本文選題：過渡過程 + 特征線法��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：水電站在運(yùn)行過程中,由于事故或其它多種原因造成機(jī)組甩負(fù)荷,導(dǎo)致機(jī)組導(dǎo)葉開度迅速變化,進(jìn)而引發(fā)蝸殼內(nèi)水壓力、調(diào)壓室水位、機(jī)組轉(zhuǎn)速等參數(shù)的強(qiáng)烈波動(dòng),對(duì)電站的安全運(yùn)行造成嚴(yán)重影響。因此,開展水電站水力過渡過程的研究是十分必要的。本文根據(jù)過渡過程數(shù)值計(jì)算的基本原理和實(shí)用計(jì)算方法,結(jié)合工程實(shí)際,進(jìn)行了長(zhǎng)引水式水電站水力過渡過程研究,主要內(nèi)容包括:(1)利用特征線法,建立了水電有壓引水系統(tǒng)水力過渡過程的數(shù)學(xué)分析模型,及多種邊界條件,包括進(jìn)口邊界、阻抗式調(diào)壓室邊界、分岔管邊界以及水輪機(jī)邊界等,實(shí)現(xiàn)了電站引水系統(tǒng)中水擊壓力波動(dòng)與調(diào)壓室內(nèi)水位波動(dòng)的聯(lián)合計(jì)算。(2)從某一長(zhǎng)引水式水電站實(shí)例出發(fā),對(duì)導(dǎo)葉的關(guān)閉規(guī)律進(jìn)行了優(yōu)化,確定了最佳的導(dǎo)葉折線關(guān)閉規(guī)律;并通過改變導(dǎo)葉的有效關(guān)閉時(shí)間,探討了在長(zhǎng)引水式水電站中,導(dǎo)葉關(guān)閉時(shí)間與蝸殼末端最大壓力的關(guān)系。(3)對(duì)水電站的大波動(dòng)過渡過程進(jìn)行了計(jì)算,得出了機(jī)組轉(zhuǎn)速與蝸殼未端壓力的變化過程、調(diào)壓室內(nèi)水位的波動(dòng)過程以及隧洞沿線的壓力分布。其計(jì)算結(jié)果表明:在長(zhǎng)引水式水電站的大波動(dòng)過渡過程程中,由于其管道內(nèi)水流慣性較大,導(dǎo)致調(diào)壓室內(nèi)的水位波動(dòng)周期長(zhǎng)且振幅大,蝸殼末端的壓力波動(dòng)出現(xiàn)了明顯的主波與尾波之分。(4)對(duì)水電站水力干擾過渡過程進(jìn)行了計(jì)算,結(jié)果表明:在長(zhǎng)引水式水電站中,當(dāng)同一水力單元的部分機(jī)組丟全部負(fù)荷后,調(diào)壓室內(nèi)的水位波動(dòng)將在很長(zhǎng)時(shí)間內(nèi)對(duì)其它運(yùn)行中的機(jī)組產(chǎn)生影響。但是即便如此,調(diào)壓室水位波動(dòng)的衰減趨勢(shì)還是十分明顯的,證明該引水發(fā)電系統(tǒng)在選取的計(jì)算工況下是穩(wěn)定的。
[Abstract]:During the operation of the hydropower station, the load shedding of the unit is caused by accident or many other reasons, which leads to the rapid change of the guide vane opening degree of the unit, which leads to the strong fluctuation of the parameters such as the water pressure in the volute, the water level of the regulating chamber, the rotational speed of the unit, and so on. It has a serious effect on the safe operation of the power station. Therefore, it is necessary to study the hydraulic transition process of hydropower station. In this paper, according to the basic principle and practical calculation method of numerical calculation of transition process, combined with engineering practice, the hydraulic transition process of long diversion hydropower station is studied. The main content includes the use of characteristic line method. The mathematical analysis model of hydraulic transition process of hydropower pressurized water diversion system is established, and a variety of boundary conditions, including inlet boundary, impedance surge chamber boundary, bifurcation tube boundary and turbine boundary, are established. The combined calculation of surge of water hammer pressure and fluctuation of water level in regulating chamber in water diversion system of power station is realized. Based on an example of a long diversion hydropower station, the closure law of guide vane is optimized, and the best closing law of broken line of guide vane is determined. By changing the effective closing time of the guide vane, the relationship between the guide vane closing time and the maximum pressure at the end of the volute is discussed. The variation process of rotating speed and unend pressure of volute, the fluctuation process of water level in the surge chamber and the pressure distribution along the tunnel are obtained. The calculation results show that in the large wave transition process of long diversion hydropower station, because of the large inertia of water flow in the pipeline, the fluctuation period of water level in the surge chamber is long and the amplitude is large. The pressure fluctuation at the end of the volute case appears obvious main wave and coda wave. The transient process of hydraulic disturbance of hydropower station is calculated. The results show that in the long diversion type hydropower station, when part of the unit of the same hydraulic unit loses its full load, The fluctuation of water level in the surge chamber will affect other units in operation for a long time. But even so, the attenuation trend of water level fluctuation in the surge chamber is very obvious, which proves that the system is stable under the selected calculation conditions.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV732

