Numerical Simulation of Aeroacoustics of Hovering Helicopter Rotor

[摘要] The specifics of the problem of estimating the noise of a hovering rotor, allows for some simplification of the Ffowcs Williams-Hawkins (FW-H) equation. Most published works dedicated to helicopter tonal noise estimates use the far-field formulation. This paper estimates the aeroacoustic emissions of a helicopter rotor in hover, for observers placed at different distances using the FW-H equation, including near-field and far-field terms. The blade pressure distribution is obtained from numerical simulations with the RANS equations. To demonstrate this approach, the near- and far-field contributions are analyzed for the model-scale UH-1H main helicopter rotor. For the numerical simulations, the HMB solver of Glasgow University and the ANSYS Fluent13 commercial solver are used. As the rotor blade behaviour is characterized by a complex motion in the computer program it is assumed that the blade is seen in as a rotating rigid body. The most commonly used mathematical model of the FW-H equation corresponds to the classical impermeable formulation. In this case, the source surface corresponds to the blade surface. Then, the acoustic pressure (based on the FW-H 1A formulation) is modified with empirical adjustments, based on the radiation Mach number. This was applied for the near- or far-field thickness noise depending on the rotor-observer distance.

[发布机构] Department of Aerohydrodynamics, KNRTU-KAI, 10 K. Marx str., Kazan; 420111, Russia^1;James Watt South Building, School of Engineering, University of Glasgow, G12 8QQ, United Kingdom^2

[效力级别] 无线电电子学 [学科分类] 航空航天科学

[关键词] Acoustic pressures;Commercial solvers;Complex motion;Glasgow University;Helicopter rotor in hovers;Hovering rotor;Rotating rigid body;Thickness noise