分离流动对矢量喷管性能的影响

Effects of flow separation on the performance of thrust-vectoring nozzle

关键词:  矢量喷管+  分离流  有限体积法  纳维尔斯托克斯方程

Key words:  Thrust-vectoring nozzle~+  Flow separation  Finite volume method  Navier-Stokes equation

摘要:

采用有限体积法计算了轴对称矢量喷管三维粘性流场,通过改进人工粘性及其边界条件提高了计算的收敛性和数值模拟的精度。利用数值模拟研究了矢量喷管的分离流动对矢量推进性能的影响,通过同实验结果对比,验证了数值模拟的精度。研究表明,分离流动对矢量喷管的性能参数尤其是有效矢量角具有较大影响。

Abstract:

Finite Volume Method (FVM) is used to calculate the 3-D viscous flow in the vectoring exhaust nozzle. The artificial dissipation and its boundary condition are improved to quicken the convergence and upgrade the precision of the numerical simulation. The effects of the flow separation in axisymmetric thrust-vectoring nozzle on performance of the thrust-vectoring propulsion are investigated. The comparison between the computation and experimental data validates the precision of the numerical simulation. The results show that flow separation has much effect on the performance parameters, especially the efficient deficient angle of the nozzle.