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膨胀管(风洞)是少数几种具备超高速流动模拟能力的地面试验设备之一,针对中国科学院力学研究所高温气体动力学国家重点实验室的爆轰驱动膨胀管JF-16,通过高焓流动数值模拟方法辅助诊断JF-16的流场特性可以发现,高温真实气体效应可以显著增加激波对气体的压缩能力并影响强激波结构,加速段内试验气流静温及化学成分较真实飞行条件有所偏离。为此对JF-16进行升级改造,通过在加速段末端加装锥形喷管,利用喷管的定常膨胀过程进一步调整试验气流的静温,进而提高试验气流品质,同时可以扩大试验区尺度。数值模拟结果表明8°锥角为最优选择,此时试验区尺度可扩大至140mm。
Expansion pipe (wind tunnel) is one of the few ground test equipment with ultra-high-speed flow simulation capability. According to the detonation-driven expansion tube JF-16 of the State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, The flow numerical simulation method helps to diagnose the flow field characteristics of JF-16. It can be found that the real gas effect at high temperature can significantly increase the compressibility of the shock wave to the gas and affect the structure of the strong shock wave. The experimental temperature and chemical composition of the accelerated gas flow in the accelerating section are more realistic Conditions have deviated. To this end, the JF-16 is upgraded and upgraded. By adding a conical nozzle at the end of the accelerating section, the steady temperature of the test gas flow can be further adjusted by the steady expansion process of the nozzle, so as to improve the quality of the test gas flow and expand the scale of the test area. The numerical simulation results show that the 8 ° cone angle is the best choice, and the scale of test area can be enlarged to 140mm.