Abstract
AbstractA CFD method for whole aircraft aerodynamic interactions of the quad-tiltrotor is established, where the momentum source method is adopted for the simulation of the rotor flowfield, and the body-fitted grid method is employed for the simulation of the fuselage. Based upon the established CFD method, the aerodynamic interaction characteristics between the front rotor/rear rotor/wing of the quad-tiltrotor under forward and transition flight state are studied, and the effects of rotor diameter, RPM, and forward flight speed on aerodynamic interaction characteristics of quad-tiltrotor are analyzed. The numerical results show that the use of rotors with large diameter may not be able to meet the performance requirements in high-speed cruise, and the aerodynamic efficiency of the rear rotor is slightly higher. As the diameter and RPM decrease, the differences of aerodynamic efficiency for the front and rear rotors decrease. When the forward speed and the tilt angle of the rotors are small, the efficiency of the rear rotor is lower than that of the front rotor, and the interferences between rotors weaken with increasing rotor diameter and RPM.KeywordsQuad-tiltrotorVariable RPMVariable diameterAerodynamic interactionsMomentum source method
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