IGTC-30 Blade Passing Frequency Noise Induced by Flow around Cut-Off of Scroll in a Centrifugal Fan(Session A-9 UNSTEADY AERODYNAMICS III)

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概要

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• Speed dependent characteristics of the centrifugal fan noise are discussed by introducing a wave transmission model through the impeller and the inlet. The measured data at the fan inlet are decomposed into source strength terms and a frequency response term. By setting the exponent in a power law relationship of the sound pressure level versus rotational speed as 3, i.e. a dipole source, the other two factors contributing the source strength are determined in a simple relationship to the distance between the scroll cut-off and the impeller. The frequency response is satisfactorily predicted by introducing a one-dimensional linear wave model ; where the key passage is the blade-to-blade passages selectively determined by the noise wave length. The source pressure fluctuation leading the blade passing frequency noise radiation is the fluctuation distributed around the scroll cut-off, and any other significant sources are not recognized within the casing. The flow field is discussed by a 3-dimensional flow computation.

• 公益社団法人日本ガスタービン学会の論文

著者

• Outa E.

  Department Of Mechanical Engineering Waseda University

• Tajima K.

  Department of Mechanical Engineering, Waseda University

• Ohta Y.

  Waseda University

• Tajima K.

  Department Of Mechanical Engineering Waseda University

関連論文

• IGTC-14 An Acoustic Model for Prediction of Centrifugal Blower Noise Induced by Blade Discharge Flow around the Scroll Cut Off(Session A-6 NOISE AND PRESSURE FLUCTUATION)
• IGTC-30 Blade Passing Frequency Noise Induced by Flow around Cut-Off of Scroll in a Centrifugal Fan(Session A-9 UNSTEADY AERODYNAMICS III)
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