloscope). And opening the ICCD, and adjusting parameters such as the focal length of the ICCD to ensure that the ICCD works normally. And (4) inspecting an experimental light path, and generally forming a sheet of light with the thickness of about 1mm and a specific width so as to ensure that an ideal test area is formed in the calibration cavity. After all the above operations are completed, the signal generator can be turned on (for example, the frequency of the signal generator is set to 20Hz, and the condition of 1200rpm of the internal combustion engine is simulated), and the next operation can be carried out.
It is first checked whether the synchronization signal is normal, i.e. whether the signals of the laser, the ICCD and the signal generator are synchronized. Then debugging a tracer adding module: the pressure regulating valve can regulate the outlet pressure of the gas cylinder; the mixed gas with specific acetone concentration is obtained by adjusting the temperature of a valve, a valve and water. Finally, the mixed gas with specific pressure and acetone concentration is obtained. Firstly, opening an exhaust port of a calibration cavity for a period of time to ensure the accuracy of the concentration in the calibration pool; the temperature and pressure sensors on the calibration chamber then ensure that the various parameters required for the experiment have been reached. After all parameters of the three systems are normal, the laser and the ICCD can be triggered to acquire images; after the collection is finished, all experimental equipment can be closed. Through the system, calibration work of parameters such as different acetone concentrations, mixed gas temperatures, mixer pressures, laser energy, laser delay time, ICCD gate delay time and the like can be realized.
Although only a few embodiments of the present invention have been described, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (11)
1. A tracer addition and calibration system for visual testing of an internal combustion engine, the system comprising:
a tracer addition module for mixing a tracer into a traced agent to form a mixed gas;
a calibration cavity module for containing the mixed gas to form a test area;
the laser light path module is used for generating laser for testing and guiding and stopping the laser;
an image acquisition module for capturing light generated by the excitation of the tracer by the laser; and
and the synchronous control module is used for synchronizing the laser light path module and the image acquisition module.
2. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 2, wherein:
and the tracer adding module adopts a tracer bath mode for mixing.
3. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 2, wherein:
the tracer adding module adopts a mode of a multilayer partition plate for mixing.
4. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 2, wherein:
the tracer addition module adjusts the concentration of the tracer by adjusting a valve opening of the tracer bath and adjusting a temperature of the tracer.
5. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 3, wherein:
the tracer addition module adjusts the concentration of the tracer by adjusting the flow rates of the tracer and adjusting the temperature of the mixed gas.
6. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 4 or 5, wherein:
the calibration cavity module comprises two quartz windows for laser to enter and exit and a bottom fluorescent window, and a calibration gas inlet, a calibration gas outlet and a sensor are arranged on the quartz window and the bottom fluorescent window.
7. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 6, wherein:
the laser light path module comprises a laser, a sheet light and light path component and a light beam cut-off device.
8. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 7, wherein:
the image acquisition module uses an enhanced ccd (iccd) to capture the light generated by the tracer upon excitation by the laser.
9. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 8, wherein:
the synchronous control system uses a signal generator to generate two paths of signals which are respectively sent to the laser light path module and the image acquisition module.
10. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 9, wherein:
the tracer adding module is connected with the calibration cavity module through a pipeline.
11. The tracer addition and calibration system for visual testing of internal combustion engines according to claim 10, wherein:
the laser light path module, the calibration cavity module and the image acquisition module are connected through light path arrangement.
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| CN114577485A (en) * | 2022-05-09 | 2022-06-03 | 中国人民解放军国防科技大学 | Device and method for measuring PLIF multi-parameter distribution of scramjet engine by tracing |
| CN116448439A (en) * | 2023-04-03 | 2023-07-18 | 吉林大学 | Compression ignition type engine in-cylinder combustion process combined testing device |
| CN116448439B (en) * | 2023-04-03 | 2023-11-21 | 吉林大学 | Compression ignition type engine in-cylinder combustion process combined testing device |
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