轴对称矢量喷管内流特性的不同湍流模型计算

利用二阶迎风格式，在采用三种不同湍流模型分别对轴对称矢量喷管三维内流场进行对比计算后，S-A-方程模型成为文中数值模拟中最有效的湍流模型，并将此模型计算的结果与模型试验结果进行了分析比较。研究结果表明，在矢量状态下，计算结果和试验结果相比，气动矢量角的相对误差不大于6％，流量系数的相对误差不大于l％，推力系数的相对误差不大于l％，所开发的计算方法可用于轴对称矢量喷管的工程设计。

Computation for the effect of turbulence models on internal performance for axisymmetric vectoring exhaust nozzles

After comparing the results of three different turbulence models in computing 3-D internal flow field of axisymmetric vectoring exhaust nozzles (AVEN) by means of second order upwind schemes, S-A turbulence model became the validest turbulence model used in numerical simulation here, and its results of computation were compared with that of scale model experiments. The results indicated that during nozzle vectoring the relative tolerance of resultant vector angle is less than 6% and the relative tolerance of discharge coefficient is less than 1%. In addition, the relative tolerance of thrust coefficience is less than 1%.