摘要
对绕弹射座椅系统的高速流场进行了数值模拟。控制方程为雷诺平均的Navier-Stokes方程,空间离散为Osher逆风格式和五步龙格库塔格式,湍流模拟采用了基于M-SST两方程紊流模型的DES方法,计算中采用了区域分裂的并行技术。对来流马赫数分别为0.6,1.2的流场进行了计算,计算结果表明该方法可以较好地模拟弹射座椅系统外的高速流场。
Aerodynamic characteristics of an ejection seat system at different attack angles are studied by the numerical method and the flow mechanisms of the flow field are analyzed. The governing equations are Reynolds-averaged Navier-Stokes equations solved by the unstructured finite volume method. Up-wind Osher scheme is used for spatial discretisation and five-stage Runge-Kutta scheme is used for tem- poral discretisation. The detached eddy simulation （DES） model based on Menter-shear stress transport （M-SST） two equation turbulence model is adopted. Parallel computation is based on the domain decomposition method and multi-block is achieved by using METIS system. The message passing interface （MPI） library routines are utilized. Non-blocking communications are used to minimize the communications overhead. Experimental data are used to validate the method. This research is helpful to under-stand the aerodynamic characteristics and flow mechanisms of the ejection seat system at different angles of attack and Mach number, and provides a reasonable reference for ejection seat system design.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2009年第2期202-206,共5页
Journal of Nanjing University of Aeronautics & Astronautics
