说明：  安德森《计算流体力学及其应用》第七章拟一维喷管流动的数值解 7.3节 亚声速—超声速等熵喷管流动的CFD解法
(CFD solution supersonic isentropic nozzle flow- Anderson " Computational Fluid Dynamics and Its Applications," Chapter VII of the quasi one-dimensional nozzle flow numerical solution of 7.3 subsonic)