用爆炸波起爆癸烷云雾的两种模式

用垂直激波管研究了400μm癸烷液滴与空气混合物的爆炸波起爆。每种混合物有两个极限起爆能值,即高值Ecu,和低值Ecl。当起爆能的值高于Ecu时,观察到100%发生爆轰;而当其低于Ecl时,就不会发生爆轰。有趣的是,当起爆能水平在Ecu和Ecl之间时观察到对应于不同的起爆能水平有不同的起爆行为。如实验结果所表明的,爆轰的激发不仅是由于直接起爆,而且也由于“爆燃”到爆轰的转变。

Two Models of Blast Initiation of Detonation in Decane Spray

The blast wave initiation of detonation in a 400um decane spray in air was studied by using a vertical shock tube. Twocritical values of initiation energy were found for each mixture, i. e,the upper value, Ecu, and the lower value, Ecl. For initiation energylevel higher than Ecu, direct initiation of detonation was observed100%of the time, while for that lower than Ecl, no detonation wouldoccur.Interestingly,different initiation behaviors were observed with variousinitiation energy levels in-between Ecu and Ecl. As indicated by theexperimental results, dctonation could be attained not only by the di-rect initiation of detonation,but also by a transition from "deflagra-tion" to detonation.