K-1246 3次元CFD段解析を用いたファン騒音音源分布予測(J06-6 流体関連の騒音と振動(6))(J06 流体関連の騒音と振動)

概要

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Three-dimensional unsteady flow analysis is conducted to predict unsteady pressure fluctuation on fan stator surface which can be the main source of fan noise. FFT analysis shows that blade passing frequency (BPF) and its higher order are dominant in the pressure fluctuation due to rotor-stator interaction. It is also found that large pressure fluctuation appears not only around L. E. but also around mid-chord of tip and mid-span. Acoustic waves generated on stator surface and propagated through fan duct are analyzed by lifting surface theory with the numerical results. The magnitude of acoustic mode composing each harmonic is predicted successfully.
2001-08-22