發(fā)布時(shí)間：2018-04-04 02:58

  本文選題：高水頭貫流　切入點(diǎn)：斜向式導(dǎo)水機(jī)構(gòu)　出處：《西華大學(xué)》2014年碩士論文

【摘要】：縱觀我國水利水電事業(yè)的開發(fā)情況，運(yùn)用于中低水頭段的貫流式機(jī)組現(xiàn)在仍有相當(dāng)大的發(fā)展空間。本課題主要研究應(yīng)用于貫流式水輪機(jī)以及高水頭貫流式水輪機(jī)的斜向式導(dǎo)水機(jī)構(gòu)二重葉柵內(nèi)部流動(dòng)規(guī)律，從而為斜向式導(dǎo)水機(jī)構(gòu)導(dǎo)葉設(shè)計(jì)理論及方法提供理論基礎(chǔ)。 由于這種貫流式水輪機(jī)不再設(shè)置蝸殼部件，隨著實(shí)際的運(yùn)行水頭的提高，轉(zhuǎn)輪進(jìn)口所需的環(huán)量增大，全部環(huán)量只能通過斜向式導(dǎo)水機(jī)構(gòu)來形成，必導(dǎo)致活動(dòng)導(dǎo)葉負(fù)荷過重、扭曲嚴(yán)重，產(chǎn)生嚴(yán)重的脫流以及空蝕。同時(shí)，由于活動(dòng)導(dǎo)葉錐形布置，嚴(yán)重扭曲的翼型必然導(dǎo)致其難以封水以及加工制造。因此，解決活動(dòng)導(dǎo)葉和固定導(dǎo)葉各自應(yīng)當(dāng)形成多少環(huán)量的問題，對(duì)機(jī)組的設(shè)計(jì)、制造以及穩(wěn)定運(yùn)行至關(guān)重要。 本課題的研究基于流體力學(xué)、水力機(jī)械流動(dòng)理論，探究高水頭貫流式水輪機(jī)流道內(nèi)的水流運(yùn)動(dòng)規(guī)律，建立流動(dòng)的理論模型，，得出斜向式導(dǎo)水機(jī)構(gòu)二重葉柵流動(dòng)軸面流速遵循Vm R=const的理論模型，并由自由渦理論，水流在二重葉柵中同樣遵循Vu r=const理論，由此得出Vm R=const及Vu r=const的流動(dòng)理論，并采用標(biāo)準(zhǔn)的k—模型完成斜向式導(dǎo)水機(jī)構(gòu)二重葉柵內(nèi)流場的CFD分析。并研究了同一工況下二重葉柵的最佳位置關(guān)系和兩者之間環(huán)量分配情況，探尋二重葉柵環(huán)量分布關(guān)系對(duì)水輪機(jī)全流場性能的變化規(guī)律，以及對(duì)整個(gè)機(jī)組性能的影響，最終得到固定導(dǎo)葉、活動(dòng)導(dǎo)葉二重葉柵的最佳位置關(guān)系和環(huán)量分布規(guī)律，為斜向式導(dǎo)水機(jī)構(gòu)二重葉柵的水力設(shè)計(jì)提供理論依據(jù)。
[Abstract]:According to the development of water conservancy and hydropower industry in China, there is still considerable room for development of tubular units in middle and low head sections.This paper mainly studies the internal flow law of double cascade of inclined guide mechanism used in tubular turbine and high head tubular turbine, which provides a theoretical basis for the design theory and method of guide vane of inclined water guide mechanism.Since this type of tubular turbine is no longer equipped with volute parts, with the increase of the actual running water head, the amount of ring required for the inlet of the runner increases, and the total ring quantity can only be formed by the oblique water guide mechanism, which will lead to the excessive load of the active guide vane.The distortion is severe, resulting in severe decurrent and cavitation erosion.At the same time, because of the conical arrangement of the movable guide vane, the seriously twisted airfoil will make it difficult to seal water and manufacture.Therefore, it is very important for the design, manufacture and steady operation of the unit to solve the problem of how many rings should be formed each of the active guide vane and the fixed guide vane.Based on hydrodynamics and hydraulic mechanical flow theory, the research of this topic is to explore the flow movement law in the passage of high head tubular turbine, and to establish the theoretical model of flow.It is concluded that the axial flow velocity of double cascade of oblique diversion mechanism follows the theoretical model of VM R=const, and from the theory of free vortex, the flow of water follows the theory of Vu r=const in the double cascade, and the flow theory of VM R=const and Vu r=const is obtained.The standard k- model is used to analyze the flow field in the double cascade of oblique water conduction mechanism by CFD.The optimal position relation of double cascade and the distribution of ring quantity between them under the same working condition are studied, and the variation law of the distribution of double cascade ring on the whole flow field performance of hydraulic turbine and the effect on the performance of the whole unit are explored.Finally, the optimal position relation and distribution law of the double cascade with fixed guide vane and movable guide vane are obtained, which provides the theoretical basis for the hydraulic design of the double cascade of the oblique guiding mechanism.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV734.1

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本文編號(hào)：1708067