基于CFD方法的高速直升机垂直飞行性能计算

Computation for Vertical Flight Performance of High Speed Helicopter Based on CFD Method

为了对共轴刚性旋翼高速直升机的飞行性能进行高精度预测,本文采用计算流体力学(CFD)方法建立旋翼以及机身的高精度气动力模型和需用功率模型,采用动量源方法计算旋翼/机身之间的干扰,并将干扰产生的附加载荷以垂直增重系数形式计入旋翼气动力,在旋翼操纵量配平情况下进行共轴刚性旋翼气动力与需用功率计算。在此基础上,考虑传动系统限制和旋翼失速限制对共轴刚性旋翼高速直升机的垂直飞行性能进行高精度计算与分析。结果表明,采用高精度的旋翼气动力CFD建模方法与配平策略,可以有效地保证共轴刚性旋翼高速直升机垂直飞行性能的计算精度。

In order to accurately predict the flight performance of high speed helicopter with coaxial rigid rotor configuration,CFD method with high precision is adopted to establish the aerodynamic force and required power models of rotor and fuselage.The momentum source method is employed to calculate the interaction between rotor/fuselage,and the additional load of fuselage due to the interaction is added to the aerodynamic force model of rotor in form of vertical weight,thus the aerodynamic force and required power of coaxial rigid rotor are calculated by trimming of manipulation.On these basis,by considering the strength limitation of the transmission system and the performance limitation caused by rotor stall,the vertical flight performances of the coaxial rigid rotor high speed helicopter are analyzed.The results indicate that the vertical flight performance of coaxial rigid rotor high-speed helicopter can be accurately obtained by using the high-precision rotor CFD method and trimming strategy.