Aerodynamic Design And Verification Of Tilting Rotor Propeller

The tilt-rotor aircraft concentrates the advantages of fixed-wing aircraft high-speed cruise and vertical take-off and landing of helicopters.Compared with ordinary helicopters,it has more excellent performance and is highly valued by the world’s major powers.As the propulsion device of the tilt-rotor aircraft,the tilt-rotor propeller is essential to design a tilt-rotor propeller with excellent aerodynamic performance.Compared with ordinary propellers,tilt-rotor propellers face more complicated aerodynamic problems,and aerodynamic design needs to take into account the different requirements of aerodynamic performance in both cruising and hovering states.Based on the research progress of aerodynamic design of tilt-rotor propellers at home and abroad,this paper analyzes the aerodynamic performance requirements of tilt-rotor propellers under cruising and hovering conditions.Based on propeller design theory,the aerodynamic design program for tilt-rotor propellers is developed.A rotary wing propeller was designed.Based on the Reynolds Averaged Navier-Stokes(RANS),computational fluid dynamics(Computational fluid dynamics,CFD)is used to calculate the tilting rotor propeller,and the grid factors and calculation conditions are analyzed to accurately simulate the tilting The influence of the flow field of the rotor propeller.CFD calculations are carried out on the cruise state and hovering state of the rotor propeller,and the aerodynamic parameters such as pulling force T,power P,efficiency η,pulling force coefficient CT,and power coefficient CP are obtained.The calculated value of CFD is compared with the experimental value: when the speed ratio is between 2.6 and 3.2 in the cruise state,the pulling force error is less than 3.3%,the power error is less than 6.4%,the efficiency error is less than 7.8%,and the highest cruise efficiency is 83.3%.The hovering state tension error is 1.4%smaller,the power error is less than 1.9%,the efficiency error is less than 3.4%,and the highest hovering efficiency is 68.7%.The research results show that the aerodynamic design of the tilt-rotor propeller in this paper has achieved a relatively ideal result,the CFD numerical calculation is highly reliable,and the obtained tilt-rotor propeller has ideal comprehensive high performance.