对转开式转子气动设计方法

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.