摘要
采用求解N-S方程的数值模拟方法研究超音速空腔流动中来流马赫数、空腔长深比和旋成体相对空腔的距离等参数对旋成体纵向气动特性的影响。数值模拟中采用LU-SGS方法、Roe通量差分分裂方法和SA湍流模型。结果表明,马赫数和空腔长深比对离开空腔不同距离上的旋成体产生的法向力和轴向力影响不大。小长深比空腔对旋成体上的俯仰力矩基本没有影响,但中到大长深比空腔对旋成体上的俯仰力矩特性有明显影响,旋成体刚离开空腔时,中长深比空腔对旋成体产生更大的头部趋近空腔的俯仰力矩,且随着马赫数增加俯仰力矩峰值更大。
Effects of Mach number, length-to-depth ratio of cavity and separation distance from cavity on longitudinal aerodynamic charac- teristics of a generic store in supersonic cavity flow were investigated by solving N-S equations. Implicit LU-SGS, Roe＇ s scheme and S-A turbulent model were used in the numerical simulations. The simulated results show that Mach number and length-to-depth ratio of cavity have small effects on normal force and axial force of the store separated through the cavity flow field. The cavity with low length-to-depth ratio has little effect on pitching moment of the store, whereas the cavities with moderate and high length-to-depth ratio have considerable effects on the pitching moments. The higher length-to-depth cavity produces greater pitching moments to force the nose of store toward the cavity as the store is in nearby region of the cavity. The peak pitching moment on the store increases as Mach number increases.
出处
《弹箭与制导学报》
CSCD
北大核心
2016年第5期97-100,共4页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
超音速流动
空腔
旋成体
气动特性
数值模拟
supersonic flow
cavity
generic store
aerodynamic characteristics
numerical simulation
