本文選題：調(diào)水系統(tǒng) + 閘前溢流井��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：在有壓管路中,由于閥門突然關(guān)閉、水泵機(jī)組突然停車等原因使水流速度發(fā)生突變,從而引起壓強(qiáng)急劇升高和降低的交替變化,這種變化以一定速度向上游或下游傳播,并且在邊界上發(fā)生反射,這種水力現(xiàn)象稱為水錘。水錘可導(dǎo)致管道系統(tǒng)強(qiáng)烈震動產(chǎn)生噪聲,可能破壞管道、水泵、閥門設(shè)施,并引起水泵反轉(zhuǎn),管網(wǎng)壓力降低等不利現(xiàn)象,在長距離調(diào)水系統(tǒng)中水錘的危害尤甚。在長距離調(diào)水系統(tǒng)中,閘前設(shè)置溢流井可以有效控制長距離輸水系統(tǒng)在啟閉過程中的水錘壓力波動。為了分析閘前溢流井在長距離調(diào)水隧洞中水錘防護(hù)的特性,并對閘前溢流井的體型和參數(shù)進(jìn)行優(yōu)化設(shè)計,本文采用理論分析與數(shù)值模擬相結(jié)合的方法,建立了包含閘前溢流井的長距離調(diào)水系統(tǒng)的水錘計算模型。通過數(shù)值建模和編程計算,對長距離輸水隧洞中采用通氣孔和閘前溢流井聯(lián)合控制水錘的特性進(jìn)行了模擬,獲得了不同運行情況下通氣孔和閘前溢流井的非恒定涌浪過程,全線極值壓力分布。比較了有無設(shè)置閘前溢流井時,沿程通氣孔的涌浪特性和全線極值壓力分布,分析了閘前溢流井對長距離調(diào)水系統(tǒng)的水錘防護(hù)作用。為了優(yōu)化閘前溢流井的設(shè)計,對溢流井高度、糙率系數(shù)、閘前溢流井的平面位置、輸水管道的內(nèi)徑、溢流井的截面積等進(jìn)行了敏感性分析,分析了各個參數(shù)對全線極值壓力分布、溢流流量和溢流持續(xù)時間的影響。本文的研究結(jié)果表明,通過設(shè)置閘前溢流井,可以良好控制通氣孔的涌浪高度和全線的水錘極值壓力。溢流井的高度和輸水管道內(nèi)徑是影響全線極值壓力分布最主要因素。在一定范圍內(nèi),降低溢流井的高度,全線極值壓力相應(yīng)減小,但溢流井的溢流流量和歷時會增加;增加輸水管道內(nèi)徑,可以減小全線極值壓力,同時也可以減小溢流井的溢流流量和歷時。在長距離隧洞輸水系統(tǒng)中,可以通過增加輸水管道內(nèi)徑和減小溢流井的高度來控制全線極值壓力的分布,調(diào)節(jié)溢流井的溢流過程。
[Abstract]:In a pressurized pipeline, the sudden closure of the valve and the sudden shutdown of the pump unit cause sudden changes in the velocity of the flow of water, resulting in a sharp rise and decrease in the pressure, which propagates at a certain speed upstream or downstream. And reflection occurs at the boundary, a hydraulic phenomenon called a water hammer. Water hammer can lead to strong vibration of pipeline system produce noise, may destroy pipeline, water pump, valve facilities, and cause adverse phenomena such as reverse of water pump, reduction of pipe network pressure, etc. The harm of water hammer is especially serious in long distance water transfer system. In the long distance water transfer system, the water hammer pressure fluctuation in the long distance water conveyance system can be effectively controlled by setting an overflow well in front of the sluice. In order to analyze the characteristics of water hammer protection in long distance diversion tunnel, and to optimize the shape and parameters of overflow well in front of sluice, the method of combining theoretical analysis and numerical simulation is used in this paper. The water hammer calculation model of long distance water transfer system including sluice overflow well is established. Through numerical modeling and programming calculation, the characteristics of water hammer controlled by ventilation hole and overflow well in front of gate in long distance water conveyance tunnel are simulated, and the unsteady surge process of ventilation hole and overflow well in front of sluice is obtained under different operation conditions. The whole line extreme pressure distribution. In this paper, the characteristics of surge wave and the pressure distribution of the whole line extreme value are compared when there is a pre-sluice overflow well, and the water hammer protection effect of the overflow well in front of the sluice on the long distance water transfer system is analyzed. In order to optimize the design of the overflow well in front of the sluice, the sensitivity of the overflow well height, roughness coefficient, the plane position of the overflow well in front of the sluice, the inner diameter of the pipeline and the cross section area of the overflow well are analyzed. The effects of various parameters on the pressure distribution, overflow flow and overflow duration of the whole line are analyzed. The results show that the surge height of the ventilation hole and the maximum pressure of the water hammer can be well controlled by setting the overflow well in front of the sluice. The height of the overflow well and the inner diameter of the pipeline are the most important factors affecting the extreme pressure distribution of the whole line. In a certain range, if the height of overflow well is reduced, the maximum pressure of the whole line will decrease correspondingly, but the overflow flow rate and duration of overflow well will increase, and the maximum pressure of the whole line can be reduced by increasing the inner diameter of the pipeline. At the same time, the overflow flow and duration of overflow well can be reduced. In the long distance tunnel water conveyance system, the distribution of extreme pressure can be controlled by increasing the inner diameter of the pipeline and reducing the height of the overflow well, and the overflow process of the overflow well can be adjusted.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV672.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馮建軍;武樺;吳廣寬;郭鵬程;羅興，

本文編號：2080435