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采用一种混合大涡模拟/雷诺平均Navier-Stokes(LES/RANS)方程模拟方法结合5阶WENO(weighted essentially non-oscillatory)格式对马赫数为3的来流中、内收缩比为1.5的不启动状态下的二维进气道进行了计算,再现了不启动进气道中的非定常流场.计算结果表明:所采用的模拟方法对入口处的平均绝热壁温、摩擦速度和雷诺应力的计算精度较好,进气道不启动流场中激波波系和分离区存在大时空尺度的低频运动,其占主导的特征频率和典型的激波/湍流边界层干扰问题中激波和分离区的低频频率接近,且进气道出现了间歇性的启动状态.
In a mixed-eddy simulation / Reynolds-averaged Navier-Stokes (LES / RANS) equation modeling method combined with a weighted essentially non-oscillatory (WENO) The two-dimensional inlet was calculated and the unsteady flow field in the inlet was reproduced.The results of simulation show that the average adiabatic wall temperature, friction velocity and Reynolds stress The calculation accuracy is good, and there is a large spatio-temporal low-frequency motion in the shock wave system and separation zone in the inlet flow field. The dominant characteristic frequency and the typical shock wave / turbulent boundary layer disturbances in the shock wave and separation The zone’s low frequency is close, and the inlet appears intermittent start-up.