激光诱导火花点火击穿阈值分析及试验对比  

A comparison on the breakdown threshold value of laser-induced'spark ignition between calculation and measurement

作　　者：李强[1] 魏建勤[2] 

机构地区：[1]桂林航天工业高等专科学校,广西桂林541004 [2]浙江大学动力机械及车辆工程研究所,浙江杭州310027

出　　处：《激光杂志》2011年第5期39-41,共3页Laser Journal

摘　　要：激光诱导火花点火具有点燃稀混合气从而降低排放的潜力,因此成为近年来内燃机燃烧的研究热点之一。对激光诱导火花点火击穿阈值解析式的量纲进行了分析,并与文献中的试验结果进行了对比。理论预测及试验结果均表明:当环境压力为大气压力或内燃机压缩终了压力、同时激光波长为1064nm或532nm时,激光诱导击穿阈值随压力的增大而减小,但计算阈值和试验阈值减小的规律不同。由试验所得到的激光诱导击穿阈值与压力的-0.3^-0.7次方成正比,而由解析式所得到的激光诱导击穿阈值与压力的-1^-2次方成正比。Laser-induced spark ignition has become a research hot topic-in recent years because it has the potenti-al to ignite lean mixture, and then to reduce emission. In this paper, the dimension of the formula for calculating the breakdown threshold value of the laser induced spark ignition is analyzed, and the result is compared with the experimental data shown in literatures. When environmental pressure is about pressure atmosphere or is the compress end pressure in internal combustion engine, and laser wavelength is 1064nm or 532nm, the breakdown threshold value of laser induced reduced as pressure increased whether the calculation prediction or the experiment measurement, but the reduced rate of the breakdowrt threshold value obtained by calculation is different with by expreriment. The breakdown threshold value obtained by experiment is proportional to the pressure with the power of-0.3 to -0.7. In contrast, the breakdown threshold value otained by formula,it is proportional to the pressure with the power of- 1 to - 2.

关 键 词：激光 火花 点火 击穿 内燃机 

分 类 号：TK413.9[动力工程及工程热物理—动力机械及工程]