弯掠翼叶轮内流压力场的计算机数值仿真

Numerical simulation of internal pressure fields in skew-swept impeller

采用计量流线曲率和旋转流动的改进的曲率时间尺度k ε湍流模型和Navier Stokes方程组求解 ,对宇宙航空弯掠翼型叶轮和对比用基准叶轮的内流压力梯度场进行了计算机数值仿真 ,分析了压力梯度场的变化规律及其作用机制 .仿真结果表明 :弯掠叶轮数值仿真必须选择计量曲率和旋转影响的改进湍流模型 ;弯掠翼型形成的C型压力梯度场有益于抑制低效流谱 ;

By employing k-ε turbulent model improved by cu rv ature-timed scale and Navier-Stokes equations solver, computer numerical simul ation of the internal pressure distributions of skew-swept impeller used in spa ce aviation and its baseline impeller was conducted. The varying regularity and its mechanism were analyzed. The results indicated that the improved k-ε t urbulent model must be selected in the numerical simulation of skew-swept impel ler; the C-type pressure distribution formed by the skew-swept airfoils was he lpful to depress the low-moment fluid; the internal fluid fields can be control led by pressure gradient by means of moving overlapped spots.