本文選題：離心雜質(zhì)泵 + 固液兩相流�。� 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：離心式雜質(zhì)泵在水利輸送方面應用非常廣泛,但是目前該類泵仍然存在一些關(guān)鍵技術(shù)難題,第一個是由于固相顆粒的存在而導致泵的效率下降,第二個是由于固相顆粒對泵過流零部件的沖蝕磨損導致泵的可靠性變差,這兩項技術(shù)難題嚴重阻礙了離心雜質(zhì)泵研究與應用。本文以離心雜質(zhì)泵為研究對象,闡述離心式雜質(zhì)泵的研究背景,建立離心泵三維全流道模型,選用合適的湍流計算模型模擬離心泵內(nèi)部流場,分析固相顆粒在離心泵內(nèi)部的受力情況在運動軌跡,探討固相顆粒對過流零部件的沖蝕磨損機理,選用適合離心雜質(zhì)泵的Finnie沖蝕磨損模型對離心泵過流零部件做磨損預測。采用歐拉多相流模型對離心泵內(nèi)部固液兩相湍流場進行定常計算,比較不同固相顆粒直徑和固相體積分數(shù)對離心泵流動特性以及揚程效率的影響。發(fā)現(xiàn)隨著固相體積分數(shù)和固相顆粒直徑的增加,固相跟隨性變差,液相流動性變差,離心泵內(nèi)部壓力增加,揚程和效率下降,磨損也隨之增加。固相濃度分布呈現(xiàn)出下降趨勢,但是分布更趨于均勻。利用DPM模型在不同固相顆粒直徑和沖擊速度工況下對離心泵過流零部件磨損進行分析,計算平均磨損率發(fā)現(xiàn)磨損部位主要存在蝸殼流道、葉片背面后段與葉片頭部和后蓋板導流錐附近;另外還研究了固相顆粒直徑和固相沖擊速度變化對過流零部件磨損率分布的影響,得到隨著固相顆粒直徑和沖擊速度的變化,蝸殼的磨損范圍擴大,磨損率有所上升,葉片磨損分布由葉片背面尾部擴展到葉片背面的中部,后蓋板的磨損率明顯增加,效率下降明顯,揚程下降緩慢。
[Abstract]:Centrifugal impurity pump is widely used in water conservancy transportation, but at present there are still some key technical problems in this kind of pump. The first is that the efficiency of the pump is reduced because of the existence of solid particles. The second one is that the reliability of the pump becomes worse due to the erosion and wear of the solid particles to the flow parts of the pump. These two technical problems seriously hinder the research and application of centrifugal impurity pump. In this paper, the centrifugal impurity pump is taken as the research object, the research background of the centrifugal impurity pump is expounded, the three-dimensional full-channel model of the centrifugal pump is established, and the suitable turbulence calculation model is selected to simulate the flow field inside the centrifugal pump. This paper analyzes the movement track of solid particles acting on the centrifugal pump, discusses the erosion and wear mechanism of the solid particles on the overflowing parts, and selects the Finnie erosion wear model suitable for the centrifugal impurity pump to predict the wear of the over flow parts of the centrifugal pump. Eulerian multiphase flow model was used to calculate the turbulent field of solid and liquid in centrifugal pump. The effects of different solid particle diameter and solid volume fraction on the flow characteristics and lift efficiency of centrifugal pump were compared. It is found that with the increase of solid volume fraction and solid particle diameter, the solid following becomes worse, the liquid flow becomes worse, the internal pressure of centrifugal pump increases, the lift and efficiency decrease, and the wear increases. The distribution of solid concentration showed a decreasing trend, but the distribution tended to be more uniform. The wear of centrifugal pump overflowing parts was analyzed by using DPM model under different solid particle diameter and impact velocity conditions. The main worsted runner was found to exist in the wear area by calculating the average wear rate. In addition, the influence of the change of solid particle diameter and solid impact velocity on the wear rate distribution of overflowing parts is also studied, and the change of solid particle diameter and impingement velocity is obtained with the change of solid particle diameter and impact velocity. The wear range of the volute is enlarged and the wear rate is increased. The wear distribution of the blade extends from the rear tail of the blade to the middle of the back of the blade. The wear rate of the rear cover plate increases obviously the efficiency decreases obviously and the head drops slowly.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH311

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