直升机旋翼结冰后三维桨叶气动特性数值分析

针对直升机旋翼桨叶结冰问题,研究了结冰前后三维旋翼桨叶气动特性.基于多参考系模型建立了旋翼桨叶三维结冰数值模拟方法,对其中空气流场计算、水滴撞击特性计算、结冰生成计算和几何模型重构等步骤进行了介绍.以C-T旋翼为模型,计算分析了结冰对旋翼桨叶气动特性的影响.计算结果表明,结冰后旋翼桨叶升力降低、阻力增加,悬停性能下降明显.结冰破坏了桨叶各个截面原有的气动外形,导致涡的产生,使得截面气动特性恶化.

A Numerical Analysis on Aerodynamic Characteristics of Three Dimensional Iced Rotor

In accordance with the icing problem of helicopter rotor blade, the aerodynamic characteristics of three dimensional rotor blade before and after ice up are studied. Based on the multiple reference frame model, a three dimensional numerical simulation method of rotor blade icing is established. The air flow field calculation, droplet impact characteristics calculation, ice accretion calculation and geometric model reconstruction are introduced among them. Taking C T rotor blade as a model, the influence of icing on the aerodynamic characteristics of C T rotor blade is calculated and analyzed. The results show that the lift of rotor blade decreases, the drag increases, and the hovering performance decreases obviously after ice up. The ice accretion damage to the original aerodynamic shape of the blade section results in the generation of vortices and the deterioration of aerodynamic characteristics.