中文说明：有限体积法求解一维欧拉方程采用二阶MUSCL迎风格式，计算一维等熵喷管的流程，喷管扩张段有正激波。有助于理解和学习MUSCL格式
English Description：
The one-dimensional Euler equation is solved by the finite volume method. The second-order muscl upwind scheme is used to calculate the flow of one-dimensional isentropic nozzle. There are positive shock waves in the divergent section of the nozzle. It is helpful to understand and learn muscl format