爆轰波在变截面突扩管道中的传播特性研究  

Propagation Characteristics of Detonation Wave in Variable Cross-Section Sudden Expansion Pipe

作　　者：印华融 翁春生[1] Yin Huarong Weng Chunsheng(National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094

出　　处：《航空兵器》2016年第6期66-72,共7页Aero Weaponry

基　　金：国家自然科学基金项目(11472138)

摘　　要：为了研究截面突扩结构对脉冲爆轰发动机推进性能的影响,需明确粘性对气液两相爆轰波在突扩管道内传播的影响。采用二维粘性CE/SE方法对爆轰波从小管径进入突然扩张的大管径爆轰管的汽油/空气两相爆轰过程进行数值仿真,研究了爆轰波进入二维突扩管后的传播及压强等一系列参数的变化规律及原因。结果表明:爆轰波进入突扩管道后会在拐点位置产生涡流并伴随熄爆的现象,马赫反射的形成将导致高温高压区的形成,使得球形波阵面被抹平,最终再次形成稳定的爆轰波;对于不同管径的突扩段,管径越大,形成马赫杆时的位置越靠后且压力越大;点火强度的改变对稳定爆轰波形成位置及大小的影响较小。In order to study the influence of section sudden expansion structure on the propulsion performance of pulse detonation engine（ PDE）,the viscosity that influences propagation of gas-liquid twophase detonation wave in sudden expansion pipe should be considered. The method of two-dimensional viscous CE / SE is employed to simulate the gasoline / air two-phase detonation process of detonation wave entering large-diameter detonation pipe of sudden expansion from small-diameter pipe. The change laws and reasons for propagation and a series of parameters such as the pressure of detonation wave in two-dimensional sudden expansion pipe are researched. The results show that detonation wave produces a vortex accompanied by the failure of detonation at the location of turning point after entering sudden expansion pipe. The formation of Mach reflection leads to the formation of high temperature and high pressure area which can smooth the spherical wave front,and a steady detonation wave is formed again. For the sudden expansion section of different pipe diameters,the diameter is larger,the position of Mach stem is further back and the pressure is higher. The change of ignition intensity has less effect on the position and size of stable detonation wave.

关 键 词：脉冲爆轰发动机 爆轰波 突扩管道 二维粘性 CE/SE方法 马赫反射 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]