Verification of Hybrid DES-FW-H Method for Estimation of Discharge Noise Induced by Turbine Cooler

Abstract Turbine cooler is the dominant cabin noise source of air conditioning system during aircraft ground and flight operation. The noise impact on passengers’ health can no longer be ignored, so modern commercial aircraft air conditioning system must meet low noise requirements. In this paper, turbine cooler transient flow field was calculated by detached-eddy simulation (DES), and its discharge noise is investigated using FW-H theory. The simulation analysis results and test data show that computational aeroacoustics (CAA: DES and FW-H combined method) can effectively capture the turbine cooler discharge noise level. The authors also present details related to the contribution of its blade passing frequency (BPF) and turbulence noise.