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基于大涡模拟方法与5阶精度混合TCD/WENO格式,对等膨胀射流在马赫数为Ma=0.6条件下的初始流场结构进行了数值模拟。数值结果描述了射流等膨胀过程中,射流初始流场的形成、变化及发展过程。并发现了射流初始流场中涡核为射流失稳的起始点,研究了射流混合层与涡核剪切层上涡的产生、发展与破碎以及它们卷吸环境气体并与射流气体混合的整个过程,揭示了射流初始过程中涡核与涡环直径的变化趋势,得到了射流轴向速度与压力的分布。数值结果可为相关发动机的设计提供重要参考。
Based on the large-eddy simulation method and the fifth-order precision mixed TCD / WENO scheme, the initial flow field structure of the equivalent expansion jet under the Mach number of Ma = 0.6 is numerically simulated. The numerical results describe the formation, variation and development of the initial jet flow field during the jet expansion. And found that the vortex core is the starting point of jet instability in the initial flow field of the jet. The generation, development and fragmentation of the vortex on the jet mixed layer and the vortex core shear layer are studied, and the whole of the mixture of the entrained and jet gases Process, revealing the trend of the vortex core and the vortex ring diameter during the initial jet, and obtaining the distribution of axial velocity and pressure of the jet. The numerical results provide an important reference for the design of the relevant engine.