行政院國家科學委員會專題研究計畫成果報告:束縮段渠道超臨界流水理分析
Date Issued
2000
2000-07-31
Date
2000
2000-07-31
Author(s)
許銘熙
DOI
892211E002049
Abstract
The contraction channel connecting upstream and downstream channels is designed for reducing the energy lose of water flow. When the inflow condition is supercritical flow, the flow in channel contraction will generate oblique shock waves, and make the downstream flow unstable. However, the large channel contraction ratio will generate the choking flow. In this study, the theoretical analyses for the choking flow and suitable length of transition in straight-wall channels are
investigated. The non-dimensional parameters affecting the water depth in rectangular contraction channel are deduced from the dimensional analysis. In addition, a two-dimensional numerical model was developed to simulate supercritical flow in channel contractions. A series of numerical experiments were carried out to analyze the effects of the non-dimensional parameters. As a result, the suitable lengths of the channel contraction are proposed to reduce the influence on the downstream flow field. The results of this study can be used for the hydraulic analysis and design of channel contractions in supercritical flow.
Subjects
Channel Contractions
Suitable Length
Oblique Shock Waves
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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