An Experimental Device for the Visual Study of Microwave Plasma-Assisted Ignition

Abstract

The invention discloses an experimental device for visual research of microwave plasma assistant ignition. The experimental device comprises a spark plug system, a microwave system, a constant volume napalm bomb system, an optical photographing system and a control system; and the control system sends out three synchronous pulse signals with specific phase differences, wherein the first pulse signal triggers the spark plug system to generate high voltage pulses for discharging and breaking down rarefied mixed fuel gas to form an initial plasma group; the second pulse signal triggers the microwave system to generate microwave pulses with specific frequency and specific power to couple energy in the plasma group so as to expand the plasma group to realize ignition; and the third pulse signal triggers the optical system to penetrate through a quartz window of the constant volume napalm bomb system to be focused on a microwave antenna and a high-voltage electrode center so that the optical photographing system can start photographing and record the whole process of the experiment. According to the experimental device, the ignition mode of a microwave integrated spark plug is reserved, and the action process of microwave plasma assistant ignition can be truly reflected.

Description

technical field [0001] The invention relates to the field of plasma-assisted ignition and combustion, and more particularly relates to an experimental device for visually researching microwave plasma-assisted ignition. Background technique [0002] With the deterioration of the environment and the advanced consumption of energy, the protection of the environment and the efficient use of energy have become more and more personal demands of human beings. Engine researchers are also constantly exploring "energy saving and emission reduction" technologies. Lean combustion technology uses high air-fuel ratio and high compression ratio to improve fuel economy and exhaust emission level. It is one of the most potential combustion methods in the field of internal combustion engines to improve the thermal efficiency of internal combustion engines. However, when the internal combustion engine achieves lean combustion or even ultra-lean combustion, there are problems such as difficulty...

AI Technical Summary

Problems solved by technology

[0010] (1) Due to the narrow space between the ground electrode and the positive electrode of the integrated spark plug, the free development of the spherical flame is limited;

[0011] (2) Since Schlieren and other technologies are basically flat light shooting, the cylindrical part of the integrated spark plug and the "L"-shaped ground electrode will block the optical path;

[0012] (3) The cylindrical part of the integrated spark plug and the "L"-shaped ground electrode are relatively large in size, which will increase the heat transfer loss and weaken the effect of microwave energy on the plasma

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