Affiliation of Author(s):航空学院

Journal:Hangkong Xuebao

Abstract:The rotor spacing of the coaxial rigid rotor helicopter is relatively small, and the complex aerodynamic interference between rotors could affect flight dynamic characteristics of the helicopter. To overcome this problem, this paper utilizes the vortex ring dynamic wake method to build the aerodynamic model for the coaxial rotor. The accuracy of the model is assessed by a comparison with a set of wind tunnel experimental data. A model for the flight dynamics of the coaxial rigid rotor helicopter is built based on the aerodynamic model mentioned above. The trim characteristics of the XH-59A helicopter with the forward speed 0-0.4 are calculated with the model. The results obtained with the model are consistent perfectly with flight test data, and the model is quick enough for flight dynamic calculation. Analysis of trim characteristics and the motion of the rotor wake shows that the aerodynamic interference between rotors increases the trim collective and collective differential in hover and low-speed forward flight, and the aerodynamic interference between rigid rotors causes a negative gradient of longitudinal trim along with forward speed. © 2018, Press of Chinese Journal of Aeronautics. All right reserved.

ISSN No.:1000-6893

Translation or Not:no

Date of Publication:2018-03-25

Co-author:Yuan, Ye,LIPAN

Correspondence Author:crl