sliding grid simulation of cascade noiseaantc.ust.hk/team/poster_yingwei/ying.pdf · and have...
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Project supervisor and contact
Zhang, Xin (aexzhang@ust.hk )
Swire Professor of Aerospace Engineering, Chair Professor
Department of Mechanical and Aerospace Engineering
Aerodynamics Acoustics &
Noise Control Technology Centre
aantc.ust.hk
Sliding grid simulation of cascade noise
Wei Ying and Ryu Fattah
Effect of advance ratio J on PWL
The wake rotation speed has no significant effect on the noise generatedby the cascade, due to the similar levels of averaged turbulence intensityacross each case. This will remain true, as long as the separationbetween adjacent wakes is a constant.
Aim
The rotational motion of the fan blades was considered, by applying ahigh-order hybrid sliding interface between the turbulence injectionregion and the OGVs.The effect of the advance ratio and turbulence properties of the fan-wakes, such as the wake width and turbulent integral length scale, onthe sound power level, were investigated. The sound power levelobtained are compared to analytical predictions.
Acknowledgements
Ying Wei is supported by a PhD fellowship. This study is supported by Hong Kong Research Grant Council (RGC) grants [projects 16204316 and 16203817].
Background
Turbofan engines are commonly used on modern commercial aircraftsand have become a significant source of noise pollution. The tonal noisegenerated by turbofan engines has been extensively studied, and noisereduction approaches such as acoustic liners have been developed. Thedominant source of broadband noise is due to the turbulent fan-wakeinteracting with the leading edges of the outlet guide vanes (OGV).
Upstream PWL Downstream PWL
Vorticity magnitude (J=1.25)Instantaneous p’ (J=1.25)
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