Numerical Calculations of Aerodynamic and Acoustic Characteristics for Scissor Tail-Rotor in Forward Flight  

作　　者：Fan Feng Huang Shuilin Lin Yongfeng 

机构地区：[1]China Helicopter Research and Development Institute,Aviation Industry Corporation of China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2016年第3期285-293,共9页南京航空航天大学学报（英文版）

摘　　要：The aerodynamic and aeroacoustic characteristics of a scissor tail-rotor in a forward flight are numerically calculated.A novel computational fluid dynamics(CFD)model based on Navier-Stokes(N-S)equations is presented to simulate the unsteady flowfield and the aerodynamic characteristics of a scissor tail-rotor in the forward flight.Then the Farassat Formulation 1 Aderived from the FW-H equation is coupled into the CFD model in order to compute the aeroacoustic characteristics of the scissor tail-rotor.In addition,two different scissor tail-rotor configurations,i.e.,the L-and U-configuration,are analyzed in details and compared with a conventional one.The influence of scissor angles on the aerodynamic and aeroacoustic characteristics of the scissor tail-rotor is also investigated.The simulation results demonstrate that the flowfield,aerodynamic force and aeroacoustic characteristics of a scissor tail-rotor are significantly different from the conventional one,and the aerodynamic interaction decreases with the increase of scissor angle,which leads to a reduction of amplitude variation of the tail-rotor thrust in the forward flight.The scissor angle has an important effect on the aerodynamics and aeroacoustics of the scissor tail-rotor.The aerodynamic and aeroacoustic characteristics of a scissor tail-rotor in a forward flight are numerically calculated. A novel computational fluid dynamics （CFD） model based on Navier-Stokes （N-S） equations is presen- ted to simulate the unsteady flowfield and the aerodynamic characteristics of a scissor tail-rotor in the forward flight. Then the Farassat Formulation 1A derived from the FW-H equation is coupled into the CFD model in order to compute the aeroacoustic characteristics of the scissor tail-rotor. In addition, two different scissor tail-rotor configurations, i. e. , the L- and U-configuration, are analyzed in details and compared with a conventional one. The influence of scissor angles on the aerodynamic and aeroacoustic characteristics of the scissor tail-rotor is also investigated. The simulation results demonstrate that the flowfield, aerodynamic force and aeroacoustic characteristics of a scissor tail-rotor are significantly different from the conventional one, and the aerodynamic interaction decreases with the increase of scissor angle, which leads to a reduction of amplitude variation of the tail-rotor thrust in the forward flight. The scissor angle has an important effect on the aerodynamics and aeroacoustics of the scissor tail-rotor.

关 键 词：computational fluid dynamics(CFD) scissor tail-rotors aerodynamic characteristics aeroacoustic characteristics Navier-Stokes(N-S)equations 

分 类 号：V211.52[航空宇航科学与技术—航空宇航推进理论与工程]