内埋式弹舱与弹体相互影响的精细模拟  

Elaborate Simulation of Interaction Effect between Internal Weapon Bay and Missile

作　　者：张群峰[1] 闫盼盼[1] 黎军[2] 

机构地区：[1]北京交通大学土木工程学院,北京100044 [2]中国航空工业集团公司沈阳飞机设计研究所,辽宁沈阳110035

出　　处：《兵工学报》2016年第12期2366-2376,共11页Acta Armamentarii

基　　金：国家自然科学基金项目(11172283)

摘　　要：为了研究内埋式武器舱弹体投放过程中下落弹体与舱体之间强烈的相互作用,利用基于Menter SST k-ω湍流模型的分离涡模拟方法,结合六自由度刚体动力学方程和重叠网格技术对某一简化开式弹舱和弹体模型的三维流场进行了非定常计算,利用非平稳信号处理方法平滑伪Wigner-Ville分布分析了舱内测点压力的时频特性。研究结果表明:在弹体出舱过程中,剪切层被破坏,导致舱体内流动状态发生较大改变,不再呈现开式舱体自持振荡特性,舱体内噪声的各阶单调声模态不明显,受弹体的影响,舱体内强度较高的涡结构主要集中于舱体后缘,使舱体后缘噪声水平升高;弹体出舱后剪切层迅速重建,自持振荡回路再次形成,舱体流动状态恢复为典型的纯空舱流动状态,但受弹体头部加速气流的影响,剪切层不稳定性增强,导致舱体内部噪声水平升高。弹体在出舱过程中由于剪切层影响受到抬头力矩的作用,使得弹体具有较大的迎角。弹体出舱后,在迎角的影响下,弹体开始受竖直向上的力和低头力矩的作用,竖直向上的力会阻碍弹体的下落。同时,弹体下落过程受舱体强非定常流场的影响,弹体受力也存在强烈的波动。研究结果为内埋武器舱优化设计和制定武器安全投放控制规律提供参考。To study the strong interaction effect between internal weapon bay and missile during the weapon release, the unsteady flow around a simplified weapon bay and missile model is simulated using SST k- ω improved delayed detached eddy simulation （IDDES） method, six-degrees-of-freedom rigid body dynamics equations and overset mesh method. The fluctuation of pressure in the weapon bay is analyzed using the smooth pseudo Winger-Vile distribution （SPWVD） method, and the time-frequency characteristics of pressure are obtained. The research results show that, when a missile is delivered from the weapon bay, the shear layer is destroyed to lead to the change in the flow structure, the self-sustained oscillation disappears in the weapon bay, and there is no obvious cavity tone. Stronger vortexes concentrate in the trailing edge of cavity, and thus the sound pressure level （SPL） in the trailing edge of the weapon bay increases. After the missile is delivered from the weapon bay, the shear layer is rapidly reestablished and the self-sustained oscillation shows up again. The impact of the accelerated flow near the head of the mis- sile leads to enhance the instability in shear layer. Accordingly, the sound pressure level in the weapon bay is enhanced. The missile flies at a large angle of attack since it is affected by upward force moment during passing through the shear layer. After the missile is delivered from the weapon bay, it begins to be affected by vertical upward force and pitch down moment. The vertical upward force can hinder the missile from failing. Meanwhile, the force and moment acting on the missile fluctuate strongly under the effect of the unsteady flow in the weapon bay.

关 键 词：流体力学 内埋舱 武器分离 重叠网格 SST分离涡模拟 平滑伪Wigner-Ville分布 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]