火箭发动机塞式喷管流场的数值研究

用时间相关法和张涵信的无振荡、无自由参数ＮＮＤ显式格式，对火箭发动机塞式喷管二维轴对称定常流场进行了数值模拟。计算得到了有粘和无粘中两种情况下，喷管流场的马赫数压强、温度、流线以及速度矢量分布图，计算网络采用代数方法生成，并通过求解Ｌａｐａｃｅ方程对网格进行修正。计算结果表明：ＮＮＤ格式用于计算塞式喷管流场具有较高的效率和良好的分辨率；无粘和有粘情况得到的流场结构有较大的差别；基础喷管的出口马赫数

Numerical study on plug nozzle flow field

Zhang's Non oscillatory, Non free parameter Dissipative (NND) explicit scheme was applied to the analysis of inviscid and viscous axisymmetric steady plug nozzle flow field by time dependent method Contours of Mach number, pressure, temperature and velocity vector distribution were obtained The grid mesh for the calculation was generated by algebra method in conjunction with solving Laplace equation to improve the mesh quality Calculation results show that NND scheme is efficient in the numerical simulation for plug nozzle flow field Calculation results also indicate that the inviscid flow structure is quite different from that of the viscous one, and the exit Mach number and total pressure of the base nozzle highly affects the nozzle flow structure