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以光学窗口的气动光学效应研究为背景,针对影响光学传输预测的流场湍流脉动量预测问题,选取平板、压缩拐角、凹腔流动模型,采用大涡模拟(LES)方法开展超声速湍流脉动工程预测模型的系数修正研究.结果表明,LES方法能够获得无激波干扰、强激波干扰及底部大分离条件下,湍流密度脉动的定量分布,并据此给出脉动工程模型的系数修正结果,该结果已经应用于型号飞行器的光学窗口气动光学效应预测中.
Based on the study of the aerodynamic optical effect of the optical window, aiming at the prediction of the turbulent flow in the turbulent flow field which predicts the optical transmission, the plate, compression corner and cavity flow models are selected and the LES method is used to predict the supersonic turbulent pulsation. The results show that the LES method can obtain the quantitative distribution of turbulent density pulsations without shock interference, strong shock interference and large bottom separation, and the result of coefficient correction of the pulsation engineering model is given. The results have been applied to the prediction of aerodynamic optical effects in optical windows of model aircraft.