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳捷平;楊建東;郭文成;滕毅;;超長(zhǎng)引水隧洞水電站調(diào)壓室水力設(shè)計(jì)的探討[J];武漢大學(xué)學(xué)報(bào)(工學(xué)版);2016年02期

2 洪振國(guó);劉浩林;;水電站調(diào)壓井特征線法水力計(jì)算研究[J];中國(guó)農(nóng)村水利水電;2015年04期

3 徐曉燕;張曉宏;李建斌;;水輪機(jī)導(dǎo)葉關(guān)閉過程的探討研究[J];電網(wǎng)與清潔能源;2015年02期

4 王超;楊建東;;連接管長(zhǎng)度對(duì)調(diào)壓室穩(wěn)定面積和小波動(dòng)調(diào)節(jié)品質(zhì)的影響[J];水力發(fā)電學(xué)報(bào);2015年01期

5 陳玲;鞠小明;楊濟(jì)鋮;;水電站調(diào)壓室涌浪水位多種計(jì)算方法比較[J];中國(guó)農(nóng)村水利水電;2013年09期

6 孫美鳳;王佳;殷晶;;長(zhǎng)引水系統(tǒng)電站過渡過程數(shù)字仿真[J];水利科技與經(jīng)濟(jì);2013年03期

7 樊紅剛;崔赫辰;陳乃祥;;導(dǎo)葉關(guān)閉規(guī)律非線性評(píng)價(jià)函數(shù)及多工況優(yōu)化[J];排灌機(jī)械工程學(xué)報(bào);2013年03期

8 齊學(xué)義;周俊;汪瑋華;周慧利;晁文雄;鄭琦;;水電站調(diào)節(jié)保證計(jì)算中導(dǎo)葉關(guān)閉規(guī)律探討[J];價(jià)值工程;2012年26期

9 饒柏京;宋春華;;引水式水電站上下游調(diào)壓室設(shè)置條件探討[J];人民長(zhǎng)江;2012年10期

10 王明鋒;;海甸峽水電站調(diào)壓室穩(wěn)定斷面選定及其涌波計(jì)算[J];水利規(guī)劃與設(shè)計(jì);2011年03期

相關(guān)碩士學(xué)位論文 前6條

1 范偉源;基于MATLAB的水電站過渡過程仿真分析[D];西北農(nóng)林科技大學(xué);2012年

2 趙正飛;水電站長(zhǎng)有壓引水系統(tǒng)水力過渡過程若干問題的計(jì)算研究[D];西安理工大學(xué);2010年

3 畢小劍;水電站有壓引水系統(tǒng)水力過渡過程計(jì)算研究[D];西安理工大學(xué);2007年

4 雷恒;水電站水力過渡過程數(shù)字仿真及分析[D];西華大學(xué);2006年

5 黃賢榮;水電站過渡過程計(jì)算中的若干問題研究[D];河海大學(xué);2006年

6 王丹;導(dǎo)葉啟閉規(guī)律及水輪機(jī)特性曲線對(duì)水電站過渡過程的影響研究[D];武漢大學(xué);2004年

，

本文編號(hào)：1843460