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基于动量方程的特点,本文将只与温度有关的“等熵密度”与熵的变化分离,而由散度型动量方程直接计算出气体经过激波的熵增。与经典势函数方程迭代,可以方便地求解非等熵跨声速流动。从对任意回转面叶栅的跨声速流动计算来看,这种非等熵势函数得到的激波位置可比等熵势函数前移1～2个网格,强度有所减弱,和试验结果较接近。由于各流线的熵不相等,对Kutta条件和出口边界条件作了修正。本文建议的方法也可用于计算流函数的熵增。
Based on the characteristics of the momentum equation, this paper separates only the temperature-dependent “isentropic density” from the change of entropy, and directly calculates the entropy increase of the gas passing through the shock by the divergence momentum equation. With the iteration of the classical potential function equation, the non-isentropic transonic flow can be easily solved. From the calculation of transonic flow in cascade with arbitrary revolving surface, the position of the shock wave obtained by this non-isentropic potential function can be advanced by 1 or 2 grids compared with the isentropic potential function, and its strength is weakened. Compared with the experimental results Close to Since the entropy of each streamline is not equal, Kutta conditions and exit boundary conditions are amended. The proposed method can also be used to calculate the entropy increase of a stream function.