Hypersonic Combustion by Standing Detonation Using Counter-Supersonic Flow

利用反超音速流的常备爆轰高超音速燃烧

基本信息

批准号：
17560696
负责人：
ISHII Kazuhiro
金额：
$ 2.24万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560696/
关键词：
Detonation Supersonic Flow Supersonic Combustion Shock Tunnel

项目摘要

1.Extension of the low pressure section of the present detonation driven shock tunnel resulted in longer test time from 0.7 ms to 2.0 ms, although static pressure at the nozzle exit decreases by 20 %.2.OH extinction measurement revealed that duration of supersonic air flow which is not contaminated by the driver gas is about 0.5 ms, which is much less than the theoretical value of 5 ms.3.By using the shock tube in which helium and oxyhydrogen are initially introduced in the high pressure and low pressure section, respectively, it was possible to generate a combustible supersonic flow with static pressure of 70 kPa, static temperature of 600 K, and mach number of 1.2 without spontaneous ignition of the mixture.4.In the case that detonation is introduced perpendicularly to the direction of the combustible supersonic flow, it was found that the diffracted wave front is decoupled into a shock and reaction front. After reflection of the shock front at the bottom surface of the test section, detonation is re-initiated and then propagates upstream and downstream.5.Apparent velocity of detonation in a supersonic flow is faster in the upstream area and slower in the downstream than CJ-velocity by speed of the supersonic flow.6.Smoked foil record shows that cellular structure is deformed in the direction of the supersonic flow. Experimental value of the aspect ration of the cell agrees well with the calculated one based on the CJ-velocity, the velocity of the transverse wave, and the speed of the supersonic flow.

1.现有爆震驱动激波风洞的低压部分的扩展导致测试时间从0.7 ms延长到2.0 ms，尽管喷嘴出口处的静压降低了20%。2.OH消光测量表明超音速空气的持续时间未受驱动气体污染的流量约为0.5 ms，远小于理论值5 ms。 3.采用激波管，首先在激波管中引入氦气和氢氧分别在高压段和低压段，可以产生静压70 kPa、静温600 K、马赫数1.2的可燃超音速流，且混合物不会自燃。 4.垂直于可燃超音速流方向引入爆震，发现衍射波阵面解耦为冲击波和反作用阵面。激波锋面在试验段底面反射后，重新引发爆轰，并向上游和下游传播。 5.超音速流中的爆震表观速度比CJ上游区域快，下游区域慢-速度按超音速流的速度表示。6.烟熏箔记录表明，细胞结构在超音速流的方向上变形。细胞纵横比的实验值与基于CJ速度、横波速度和超声速流速度的计算值非常吻合。