侧向喷流与舵面运动相互干扰的数值模拟研究

Numerical Study on the Interaction of Lateral Jet and Rudder Movement

针对脉冲喷流以及舵面运动与侧向喷流间相互干扰的非定常动态响应问题,应用非定常数值模拟方法和局部网格动态变形技术,研究了脉冲喷流启动和关车时喷流干扰流场的建立过程,分析了不同频率的脉冲喷流间可能导致的干扰效应。研究发现,高频的脉冲喷流间会形成强烈的干扰,严重时喷流放大因子只有正常情况下的1/4。舵面的快速运动也会导致严重的非定常迟滞效应,舵面运动与喷流干扰效应的相位延迟甚至超过90°,因此在进行舵面与喷流的复合控制系统设计时,必须考虑舵面运动导致的非定常迟滞效应。

In order to simulate the unsteady dynamic response problem of pulse lateral jets and the interaction of lateral jets and rudder movement, both unsteady numerical simulation method and local dynamic mesh deforming technique are developed. The establishing processes of interaction flow fields are studied when the lateral jets are opened and closed, and the interactive effect between pulse lateral jets with different frequencies are analyzed. The results show that strong interaction can occur in the case of high frequency pulse lateral jets, with the force amplification factor being only one quarter of the normal condition in the most serious case. Rapid rudder movements can also induce severe unsteady hysteresis, in which the phase lag between the rudder movement and the interaction effects of jets would exceed 90 degrees. Therefore, the unsteady hysteresis effects induced by rudder movement must be taken into account for design of blended control system involving both lateral jets and rudder movement.