对转开式转子气动设计方法

Aerodynamic design method of contra-rotating open rotor

提出一种基于升力线理论的对转开式转子(contra-rotating open rotor,CROR)气动设计方法。以推力为设计目标,基于拉格朗日乘子法构建气动设计控制方程组。考虑高飞行马赫数对流动特征的影响,根据激盘模型,采用一道正激波模拟转子的增压过程。完成速度场预测后,利用压气机三维造型方法完成初始设计。初始设计完成后,对翼型折转角进行修正从而满足目标推力。研究表明,整个设计过程中只需2次计算流体力学(CFD)计算与再设计便可满足目标推力,所需翼型折转角修正量为−0.486°,设计结果的推力与目标推力的相对误差为−0.32%,设计方法高效且具有高的设计精度。

An aerodynamic design method of contra-rotating open rotor(CROR)based on lifting line theory was proposed.Utilizing Lagrange multiplier method,the aerodynamic design control equation of CROR was constructed to find the CROR meeting the thrust demand.Due to the influence of high flight Mach number on the flow characteristics,a positive shock wave was used to simulate the pressure rising process of rotor according to the actuator disk model.Based on the predicted velocity field,preliminary design of CROR was completed utilizing three-dimensional modeling method of compressor.After the preliminary design,turning angle was corrected to meet the thrust demand.The results showed that only two computational fluid dynamics(CFD)calculations and redesign in the whole design process were required to meet the thrust demand.The required turning angle correction was−0.486°.The relative error between design result and thrust demand was−0.32%.The design method was efficient and had good design accuracy.