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为了求解二维平面弯曲激波波后流场,讨论并发展了一系列基于流线-特征线坐标系变换的流场代数计算方法。该系列方法依据二维平面流场中气流角、静压沿特征线近似不变的特点,可快速求解平面弯曲激波波后流场。其中,等气流角近似法适合模拟流线轨迹,等静压近似法适合求解波后流场参数。在此基础上,又提出了一种改进的等气流角-等静压混合方法用于计算弯曲激波波后流场。和特征线法对比,等气流角-等静压混合法计算得到的流场基本特征与特征线法得到的结果相同,在来流马赫数Ma=6和Ma=4情况下误差分别仅为0.5%和0.15%,证实了该方法在求解二维平面弯曲激波流场中的适用性。
In order to solve the flow field after two-dimensional plane bending shock wave, a series of flow field algebra calculation methods based on streamline-feature line coordinate system transformation are discussed and developed. The series of methods can quickly solve the post-planar wave-bending shock wave flow field based on the fact that the airflow angles and static pressures in the 2D planar flow field are approximately the same along the characteristic lines. Among them, the equivalent flow angle approximation method is suitable for simulating the streamline trajectory, and the isostatic pressure approximation method is suitable for solving wave field flow field parameters. On this basis, an improved equal-flow-isostatic mixing method is proposed to calculate the flow field after bending shock waves. Compared with the characteristic line method, the basic characteristics of the flow field calculated by the isokinetic-isostatic pressing method are the same as those obtained by the characteristic line method. The errors of the flow Mach Mach number Ma = 6 and Ma = 4 are only 0.5 % And 0.15%, respectively, confirming the applicability of this method in solving the flow field of two-dimensional plane bending shock waves.