【摘要】：洞、渠組合的長距離泄流系統(tǒng)受大變幅水流條件的影響和局部邊界約束,沿程流態(tài)十分復雜,因此泄流安全的研究十分必要.本文借助水力模擬與理論分析,以某抽水蓄能電站水庫的明流泄洪洞、渠系統(tǒng)為例,研究了復雜運用條件的水力學特性.研究發(fā)現(xiàn)泄流過程中因邊界約束出現(xiàn)的洞內水躍使躍后緩流段過流能力劇減,引發(fā)洞內壅塞與明渠局部漫溢,出現(xiàn)水深隨流量改變呈駝峰曲線變化的泄流特異性.這一特異性與洞內水躍的發(fā)生及當?shù)氐牧鲬B(tài)轉換密切相關,表現(xiàn)為無量綱水深與水流Fr的波狀函數(shù)關系,相應的特征水深則隨Fr呈冪函數(shù)規(guī)律變化.針對洞內水躍引發(fā)的洞內壅塞與明渠漫溢等泄流安全問題,基于多目標、多約束條件的水力優(yōu)化分析,提出了"抑制洞內水躍強度、控制流量與流態(tài)協(xié)調性"的泄流運行原則,并據(jù)此對泄流系統(tǒng)進行了體型優(yōu)化.試驗研究表明通過調整泄流系統(tǒng)的縱橫剖面,協(xié)調各段的泄流能力與流態(tài),控制特殊部位的水流能量關系,可以有效削弱、控制局部邊界約束引發(fā)的泄流特異性,消除洞內壅塞,滿足復雜水流條件下的泄流安全要求.
[Abstract]:The long distance discharge system combined with tunnels and channels is affected by the large amplitude flow conditions and the local boundary constraints, and the flow along the stream is very complex, so it is necessary to study the safety of discharge. With the aid of hydraulic simulation and theoretical analysis, the hydraulic characteristics of complex operating conditions are studied by taking the open flow drainage tunnel and canal system of a reservoir of a pumped storage power station as an example. It is found that the water jump in the tunnel due to boundary constraints decreases the flow capacity of the slow flow section, causing congestion and local overflow of the open channel and the leakage specificity of the water depth changing with the flow rate. This specificity is closely related to the occurrence of the water jump in the hole and the local flow state transformation, showing that the dimensionless water depth is related to the wave function of water flow Fr, and the corresponding characteristic water depth changes with the law of power function. Aiming at the leakage safety problems caused by water jump in the tunnel, such as choking and overflow of open channel, based on the hydraulic optimization analysis of multi-objective and multi-constraint conditions, the principle of "restraining the intensity of hydraulic jump in the tunnel and controlling the coordination of flow and flow state" is put forward. Based on this, the shape optimization of the discharge system is carried out. The experimental results show that by adjusting the longitudinal and horizontal profile of the discharge system, coordinating the discharge capacity of each section with the flow pattern, and controlling the energy relationship of the flow in the special position, the discharge specificity caused by the local boundary constraints can be effectively weakened and controlled. The congestion in the tunnel is eliminated to meet the safety requirements of discharge under complicated flow conditions.
【作者單位】： 西安理工大學西北旱區(qū)生態(tài)水利工程國家重點實驗室培育基地;華北水利水電大學水力學及河流研究所;紹興市水利局;
【基金】：國家自然科學基金項目(51579206,51579013) 陜西省水利廳科技計劃項目(2017slkj-17)
【分類號】：TV135.2

【相似文獻】

相關期刊論文 前7條

1 朱文驊;許躍敏;葉貴如;;非線性邊界約束下梁的彎曲振動[J];固體力學學報;1990年02期

2 李正光;吳柏生;劉海峰;;結構邊界約束修改后的重分析方法[J];計算力學學報;2012年05期

3 胡平;丁彥慧;吳宏偉;蔡奇鵬;Paul Van Laak;;斷層同震錯動行為離心機模擬研究中的邊界條件處理方法探索[J];地球物理學進展;2013年05期

4 宋春明;王明洋;劉斌;;邊界約束對梁抗爆動力響應的影響(Ⅰ) 理論研究及分析[J];振動與沖擊;2014年05期

5 馮廣占;黃良;;有多種邊界約束復合材料層板承載力的計算與設計[J];成都科技大學學報;1985年02期

6 吳冰潔;彭香武;劉亮;王青占;郭興明;;多重邊界約束對三壁碳納米管振動特性的影響[J];上海大學學報(自然科學版);2014年02期

7 ;[J];;年期

相關會議論文 前1條

1 王志國;周來水;王小平;周儒榮;;材料力學模型在變形中的應用[A];幾何設計與計算的新進展[C];2005年

相關碩士學位論文 前2條

1 余權舟;雙軸壓縮荷載作用下豎向及旋轉彈性邊界約束復合材料板的屈曲研究[D];上海交通大學;2014年

2 賈登成;個人權利的“邊界約束”[D];西南政法大學;2015年

，

本文編號：2156040