Turbulent-wake-cascade interaction noise simulations using a hybrid sliding mesh method

Ying, Wei, Fattah, Ryu, Zhang, Xin and Gea-Aguilera, Fernando (2018) Turbulent-wake-cascade interaction noise simulations using a hybrid sliding mesh method. In 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. vol. 3, International Institute of Acoustics and Vibration. pp. 1358-1365 .

Abstract

Accurate predictions of broadband noise generated by fan-wake-OGV (Outlet Guide Vane) interaction remain challenging due to the wide range of acoustic and turbulent length-scales. Parameters such as the OGV vane thickness, fan wake structure, and advance ratio may affect the sound generation and propagation characteristics. A systematic study of these design parameters via full-scale and three-dimensional simulations is not convenient as it will inherit a significant computational cost. In this work, the fan and OGV geometry is represented as an unwrapped two-dimensional cascade with periodic upper and lower boundaries. A two-dimensional Euler solver with a hybrid sliding grid method is applied to account for the fan-OGV motion, and isotropic turbulence is synthesised and injected upstream of sliding surface to model the fan-wake. The numerical results are compared to an analytical model that is an extension of Amiet's flat-plate noise model to a cascade of flat plates.

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