薄片分离过程流场特性的数值仿真研究  

Numerical study of multi-plates separating flow and characteristics

作　　者：黄蓓[1] 王浩[1] 陶如意[1] 刘赟[1] 

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《空气动力学学报》2013年第2期213-218,238,共7页Acta Aerodynamica Sinica

摘　　要：利用弹簧近似法和局部网格重构相结合的非结构动网格方法,耦合求解Navier-Stokes方程和六自由度刚体动力学方程,数值模拟了三维薄片非定常分离过程。数值仿真结果有效反映出薄片分离过程中运动速度、轨迹、受力变化规律及流场特性的发展与变化。根据数值仿真结果对薄片分离机理、多体气动干扰作用进行了分析。分离过程中单个薄片与主体段周围形成复杂流动,并伴随着尾迹涡的运动、发展等非定常过程。气动载荷的非线性变化是薄片分离的主要原因。Spring analogy and remeshing method for dynamic unstructured grids are used to solve the problem of plates dispersion under low velocity flow. The process of plates dispersion is dynamically simula- ted by solving the Navier-Stokes equations coupled with six-degrees of freedom equations. The computational solution reveals the variations of velocity, trajectory, forces and flow characteristics effectively. The separa- ting principle and aerodynamic interference among multi-plates are analysed based on the results. In the un- steady separating process the flow between single plate and mainbody is complex along with the form, move- ment and decline of wake. The nonlinear aerodynamic pressure on plate is the main reason for separation.

关 键 词：非结构动网格 多体分离 不可压缩非定常流 薄片 数值模拟 

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]