中文摘要：

应用高速纹影成像技术研究调Q Nd：YAG纳秒脉冲激光诱导火花点燃汽油/空气混合气的火核发展过程，并与传统电火花点火的火核发展过程相对比，详细阐述了激光诱导火花点火过程中有别于电火花点火过程的球形火核发展的三瓣结构火核的形成机理。进一步研究了0.1MPa、363K条件下，激光诱导火花、电火花点燃不同当量比下的汽油/空气混合气的着火概率。研究结果表明：激光诱导火花点火可以提高燃烧速度，并且能扩展稀燃极限，其在点燃当量比0.6（电火花点火稀燃极限）的稀混合气时，着火概率达65%-70%。

英文摘要：

Using high-speed sehlieren photography to record the shape and structure of developing flame kernels in laser-induced spark and electric spark ignited gasoline/air mixtures. In addition, the detailed gasdynamic mechanism and its effects of the flame propagation of the third lobe kernel with laser-induced spark ignition were reported compared to that of the quasi-spherical kernel with electric spark ignition. Then the ignition probability for various mixture equivalence ratio operation with laser-induced spark ignition and with electric spark ignition were tested at temperature of 363 K and pressure of 0.1 MPa, the results indicate that laser-induced spark ignition can improve the burning velocity, and extend the lean burn limit with the maximum ignition probability of 65%-70% for mixture equivalence ratio of 0.6.