激波/边界层相互作用诱导的激波风洞气体污染问题

中国科学院力学研究所高温气动重点实验室,100080中国科学院力学研究所高温气体动力学重点实验室,100080中国科学院力学研究所高温气体动力学实验室,100080

Test gas contamination induced by the interaction of shock/boundary layer in shock tunnels

Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, 100190, ChinaKey Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, 100190, ChinaKey Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, 100190, China

摘要: 应用多组分NS方程和频散可控耗散格式(DCD)计算了爆轰驱动激波风洞中反射激波/边界层/接触面的相互作用过程，分析了驱动气体与试验气体在壁面射流作用下的掺混机制及其对风洞试验时间的影响. 为了延长风洞的试验时间，提出在风洞贮室内增设环形隔板，以隔离壁面射流，延长风洞试验时间的方法. 计算结果表明：环形隔板确实可以限制驱动气体与试验气体的过早掺混，显著增加激波风洞的有效试验时间.
- 激波风洞 /
- 反射激波/边界层相互作用 /
- 试验气体污染
Abstract: A investigation on the interactions among thereflected-shock, boundary layer and contact region in the detonation-drivenshock tunnel was carried out by applying Navier-Stokes equations in amulticomponent system and the dispersion controlled dissipative (DCD)scheme. In addition, the physical mechanism of test gas contamination causedby the wall jet was analyzed, which dramatically reduces the experimentalduration in a shock tunnel. The numerical results indicated a simple andeffective method of installing to increase the experimental duration.
- shock tunnel /
- reflected shock/boundary layer interaction /
- contamination of test gas