螺旋桨滑流与机翼气动干扰数值模拟研究

分别采用非定常方法和激励盘理论研究螺旋桨滑流对机翼的干扰作用,并对计算结果进行对比分析。非定常方法基于动态面搭接结构化网格,运用有限体积法求解非定常RANS方程。对于激励盘理论,首先采用点对点结构化网格,随单独螺旋桨旋转的方式进行非定常模拟得到螺旋桨桨叶压力分布,然后将桨叶压强分布转化为激励盘载荷分布,最后将载荷分布作为边界条件对干扰流场进行定常模拟。数值结果表明:除了在较大来流攻角时有所差异,两种方式得到的机翼气动力吻合良好;非定常方法可以得到螺旋桨与机翼的瞬时干扰流场,而激励盘理论则可以大大缩短数值模拟的时间并降低计算要求。

Unsteady Simulation Method and Actuator Disk Theory in Numerical Simulations of Propeller′s Interference on Wing

Numerical simulations of installed propeller interference effects on wing aerodynamic characteristics are conducted by time accurate method and actuator disk theory respectively.For time accurate simulation,unsteady Reynolds Averaged Navier-Stokes（RANS） equations are solved by finite volume method based on dynamic patched grids.For actuator disk simulation,the disk load distribution is transformed from propeller blade pressure distribution which is taken from time accurate approach on point to point grids rotating together with the isolated propeller.Then,actuator disk theory is implemented by solving RANS steadily with disk load as a boundary condition.The two methods couples very well with some discrepancy at large angle of attack only,due to larger separation region calculated with actuator disk theory.The time accurate method can provide the details of unsteady interaction field,while the actuator disk model costs much less CPU time.