軸流ターボ機械騒音の音響出力におよぼす位相の影響

概要

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This paper deals with the effect of linear phase variation on total acoustic power generated from an axial-flow turbomachinery. In a previous paper(J. Acoust. Soc. Jpn. (E)2, 203-211), the authors derived a simple expression on the power when all the fluctuating forces on rotor(or stator) blades are in phase. The expression is extended to the case where the phase of the fluctuations varies linearly with the circumferential distance. This is a model for turbomachines with different number of stator and rotor blades. It is shown that the Fourier components of the fluctuation contributing to the power are related to the phase variation and that the dependence of some parameters on the power has the same form as that where the fluctuations are in phase. Furthermore, it is suggested that the noise with discrete frequencies is emitted mainly from rotor blades not from stator ones. To obtain a further understanding an estimation of the fluctuation are made using a linear theory and important effects of blade geometry and flow configuration are pointed out.
社団法人日本音響学会の論文