Deflagration-to-Detonation Transition Induced by Hot Jets in a Supersonic Premixed Airstream  

作　　者：HAN Xu ZHOU Jin LIN Zhi-Yong LIU Yu 韩旭;周进;林志勇;刘彧(Science and Technology on Scramjet Laboratory,National University of Defense Technology,Changsha 410073)

机构地区：[1]Science and Technology on Scramjet Laboratory,National University of Defense Technology,Changsha 410073

出　　处：《Chinese Physics Letters》2013年第5期105-107,共3页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China under Grant Nos 91016028,91016012 and 51006119.

摘　　要：Detonation is initiated through a hot jet in a supersonic premixed mixture of H2 and air,which is produced by using a air heater.The results show that initiation fails in the low-equivalence-ratio premixed gas.With the increase of equivalence ratio,the hot jet can induce deflagration to detonation transition(DDT)in the premixed mixture,which an indirect initiation of detonation.Further studies show that the DDT process is due to the combined effect of a local hemispherical explosion shock wave,the bow shock,and the flame produced by the hot jet.

关 键 词：MIXED EQUIVALENCE shock 

分 类 号：O35[理学—流体力学]