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半導体レーザ2焦点流速計による遠心送風機旋回失速の計測 : 第1報,速度変動の翼間分布計測

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Title: 半導体レーザ2焦点流速計による遠心送風機旋回失速の計測 : 第1報,速度変動の翼間分布計測
Other Titles: Measurement of Rotating Stall in a Centrifugal Blower by Semiconductor Laser 2-Focus Velocimeter : 1st Report, Measurement of Blade-to-Blade Distribution of Velocity Fluctuation
Authors: 坂口, 大作 / 石田, 正弘 / 植木, 弘信 / Surana, Taufan
Authors (alternative): Sakaguchi, Daisaku / Ishida, Masahiro / Ueki, Hironobu / Surana, Taufan
Issue Date: 25-Mar-1994
Publisher: 日本機械学会
Citation: 日本機械学會論文集. B編 60(571) p.899-904, 1994
Abstract: For detecting the rotating stall observed at a low flow rate in a centrifugal blower with a backward-leaning blade impeller, blade-to-blade variation of velocity fluctuation was measured in the impeller, immediately downstream of the impeller and in the vaneless diffuser. Measurement was conducted by means of the spot-focus-type semiconductor laser 2-focus velocimeter developed by the authors. This L2F velocimeter has a narrow-band spatial-filter effect within ±1.5 degrees of flow angle fluctuation. The fluctuations of velocity and flow angle were analyzed on the basis of the probability density distribution. The change of the blade-to-blade relative velocity distribution due to flow rate was clearly shown, and it was determined that the origin of rotating stall was in the vaneless diffuser because the blade-to-blade velocity fluctuation distribution in the impeller was hardly affected by the large velocity fluctuation due to the rotating stall which occurred in the vaneless diffuser.
Keywords: Fluid Machine / Centrifugal Blower / Vaneless Diffuser / Rotating Stall / Laser 2-Focus Velocimeter / Velocity Fluctuation Intensity
URI: http://hdl.handle.net/10069/6743
ISSN: 03875016
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/6743

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