斜激波与弓形激波相互作用的彩虹纹影实验研究

Experimental Investigation on Oblique Shock and Bow Shock Interaction with Rainbow Schlieren

关键词:  激波相互作用  IV型激波干扰  彩虹纹影  流动显示

Key words:  Shock-shock interaction  Type IV shock interaction  Rainbow schlieren  Flow visualization

摘要:

斜激波与弓形激波相互作用形成的波系结构可以分为六类，其中IV型激波干扰产生了超声速“喷流”，产生了极高的热载和压载。基于彩虹纹影显示技术，实验获得了六类激波干扰彩虹纹影照片，分析了各类激波干扰的波系结构。通过数值计算，获得了有无斜激波干扰的条件下，壁面附近温度与压强的分布，讨论了IV型激波干扰产生极高热载和压载的原因。研究表明，激波干扰发生以后，钝头体表明压载与热载急剧增加，尤其是IV型激波干扰，形成的超声速“喷流”射向钝头体壁面的超声速射流，会导致峰值压力剧烈升高，其数量相当于来流静压的近40倍，驻点附近的热流升高将近8倍。

Abstract:

There are some typical fluid states in the hypersonic vehicle. As one of these typical fluid states，oblique shock and bow shock interaction on the hypersonic inlet lip lead to the most serious pressure load and heat exchange，which possess much serious influence on hypersonic inlet and the hypersonic vehicle. It could be divided into six types of shock-shock interaction in this typical fluid state，and the type IV shock-shock interaction leads to supersonic jet. Six types of shock-shock interaction were obtained by rainbow schlieren system. Feature of temperature and pressure distribution at blunt body was discussed and the mechanism of serious pressure load and heat exchange was analyzed. The result shows that the pressure load and heat exchange will increase sharply after the shock-shock interaction，especially in the type IV shock-shock interaction which will lead to more than 40 times pressure load and more than 8 times heat exchange to the isolated blunt body because of its supersonic jet.