本文關(guān)鍵詞：旋流式豎井渦室水力特性研究　出處：《西北農(nóng)林科技大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 水力特性 旋流式豎井 渦室 體型 水面線

【摘要】：旋流式豎井作為一種新型的內(nèi)消能工,由于其良好的水力特性與高消能率,作為泄洪洞體現(xiàn)了愈來愈高的工程價值,并且其研究越來越受到人們的追捧。目前,對旋流式豎井渦室體型的選擇,主要是依靠流量來進行選擇:圓弧渦室泄流能力較小,適用于流量小于500 m3/s;橢圓曲線渦室泄流能力要大一些,適用于流量小于3000 m3/s。但是,旋流式豎井的流量是與豎井直徑緊密聯(lián)系的,共同影響著旋流式豎井的泄流能力,僅以流量來界定是不準確的;另外,旋流式豎井渦室水面線的計算,暫沒有明確的計算方法,而水面線作為水力學研究的重點之一,在旋流式豎井渦室邊墻高度選擇上起著非常重要的作用。本文采用模型試驗的方法,來研究旋流式豎井渦室的水力特性,對旋流式豎井渦室的流態(tài)、水面線、壓強、流速等水力要素進行測量分析,并且分別以試驗研究以及論證流量管徑數(shù)的方法來研究旋流式豎井渦室體型的選擇標準,另外提出采用劉韓生沖擊波簡化式計算渦室水面線問題。具體表現(xiàn)在以下幾個方面:(1)栗西溝尾礦庫排洪管是小流量泄洪設(shè)施,現(xiàn)有方法不能選定渦室體型,通過水工模型試驗比較了圓弧渦室和橢圓曲線渦室對栗西溝的適用性,表明:a.圓弧形渦室在各種流量下,泄流流態(tài)都不如橢圓曲線渦室,后者各流量狀態(tài)下都能夠形成理想的貼壁螺旋流。b.橢圓曲線渦室體型流態(tài)良好,在加大渦室來流段底坡坡度,可以使渦室過流面積增加,減少壅水發(fā)生的可能性;導流坎可以減小入流與旋轉(zhuǎn)回流之間的夾角,減輕壅水的作用;能夠形成良好的貼壁旋流流態(tài),并且不會產(chǎn)生空化空蝕問題,是其適合的渦室體型,并且能為以后小流量的旋流式豎井工程渦室體型選擇提供借鑒。(2)橢圓曲線渦室流態(tài)相對于圓弧渦室流態(tài)更加穩(wěn)定,旋轉(zhuǎn)效果更好;渦室及其下漸變段內(nèi)皆為正壓情況,因此不會出現(xiàn)負壓,對工程產(chǎn)生影響;渦室及其下漸變段壓強的分布具有明顯的分布特點;渦室水流流速較低,在最大流量22 m3/s下,渦室邊壁流速最大僅為8.54m/s,如此較低的流速保證渦室不會發(fā)生空蝕破壞。(3)栗西溝工程實例計算結(jié)果表明,在旋流式豎井渦室水面線計算方面,劉韓生緩沖擊波簡化式相對Ippen沖擊波理論計算精度更高,能夠更加準確的計算渦室水面線。另外,前者較后者,計算過程更加簡單快捷,不需要繁瑣迭代試算過程,更適合實際工程的需要。因此,劉韓生緩沖擊波簡化式能夠比較精確的計算渦室水面線問題,能夠為以后的實際工程提供借鑒。(4)流量管徑數(shù)η能夠非常清晰的描述旋流式豎井的泄流能力,當流量管徑數(shù)η越大,說明旋流式豎井的泄流能力越強;反之亦然。實際工程實例和栗西溝水工模型試驗表明橢圓曲線渦室為大流量管徑數(shù)旋流式豎井的合適體型,不僅能夠保持很好的旋流流態(tài),還可以保持良好的工程經(jīng)濟性。并且,橢圓渦室體型也適合小流量管徑數(shù)旋流式豎井的要求。
[Abstract]:Cyclone shaft as a new type of energy dissipation, because of its good hydraulic properties and high energy dissipation, as Hongdong relief reflects the increasingly high engineering value, and its research has become more and more popular. At present, the cyclone shaft vortex chamber type selection, mainly rely on the flow of selection: circular vortex chamber discharge capacity is small, suitable for the flow rate is less than 500 m3/s; elliptic curve of vortex chamber discharge capacity to be big, suitable for the flow of less than 3000 m3/s. but the cyclone shaft flow is closely related with the diameter of the shaft, to affect the discharge capacity of cyclone shafts, only to flow to define is not accurate; in addition, the calculation of water level line of cyclone shaft vortex chamber, there is no clear method of calculation, and the water line as one of the key to the study of hydraulics, the cyclone shaft vortex chamber side wall height selection plays a very heavy To function. This paper uses the method of model test, the hydraulic characteristics of cyclone shaft vortex chamber, the cyclone shaft flow, vortex chamber water line, pressure, velocity measurement and analysis of hydraulic elements, selection criteria and were in the experimental research and demonstration method to study the flow diameter number of vortex cyclone shaft room size, also put forward by the shock wave of Liu Hansheng type simplified calculation of water surface line vortex chamber. The specific performance in the following aspects: (1) the tailings of Lixigou drainage pipe is small discharge facilities, the existing methods can not be selected vortex chamber size, the applicability of circular vortex chamber and volute chamber of Lixi elliptic curve ditch the comparison through the hydraulic model test shows that the A. arc shaped vortex chamber in various flow conditions, the discharge flow pattern as the elliptic curve vortex chamber can form an adherent.B. elliptic vortex flow state the latter song Line type vortex chamber flow, vortex chamber flow to increase in the bottom slope, can make the vortex chamber flow area increases, reduce the possibility of occurrence of backwater; diversion bank can be reduced into the angle between the rotation flow and return, reduce the backwater effect; can form good adherent swirl flow, and not produce cavitation, which is suitable for vortex chamber size, and can provide reference for the future of small flow vortex chamber type cyclone shaft project. (2) the elliptic curve of vortex chamber flow relative to the circular vortex chamber flow is more stable, the rotation effect is better; and the transition in the vortex chamber is positive pressure therefore, does not appear negative impact on engineering; distribution of vortex chamber and transition pressure distribution has the obvious characteristics of the vortex chamber; flow velocity is low, the maximum flow rate of 22 m3/s, the maximum velocity of vortex chamber wall is only 8.54m/s, so low To ensure the flow of vortex chamber will not produce cavitation damage. (3) Lixigou computational results show that the calculation of water surface profile in cyclone shaft vortex chamber, Liu Hansheng shock wave type Ippen shock wave theory simplified relative higher calculation accuracy, can accurately calculate the vortex chamber water surface line. In addition, the former is the calculation process is more simple and quick, do not need tedious iterative process, more suitable for the actual needs of the project. Therefore, the Liu Hansheng shock wave can simplify the calculation of vortex chamber water line accurately, can provide a reference for future projects. (4) the number of flow diameter ETA discharge capacity can describe the cyclone the shaft is very clear, when the number of the larger diameter flow is, that discharge capacity of more strong cyclone shaft; and vice versa. The actual project and water Li Xi model test show that elliptic curve of vortex chamber for large diameter flow The suitable shape of a number of swirling shaft can not only maintain a good swirling flow pattern, but also maintain good engineering economy. Moreover, the elliptical vortex chamber shape is also suitable for small flow diameter pipe swirling shaft.

