悬停共轴双旋翼干扰流动数值模拟  

Numerical simulation of interaction unsteady flows around co-axial rotors in hover

作　　者：许和勇[1] 叶正寅[1] 

机构地区：[1]西北工业大学航空学院翼型叶栅空气动力学国防科技重点实验室,西安710072

出　　处：《航空动力学报》2011年第2期453-457,共5页Journal of Aerospace Power

基　　金：中国博士后科学基金(20100481368);重点实验室基金(9140c42010210zs51)

摘　　要：基于非结构动态嵌套网格方法,通过求解三维非定常Euler方程对悬停共轴双旋翼直升机的复杂流场进行了数值模拟研究.双旋翼之间的干扰使得两者的拉力性能下降,上旋翼对下旋翼的干扰程度远大于下旋翼对上旋翼的影响程度.下旋翼处的下洗速度比单旋翼的要大得多,而上旋翼的下洗速度比单旋翼的略大一些,几乎相同.桨叶总距角增加,则下洗速度和拉力系数增加.双旋翼之间距离增加,则上旋翼拉力系数增加,下旋翼拉力系数减小,总拉力系数减小.Numerical simulation of three-dimensional（3-D）unsteady Euler equations was conducted to investigate the unsteady flows around co-axial rotors in hover.The thrust performances of two rotors became worse because of the interaction b etween them,and the influence of the upper rotor on the lower rotor was greater than that of the lower rotor on the upper rotor.The downwash velocity at the low er rotor plane was much larger than that at an isolated rotor plane,and the down wash velocity at the upper rotor plane was a little larger than that at an isola ted rotor plane.The downwash velocity and thrust coefficient became larger when the collective angle of blades was added.With the increase of distance between t he two co-axial rotors,the thrust coefficient of the upper rotor increased,and t he total thrust coefficient reduced,because the thrust coefficient of the lower rotor dropped greater than the increment of the upper rotor.

关 键 词：共轴双旋翼 非结构网格 嵌套网格 拉力系数 欧拉方程 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]