11408 遠心羽根なしディフューザにおいて旋回失速初生直前に発生する壁面静圧変動(流体工学(2))

概要

論文の詳細を見る
The operation range of a centrifugal compressor or blower at low flow rate is limited by self-excited oscillation in the diffuser called rotating stall that causes sudden performance drop. One of the main characteristics of this phenomenon is pressure fluctuation that varies in various patterns. There is a pressure fluctuation even before the onset of rotating stall, which is weak and its intensity is not stable. In this study herein, simultaneous multiple static pressure measurements were held with pressure transducers in entire diffuser at the flow rate just before rotating stall generates. For analyzing various signal processing methods were used; continuous wavelet analysis, cross spectrum analysis and phase-locked ensemble-averaging technique. As result, aspects of the pressure field just before the onset of rotating stall is clarified.
社団法人日本機械学会の論文
2007-03-15