【學位授予單位】：西北農(nóng)林科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV135.2

【相似文獻】

相關(guān)期刊論文 前4條

1 史力生,董興林;混合型豎井泄水道研究[J];水利學報;1992年05期

2 楊海波;刁明軍;李斌華;;高水頭大流量豎井旋流水氣二相流三維數(shù)值模擬[J];西南民族大學學報(自然科學版);2007年03期

3 譚志偉;;豎井式跌水水力計算的探討[J];中國農(nóng)村水利水電;2008年02期

4 張建民;任成瑤;許唯臨;李忠;胡曉禹;;淹沒出流型漩流豎井泄洪洞新型連接型式及水力特性研究[J];水力發(fā)電學報;2012年05期

相關(guān)會議論文 前2條

1 梁羽飛;;豎井式退水口在渦河治理工程中的應用[A];機械疏浚專業(yè)委員會第十九次疏浚與吹填技術(shù)經(jīng)驗交流會論文與技術(shù)經(jīng)驗總結(jié)文集[C];2006年

2 嚴蕾;鞏強;張斌;李桂蘭;;豎井式泵站機組選型及結(jié)構(gòu)設(shè)計的探討[A];中國水利學會2003學術(shù)年會論文集[C];2003年

相關(guān)碩士學位論文 前5條

1 何軍齡;某工程豎井旋流泄洪洞水力特性研究[D];西北農(nóng)林科技大學;2017年

2 趙建永;旋流式豎井渦室水力特性研究[D];西北農(nóng)林科技大學;2017年

3 趙燦華;豎井螺旋流水力學特性研究[D];中國水利水電科學研究院;2001年

4 吳鵬;豎井水平旋流新型消能工的數(shù)值模擬研究[D];合肥工業(yè)大學;2010年

5 李天景;浙江毛漾蕩豎井貫流泵裝置整體數(shù)值模擬與試驗研究[D];揚州大學;2013年

，

本文編號：1357868