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羽根なしディフューザ内3次元剥離の乱流数値解析 : 数値解析と運動量積分法の比較(流体工学,流体機械)


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Title: 羽根なしディフューザ内3次元剥離の乱流数値解析 : 数値解析と運動量積分法の比較(流体工学,流体機械)
Other Titles: Computational Analysis of 3-D Turbulent Flow Separation in a Vaneless Diffuser : Comparison between Numerical Analysis and Momentum Integral Method
Authors: 石田, 正弘 / 坂口, 大作 / 孫, 自祥 / 植木, 弘信
Authors (alternative): Ishida, Masahiro / Sakaguchi, Daisaku / Sun, Zixiang / Ueki, Hironobu
Issue Date: 25-Mar-2004
Publisher: 社団法人日本機械学会 / The Japan Society of Mechanical Engineers
Citation: 日本機械学會論文集. B編, 70(691), pp.623-628; 2004
Abstract: Three dimensional flow separation occurring in a vaneless diffuser at small flow rates was analyzed by using the numerical simulation with the low Reynolds-number turbulence model (LRN k-ε) as well as the momentum integral method (MI). Comparison between the LRN k-ε calculation and the experiment indicates quite a good agreement in the 3-D boundary layer velocity profile. The numerical investigation shows that the LRN k-ε calculation can predict the reverse flow in the vaneless diffuser, while the MI-method behaves relatively poor although it captures the overall flow pattern correctly. It is clarified that a small gradient in the inlet tangential velocity distribution with respect to the diffuser depth is the key factor which dominates the reverse flow behavior in the vaneless diffuser at small flow rates, as demonstrated in the experiment.
Keywords: Vaneless Diffuser / Reverse Flow / Numerical Simulation / Momentum Integral Method
URI: http://hdl.handle.net/10069/22756
ISSN: 03875016
Relational Links: http://ci.nii.ac.jp/naid/110004999305/
Rights: 社団法人日本機械学会 / 本文データは学協会の許諾に基づきCiNiiから複製したものである
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/22756

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