Schlieren system based on rapid compressor

Abstract

The invention relates to equipment for researching shock wave and flame propagation characteristics in a fuel combustion process, and provides a schlieren system based on a rapid compressor. The system comprises a light source, a high-speed camera, a knife edge, a spectroscope, a first concave mirror, a second concave mirror and the rapid compressor; the rapid compressor comprises a combustion chamber and a compression chamber, wherein one end of the combustion chamber is covered with a visual end cover, and the other end of the combustion chamber is communicated with the compression chamber;a mirror surface is arranged at the end, facing the visual end cover, of a piston in the compression chamber; a light source and a diaphragm are arranged on an incident light path of the first concavemirror, and the spectroscope is arranged on a reflected light path; the rapid compressor is arranged on a reflected light path of the spectroscope, and the visual end cover is located on the reflected light path of the spectroscope, and the second concave mirror is arranged on a transmitted light path of the spectroscope; the knife edge and the high-speed camera are sequentially arranged on the reflected light path of the second concave mirror. By means of the visual end cover and the mirror surface arranged at one end of the piston, flame and shock wave structures in the combustion chamber can be obtained in real time, and flow field distribution can be captured.

Description

technical field [0001] The invention relates to equipment for studying the shock wave and flame propagation characteristics in the fuel combustion process, in particular to a schlieren system based on a fast compressor. Background technique [0002] At present, in order to meet the carbon dioxide emission regulations and achieve the purpose of energy saving and emission reduction, people usually use the method of increasing the compression ratio to improve the engine efficiency, thus supercharged small-displacement gasoline engine has gradually become the mainstream of technology. [0003] However, with the increase of energy density, knocking may occur in the engine, especially in low speed and heavy load conditions, super knocking is very easy to occur. When knocking occurs, it can worsen combustion and even cause engine damage. So far, it has been found that the conventional engine knock is caused by the spontaneous combustion of the mixture gas at the end, while the sup...

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Problems solved by technology

[0003] However, with the increase of energy density, engine knocking may occur, especially in low speed and heavy load conditions, super knocking is very easy to occur

Detonation can worsen combustion and even cause engine damage when knocking occurs

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