A visual test device and test method for spray and combustion in a diesel engine cylinder

A test device and diesel engine technology, applied in the direction of internal combustion engine testing, etc., can solve the problems of inaccurate temperature field analysis, influence of test results, complex system, etc., to achieve the effect of resource sharing, visualization, and high accuracy

Inactive Publication Date: 2016-01-27
JIANGSU UNIV
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AI Technical Summary

Problems solved by technology

The laser sheet photodiagnosis technology represented by the laser-induced incandescence method is suitable for measuring the instantaneous spatial two-dimensional concentration distribution of a certain plane in the concentrated area of ​​soot generation, and can track a series of processes such as flame structure, ignition, and flame propagation at any time, but the system is complex and expensive
The extinction method is aimed at the characteristics that the scattering and absorption of light by soot particles will attenuate the light intensity. The volume fraction of soot is obtained by comparing the light intensity before and after passing through the soot particle cloud. Although the test device of this method is simple, it is The test results will be affected by the scattering of oil droplets, and the analysis of the temperature field is not accurate enough

Method used

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  • A visual test device and test method for spray and combustion in a diesel engine cylinder
  • A visual test device and test method for spray and combustion in a diesel engine cylinder
  • A visual test device and test method for spray and combustion in a diesel engine cylinder

Examples

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Effect test

example 1

[0056] Example 1: Multiple spray test of electronically controlled common rail diesel under anaerobic conditions.

[0057] Test conditions: a 4-cylinder electronically controlled high-pressure common rail diesel engine, fuel injection pressure 100MPa, "ω" type combustion chamber with boss, diesel engine speed 1500rpm, fuel injection timing -10℃A. The basic setting parameters in the test process: the exposure rate is 10kHz, the image resolution is 640×480 pixels, and the exposure time is 80μs. According to the structure of the combustion chamber and the position of the injector nozzle, a 60° endoscope lens is selected. The air in the diesel engine test cylinder was replaced with industrial-purity nitrogen. The specific method is as follows: isolate the intake air pipe of the diesel engine test cylinder from the air, and connect it to the cylinder filled with nitrogen through the pressure regulator barrel, so that the cylinder cannot burn because there is no oxygen after inject...

example 2

[0059] Example 2: On a 4105 electronically controlled high-pressure common rail diesel engine, set the diesel engine speed to the rated speed of 1500r / min, and when the load is 50%, the B90E10 ethanol biodiesel and pure petrochemical diesel are respectively burned under the same working condition, and the device is used to measure Combustion pictures were obtained, and the image processing system was used for calculation and analysis. Compared with pure petrochemical diesel fuel, the flame temperature in the cylinder was significantly lower when burning B90E10 ethanol biodiesel. The maximum flame temperature was 2400K, which was about 300K lower than pure diesel oil. When the crank angle is moved backward, the soot concentration is also reduced by about 20 KL factors.

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Abstract

The invention relates to a diesel engine in-cylinder spraying and combustion visualization testing apparatus and testing method. The testing apparatus is mainly composed of a digital CCD camera, a computer image acquisition and processing system, a nitrogen cylinder, a pressure stabilizing barrel, a compressed air bottle, a pressure reducing valve, a light-emitting unit, an angle marking instrument, a frequency multiplier, a stroboscopic gun, a diesel engine test cylinder, an endoscope and a stroboscope. During testing, an optical system top head center corresponding to a mechanical top head center of a diesel engine is found out; initialization parameter setting is carried out; dynamic spraying image collection and in-cylinder combustion dynamic shooting are carried out; collected image processing is carried out by using system software of the computer image acquisition and processing system; and then the collected image is processed by using the system software of the computer image acquisition and processing system. According to the invention, with the visualization testing apparatus and testing method, the basis can be provided for the research of improvement of diesel engine air-intake organization, spraying and combustion chamber structure; the accuracy of the apparatus is high; and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of in-cylinder combustion of internal combustion engines, and mainly relates to a dynamic visualization test device and a test method for spray and combustion characteristics in a diesel engine cylinder, and in particular to an electronically controlled high-pressure common rail diesel engine in-cylinder multiple times under anaerobic conditions. Visual testing device and testing method for spray and combustion characteristics. Background technique [0002] The spray and combustion process of a diesel engine is the core of its working cycle, which directly affects the power, economy and emission indicators of the diesel engine. Because the spray and combustion process of the internal combustion engine is very complicated, the test is very difficult, so the test work has long been valued by internal combustion engine researchers and production departments all over the world. Diesel engine spray and combustio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/05
Inventor 宁海强孙平梅德清胡鹏肖淑梅邬齐敏贾和坤
Owner JIANGSU UNIV
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