ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Parameter effects analysis on aerodynamic and aeroacoustic characteristics of coaxial rigid rotor
Received date: 2023-04-11
Revised date: 2023-05-15
Accepted date: 2023-07-03
Online published: 2023-07-07
Supported by
National Natural Science Foundation of China(11972190)
The coaxial rigid rotor helicopter is an essential direction for the development of high-speed helicopters in the future. This paper studies the flow field of Blade-Vortex Interaction （BVI） and aeroacoustics characteristics of the coaxial rigid rotor helicopter during forward flight and explores the influence of parameter variations on its aerodynamic and aeroacoustics characteristics. To capture the rotor wake flow field accurately， a high-precision calculation method for the flow field of a coaxial rigid rotor helicopter is proposed. The method employs the Reynolds-Averaged Navier-Stokes （RANS） equation as the governing equation， adopts the fifth-order WENO-Z scheme to reconstruct the state variables， and simulates the motion of rotor blades using a moving overset grid system. Furthermore， a rotor noise calculation method based on Farassat 1A formula， which has high precision in capturing rotor BVI noise， is also utilized. By using those methods， the flow field of single isolated rotor， coaxial rotor without fuselage and coaxial rotor with fuselage are calculated and compared， and the effects of rotor self-BVIs， interference between rotors， and fuselage interference on the aerodynamic and aeroacoustics characteristics of the coaxial rigid rotor are studied. Additionally， the influence of different geometric parameters on the aerodynamic and aeroacoustics characteristics of the coaxial rigid rotor are calculated and analyzed， and new conclusions are obtained.
Qi LIU , Yongjie SHI , Zhiyuan HU , Guohua XU . Parameter effects analysis on aerodynamic and aeroacoustic characteristics of coaxial rigid rotor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(9) : 528856 -528856 . DOI: 10.7527/S1000-6893.2023.28856
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