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羽根なしディフューザ壁面の部分的粗面化による旋回失速の抑制


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Title: 羽根なしディフューザ壁面の部分的粗面化による旋回失速の抑制
Other Titles: Suppression of Rotating Stall in Vaneless Diffuser by Wall Roughness Control
Authors: 坂口, 大作 / 石田, 正弘 / 植木, 弘信 / 孫, 自祥
Authors (alternative): Sakaguchi, Daisaku / Ishida, Masahiro / Ueki, Hironobu / Sun, Zixiang
Issue Date: 25-Aug-2000
Publisher: 日本機械学会
Citation: 日本機械学會論文集. B編 66(648) p.2101-2108, 2000
Abstract: The authors have proposed a new technique to suppress successfully the rotating stall in the vaneless diffuser. By positioning the completely rough wall between R=1.2 and 1.6 on the hub side diffuser wall alone, the flow rate of rotating stall inception was decreased by 42% at a small pressure drop less than 1% of the blower pressure rise. This is based on that the local reverse flow occurs firstly at the hub side in most centrifugal blowers with backswept blade impeller mainly depending on the distortion of tangential component of inlet main-flow velocity. The 3-D boundary layer calculation shows that the local reverse flow is decreased remarkably by an increase in wall friction, and it disappears if the friction coefficient is 0.01 about twice of the smooth wall. By analyzing the effect of wall friction and turbulence induced by the rough wall, it is clearly shown that the rough wall positioned in the limited region, where the wall-limiting streamline flow angle shows the negative maximum, is quite effective to suppress the rotating stall at a small drop of the diffuser pressure recovery.
Keywords: Centrifugal Blower / Rotating Stall / Vaneless Diffuser / 3-D Boundary Layer / Separation Control / Rough Wall
URI: http://hdl.handle.net/10069/6754
ISSN: 03875016
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/6754

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