Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/72288
標題: 煙囪式出流口滯洪壩流量公式之實驗研究
作者: 陳正炎
洪耀明
黃宏信
關鍵字: 白努利方程式
有效流量係數
煙囪式出流口
出版社: 國立中興大學工學院;Airiti Press Inc.
摘要: The theoretical and experimental analysis were used for this research to investigate the discharge formula of detention dam with chimney outlet on hillslope. The outlet control section combine upper rectangle with inferior trapezoid. Theoretical discharge formulas were obtained from Bernoulli's equation, with the effective discharge coefficient for adjustment. Effective discharge coefficient and experimental discharge formulas were obtained by using the experiment of different chimney outlets. Under 5% channel bed slope, the discharge formulas of compound outlets with metric system are outlined as follows: (1) The water depth fall into trapezoidal section Q=2/3(0.505)2g { bh-4/5mh }( 0 ≦ h ≦ p ) (2) The water depth above trapezoidal section Q=2/3(0.505)2g { bh-4/5m 〔 h+(h-p) 〕}( p < h ≦ H ) where Q(cms) is the discharge of outlet, h is the water depth of outlet, g is gravitational acceleration, b is the breadth at bottom of trapezoidal section, p is the height of trapezium, side slopes of m (horizontal): 1 (vertical) of the trapezoidal section, H is the height of outlet control section.
本文旨在針對山坡地滯洪設施中,有關煙囪式出流口之流量公式做理論與實驗之 研究。所用之出流口係採上方矩形下方梯形斷面形狀之設計,並依據白努利方程式解析,引 入有效流量係數 Ce 為校正參數,推得理論流量公式;再配合不同梯形開口尺度進行渠槽試 驗,推算有效流量係數,提出實驗室經驗流量公式,期為山坡地開發設置滯洪設施之設計參 考。經由理論推導與實驗數據分析,獲致在渠床坡度 5% 之煙囪式出流口公制流量公式如下 :(1)當水深位於梯形斷面內時 Q=2/3(0.505)2g { bh-4/5mh }( 0 ≦ h ≦ p ) (2)當水深高於梯形而達矩形斷面時 Q=2/3(0.505)2g { bh-4/5m 〔 h+(h-p) 〕}( p < h ≦ H ) 式中Q( cms )為出流口流量,h 為出流口水深, g 為重力加速度,b、p、m 分別為梯形 斷面之底寬、高度及側坡水平比值,H 為出流口斷面最大高度。
URI: http://hdl.handle.net/11455/72288
ISSN: 1017-4397
Appears in Collections:第10卷 第3期
工學院

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