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采用自主开发的大涡模拟程序NUL-TURBO,对MT1高压涡轮导叶的跨声速流场进行了数值模拟。在对半叶高位置叶片表面等熵马赫数分布实验数据对比验证的基础上,研究了有无气膜冷却两种情况下叶片表面流场的拟序结构。结果表明:无气膜射流时,叶片吸力面近尾缘位置存在分离转捩过程,并在此过程中发现了发卡涡“森林”现象;有气膜射流时,射流出口位置叶片表面边界层直接转捩为湍流,并发现了叶片压力面逆转捩过程中存在的涡拉伸形态。
The self-developed large eddy simulation program NUL-TURBO was used to simulate the transonic flow field of MT1 high-pressure turbine guide vane. Based on the comparison and verification of the isentropic Mach number distribution on the blade surface at the half height position, the structure of the flow field at the blade surface with or without film cooling was studied. The results show that there is separation and transfer process near the trailing edge of the suction surface of the blade without air film jet, and the phenomenon of hairpin vortex and “forest” is found in this process. When there is film jet, Layer directly turn 捩 turbulence, and found that the blade pressure surface reversal 捩 process exists in the shape of the vortex stretch.