多机起降旋翼间气动干扰数值模拟研究

以多架直升机近距离起降为研究背景,采用基于运动嵌套网格技术的计算流体力学(Computational fluid dynamics,CFD)方法开展旋翼间的气动干扰研究,重点分析了旋翼间距和环境风速对旋翼升力系数和扭矩系数的影响。数值分析结果表明,旋翼之间的气动干扰对上风位置旋翼的影响较小,但会导致下风位置旋翼的升力系数降低,扭矩系数增加,且其影响随着旋翼间距的增加而降低,随着环境风速的增加而增加。

Numerical Simulation of Aerodynamic Interactions Between Multiple Rotors During Take-Off and Landing

The computational fluid dynamics(CFD) method with moving overset grid scheme is used to simulate the aerodynamic interactions between rotors of multiple helicopters during take-off and landing. The influences of different distances between rotors and wind velocities on lift coefficients and torque coefficients are analyzed. Numerical results show that compared with the upwind rotor, the aerodynamic interactions have more influence on the downwind rotor. The aerodynamic interactions lead to the decrease of the lift coefficient and the increase of the torque coefficient for the downwind rotor. The effect of these interactions decreases with the increase of rotor distance and increases with the increase of wind velocity.