發(fā)布時間：2019-01-08 13:46

【摘要】：自吸泵作為一種特殊的離心泵,主要應(yīng)用于工業(yè)特殊領(lǐng)域。自吸泵在首次啟動之前需要向泵內(nèi)灌液,以后再次啟動時無需灌泵。本文在總結(jié)國內(nèi)外學(xué)者對于自吸泵研究的基礎(chǔ)上,進一步對自吸泵的自吸過程做了研究探討。首先,對立式導(dǎo)葉自吸泵結(jié)構(gòu)、原理做了介紹,并對關(guān)鍵過流部件葉輪、導(dǎo)葉進行了設(shè)計;然后利用CFX軟件對自吸泵進行了定常液相模擬,分析揭示了葉輪流道內(nèi)絕對速度、相對速度、壓力分布情況,然后對預(yù)測獲得的泵模擬性能曲線與試驗曲線進行對比,發(fā)現(xiàn)二者吻合度較好,從而證明了所用模型較好。然后,利用非穩(wěn)態(tài)數(shù)值模擬方法模擬自吸泵自吸過程,初始條件為進水管及出水管含有部分空氣,分析了泵在自吸過程中泵內(nèi)氣液兩相分布情況、葉輪與導(dǎo)葉中流動演變情況;通過CFX提供的函數(shù)獲得葉輪進口、泵出口氣相流量隨時間變化規(guī)律,并由泵出口氣相流量估算出泵的自吸時間;由于氣液分離室是氣液混合與分離的主要場所;因此,分析了分離室內(nèi)有擋板對泵自吸過程影響,并將其與無擋板時自吸情況進行對比。最后,對自吸泵進行了正交模擬設(shè)計。根據(jù)分析選取四個對自吸性能有影響的因素進行模擬設(shè)計,通過對數(shù)據(jù)處理和分析,得出各因素對試驗指標影響的主次順序,并獲得最佳方案。通過指標因素圖發(fā)現(xiàn)葉輪與導(dǎo)葉間隙是自吸時間和自吸高度的主要影響因素;因此進一步探討葉輪與導(dǎo)葉間隙對自吸時間影響,分析發(fā)現(xiàn),間隙存在一個最佳值。
[Abstract]:As a special centrifugal pump, self-priming pump is mainly used in industrial special field. The self-priming pump needs to be pumped before the first start, and not to be pumped when it starts again. On the basis of summarizing the research of self-priming pump at home and abroad, the self-priming process of self-priming pump is further discussed in this paper. Firstly, the structure and principle of self-priming pump with opposite guide vane are introduced, and the impeller and guide vane are designed. Then, the steady liquid phase simulation of the self-priming pump is carried out by using CFX software, and the absolute velocity, relative velocity and pressure distribution in the impeller passage are analyzed and revealed. Then the predicted simulation performance curve is compared with the experimental curve. It is found that the two models are in good agreement with each other, which proves that the model used is better. Then, the self-priming process of self-priming pump is simulated by unsteady state numerical simulation method. The initial condition is that the inlet pipe and outlet pipe contain part of air. The gas-liquid two-phase distribution in the pump and the flow evolution in impeller and guide vane are analyzed in the process of self-priming. According to the function provided by CFX, the variation law of gas phase flow at the pump outlet with time is obtained, and the self-priming time is estimated from the pump exit gas phase flow, because the gas-liquid separation chamber is the main place for gas-liquid mixing and separation. Therefore, the influence of the baffle on the self-priming process of the pump is analyzed and compared with the self-priming process without the baffle. Finally, the orthogonal simulation design of the self-priming pump is carried out. According to the analysis, four factors which have influence on the self-priming performance are selected to simulate the design. Through the data processing and analysis, the primary and secondary order of the influence of each factor on the test index is obtained, and the best scheme is obtained. It is found that the clearance between impeller and guide vane is the main influencing factor of self-priming time and height, so the influence of impeller and guide vane clearance on self-priming time is further discussed, and it is found that there is an optimum value of clearance.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH317

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