薄片状体沉降过程中的多体干扰流场特性  

Flow Field Characteristics of Multi-Plates Interference in Descent

作　　者：黄蓓[1] 王浩[1] 王帅[1] 张博孜[1] 

机构地区：[1]南京理工大学能源与动力工程学院,南京210094

出　　处：《弹道学报》2012年第1期41-46,共6页Journal of Ballistics

摘　　要：针对薄片多体气动力干扰问题,建立了相关的控制方程和湍流方程,分别采用二阶迎风格和全隐式方法进行空间离散和时间离散,建立了含碰撞响应的非结构动网格方法.利用耦合求解Navier-Stokes方程和刚体动力学方程,数值模拟了薄片多体沉降过程.数值模拟结果与试验记录的运动状态符合较好.对薄片多体沉降干扰非定常流场结构变化的分析和对其流动机理的研究结果显示,多体间的干扰不仅改变物体的运动姿态,而且促进分离.近距的初始相对位置下,薄片运动初期产生接触,提供了物体分离的反向冲量.薄片在干扰作用下滞空翻转并存在互斥的趋势,侧缘形成附着涡,伴随着物体运动发展脱落.For the aerodynamics of multi-plates interference,the control equation and turbulent equation were established,and the second-order upwind scheme and fully implicit method were respectively applied to discrete the space and the time.A collision method under unstructured dynamic grids was established by solving Navier-Stokes equations coupled with rigid body dynamics.The descent process of plates was numerically simulated.The simulation results are well consistent with the experiment results.The unsteady flow-field structures and mechanism of multi-plates ＇interferential descent were anlyzed.The result shows that the interference among multi-plates influences their motion and accelerate the separation.The collision results in a reverse impulse to separate the plates at incipient motion under initial close locations.The plates present a repellent trend in fluttering and tumbling motion under the action of interferences.Vortex forms and sheds on the flank with the motion of objects.

关 键 词：非定常流动 非结构动网格 多体干扰 薄片 

分 类 号：O355[理学—流体力学]