2012 非定常 CFD 解析の活用によるファン騒音の低減

概要

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Unsteady three-dimensional Navier-Stokes CFD analysis has been performed to predict a fan noise source and to investigate noise source characteristics. Unsteady loading distribution on the stator surface predicted by CFD was compared with the results predicted by two-dimensional and three-dimensional linear theory. We can find that it is important to take into account a three-dimensional effect to predict unsteady loading. Acoustic power levels were calculated from predicted unsteady loading, and compared with experimental data. Noise level based on CFD analysis agreed with experimental data better than that based on three-dimensional linear theory. It is clear that CFD analysis has an advantage in noise source prediction. A mechanism of generating noise source distribution was investigate, and some parts of its mechanism come to be clear.
2002-09-20