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研究生:楊翰宗
研究生(外文):Young, Han-Tzong
論文名稱:陡坡光滑渠流水力特性之研究
論文名稱(外文):Flow Characteristics for Steep Channel Flow with Smooth Boundary
指導教授:盧昭堯盧昭堯引用關係
指導教授(外文):Lu Jau-Yau
學位類別:碩士
校院名稱:國立中興大學
系所名稱:土木工程學系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:2
中文關鍵詞:陡坡超臨界流
外文關鍵詞:steepsupercritical flow
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本實驗係採用光纖雷射杜卜勒測速儀(Fiber-optic Laser Doppler
Velocimetry,簡稱 FLDV)進行陡坡光滑床面之明渠流之流場特性研究
。實驗寬深比介於3.79與11.36之間; 光滑底床坡度分別為0.3%、1%及2%
;福祿數則介於0.96與2.72;雷諾數涵蓋 與 之範圍 。流場分二維與三
維討論之,且大部份實驗屬於超臨界流況(supercritical flow)。 文
中主要分析項目包括:平均速度剖面、紊流強度分佈及雷諾應力分佈等水
力特性。在 平均速度分佈方面,除分別與壁定理(law of the wall)
、速度欠損律(velocity defect law)、1/7冪次定理(one-
seventh power law)及邱氏流速分佈等流速分佈定 理做比較外,並針
對垂線最大流速發生於液面上與液面下之流速剖面進行深入探討。紊 流
強度分佈及雷諾應力分析則與Nezu & Rodi(1986)及Tominaga & Nezu
(1992)等之 結果進行比較,以研析流場之水力特性與機制。
另外,本研究亦對天然河川較窄之流況進行初步探討,發現隨寬深比的減
小,水流受邊 壁之影響漸增,最大流速發生位置有漸次下降之趨勢,且
各垂線流速分佈不能用對數公 式完全概括,此現象與室內實驗資料分析
結果頗為一致。
The Fiber-optic Laser Doppler Velocimetry (FLDV) was adopted in
this experimental study to investigate the
characteristics of the steep open channel flow over a
smooth boundary. In this study, the aspect ratio varied from
3.79 to 11.36, the Reynolds number varied from 10000 to 80000,
and the channel bed slope of 0.3%, 1% and 2% were selected.
Both two-dimensional and three-dimensional flow were discussed.
The Froude number ranged from 0.96 to 2.72, and most of the
experiments belonged to supercritical flow. The
objectives of this research were to study the mean velocity
profiles, the turbulence intensities, and the Reynolds stress of
the steep open channel flow.The measured velocity profiles
were compared with the law of the wall, the velocity defect
law, the one-seventh power law and Chiu''s velocity
theorem. The velocity profiles for conditions with the maximum
point velocity occurred above and below the water surface were
discussed. The measured distributions of the turbulence
intensities and the Reynolds stress were analyzed and
compared with the results of Nezu and Rodi (1986), and Tominaga
and Nezu (1992).
In addition, a preliminary study for the characteristics of the
deep narrow natural river flow was also performed. It was
found that the amount of depression of the point of
maximum velocity below the water surface increased with an
decrease of the aspect ratio (ratio of width to depth), which
was consistent with the results of the laboratory
experiment.
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