非定常俯抑振荡下的横向喷流数值模拟

Numerical Simulation of Lateral Jets with Forced Pitching Oscillation

采用高精度格式数值求解RANS方程,研究了定常状态下横向喷流流场,压力分布计算结果与实验结果基本吻合,并捕捉到喷流干扰流场中多种流动结构。在非定常计算过程中,飞行器的振动引起了法向力和俯仰力矩系数的相位滞后,推力放大因子随俯仰角周期变化。飞行器振动过程中,喷流流场的动态气动特性与稳态喷流有明显的区别,因此在利用横向喷流对飞行器进行姿态控制时,应该考虑由于飞行器姿态的变化对横向喷流所产生的非定常影响问题。

The interaction flowfield with .lateral control jet was studied by solving RANS equations with high order and high precision scheme. The numerical results and flowfield structures are in reasonable agreement with the experimental data and referential numerical results, which indicate that the numerical methods can be used for lateral jet study. During the forced oscillation, the phase of the normal force and pitching moment shows the hysteresis and the normal force amplification factor change with the pitching angle periodically. The aerodynamic performance shows great difference with the steady jet flowfield. So the unsteady lateral jet effect must be paid attention in reaction control svstem design.