高空射流核心区控制的数值分析与试验验证

Numerical analysis and test verification of high altitude jet core area control

为研究高空射流核心区的变化规律,分析了不同模拟马赫数/高度状态下高空射流核心区的物理本质和影响因素。通过理论分析和CFD计算确定了建立自由射流试验需满足的进排气条件,获得了亚声速下喷管出口的核心区角度、超声速下不同马赫数典型流态的临界压比及其随喷管设计马赫数的变化趋势,以及自由射流试验中压力和马赫数等参数的模拟偏差对核心区的影响规律。最后,利用自由射流高空模拟试验验证了理论分析的正确性,为自由射流高空模拟试验研究提供了技术参考。

In order to study the variation of jet core area,the physical essence and influencing factors of jet core area under different simulated Mach number/altitude conditions were analyzed.Through theoretical analysis and computational fluid dynamics(CFD)calculation,the inlet and exhaust conditions for establish⁃ing free jet test were obtained.The angle of nozzle exit core area at subsonic speed,the critical pressure ra⁃tio of typical flow pattern at different Mach number at supersonic speed and its variation trend with nozzle design Mach number were obtained.The influence law of simulation deviation of parameters such as pres⁃sure and Mach number on core area in free jet test was also obtained.The correctness of the theoretical anal⁃ysis was verified by the free jet high altitude simulation test,which provided technical reference for the free jet high altitude simulation test research.