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タイトル: 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
その他のタイトル: Suppression of Rotating Stall in Vaneless Diffuser by Wall Roughness Control
著者: 坂口, 大作 / 石田, 正弘 / 植木, 弘信 / 孫, 自祥
著者(別表記) : Sakaguchi, Daisaku / Ishida, Masahiro / Ueki, Hironobu / Sun, Zixiang
発行日: 2000年 8月25日
出版者: 日本機械学会
引用: 日本機械学會論文集. B編 66(648) p.2101-2108, 2000
抄録: 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.
キーワード: Centrifugal Blower / Rotating Stall / Vaneless Diffuser / 3-D Boundary Layer / Separation Control / Rough Wall
URI: http://hdl.handle.net/10069/6754
ISSN: 03875016
資料タイプ: Journal Article
原稿種類: publisher
出現コレクション:060 学術雑誌論文

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



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