發(fā)布時間：2018-05-28 09:10

  本文選題：深井泵 + 數(shù)值計算　； 參考：《江蘇大學》2017年碩士論文

【摘要】：作為一種提供高揚程液體的通用機械,深井泵已被廣泛應用于國民經(jīng)濟和社會生產(chǎn)的各個領域。由于泵體外徑受到井徑的限制,深井泵大多采用增加級數(shù)的方法來滿足總揚程的需求,這會導致其軸向長度較大,因而給深井泵的安裝與維修帶來不便。為了提高深井泵的單級揚程、縮短其軸向長度,提高其運行轉速已成為深井泵設計的一大趨勢。本文以UG 8.0、ANSYS CFX 14.5等軟件為工具,完成了100QJ20型高速深井泵的水力設計與數(shù)值計算,并通過性能試驗驗證了數(shù)值計算的準確性。主要研究內(nèi)容與取得的研究成果如下:(1)回顧了深井泵產(chǎn)品的發(fā)展歷史,對其水力設計的相關研究做了簡單的總結,并介紹了近年來泵內(nèi)部流動與泵轉速變化的研究現(xiàn)狀。(2)基于等比例縮放設計法完成了100QJ20型深井泵的水力設計,并對初始模型(150QJ36型深井泵)與設計模型分別進行了三維建模與各計算域的網(wǎng)格劃分,采用ANSYS CFX軟件分別完成了兩組模型的數(shù)值計算。兩組模型的外特性在0.4~1.6倍額定流量工況范圍內(nèi)基本滿足相似換算準則,其內(nèi)部流場的分布規(guī)律具有較強的相似性與微小的差異性。對150QJ36型深井泵進行了性能試驗,結果表明數(shù)值預測揚程與功率略低于試驗結果,預測的效率略高于試驗值,但整體上兩者隨流量的變化趨勢基本一致,證實本文的數(shù)值模擬具有較高的精度。(3)對100QJ20型深井泵分別在三種不同轉速方案下進行了多工況數(shù)值計算,分析了運行轉速對深井泵性能的影響。結果表明不同轉速下的深井泵揚程、功率預測值基本滿足相似換算準則,泵效率則隨著轉速的提高而有所提升。這是由于不同轉速下泵內(nèi)的圓盤摩擦損失不符合相似換算準則而造成的,隨著轉速的提高,圓盤摩擦損失在軸功率中所占的比重不斷下降。(4)在深井泵模型各計算子域中布置了多組監(jiān)測點,完成了對深井泵模型在3種不同轉速下的非定常數(shù)值計算,獲取了各監(jiān)測點的壓力脈動數(shù)據(jù)。通過對壓力脈動數(shù)據(jù)的無量綱處理與快速傅里葉變換,獲得了壓力脈動時域分布和頻域分布,對比發(fā)現(xiàn)泵內(nèi)壓力脈動存在較為復雜的級間耦合與拍振現(xiàn)象。不同轉速下泵內(nèi)壓力脈動的分布規(guī)律具有一定的相似性,但高轉速下泵內(nèi)壓力脈動的主頻頻率要高于低轉速下的,且轉速的變化會引起某些監(jiān)測點壓力脈動相位的改變。(5)確定了三種不同的轉速變化方式,并以此完成了不同轉速變化方式下深井泵模型的非定常數(shù)值計算。在三種方案中,直線加速過程與開口向下的二次加速過程中,揚程的波動要弱于開口向上的二次加速過程,且開口向下的二次加速過程能夠最先達到揚程要求;在泵加速過程中,葉輪流道內(nèi)的二次流會得到明顯的改善。
[Abstract]:As a kind of universal machinery to provide high head liquid, deep well pump has been widely used in various fields of national economy and social production. Because the outer diameter of pump body is limited by the well diameter, most deep well pumps adopt the method of increasing series to meet the demand of total head, which will lead to the large axial length of pump, which brings inconvenience to the installation and maintenance of deep well pump. In order to improve the single stage head of deep well pump, shorten its axial length and improve its running speed, it has become a major trend in the design of deep well pump. In this paper, the hydraulic design and numerical calculation of 100QJ20 type high speed deep well pump are completed with the software of UG 8.0 and ANSYS CFX 14.5, and the accuracy of numerical calculation is verified by performance test. The main research contents and results obtained are as follows: (1) reviewing the development history of deep well pump products, and briefly summarizing the relevant research on hydraulic design of deep well pumps. The research status of pump internal flow and pump speed change in recent years is introduced. The hydraulic design of 100QJ20 deep well pump is completed based on the equal scale scaling design method. The initial model and the design model are modeled and meshed in each computing domain respectively. The numerical calculation of the two groups of models is completed by using ANSYS CFX software. The external characteristics of the two groups of models basically meet the similar conversion criterion in the range of 0.4 ~ 1.6 times rated flow rate, and the distribution law of internal flow field has strong similarity and small difference. The performance test of 150QJ36 type deep well pump is carried out. The results show that the predicted head and power are slightly lower than the test results, and the predicted efficiency is slightly higher than the experimental value, but on the whole, the variation trend of the two kinds of pumps with the flow rate is basically the same. It is proved that the numerical simulation in this paper has a high accuracy. The numerical calculation of 100QJ20 deep well pump under three different rotational speed schemes has been carried out, and the effect of running speed on the performance of deep well pump has been analyzed. The results show that the power prediction value of the deep well pump at different rotational speeds basically meets the similar conversion criteria, while the pump efficiency is improved with the increase of the rotational speed. This is caused by the fact that the friction loss of the disk in the pump does not conform to the similar conversion criteria at different rotational speeds, and with the increase of the rotational speed, The proportion of disk friction loss in shaft power is decreasing continuously. (4) multiple monitoring points are arranged in each calculation subdomain of deep well pump model, and the unsteady numerical calculation of deep well pump model under three different rotational speeds is completed. The pressure fluctuation data of each monitoring point are obtained. The time-domain and frequency-domain distributions of pressure pulsation are obtained by dimensionless processing and fast Fourier transform of pressure pulsation data. It is found that there are more complicated phenomena of interstage coupling and beat vibration in pump pressure pulsation. The distribution of pressure pulsation in the pump at different rotational speeds is similar, but the main frequency of the pressure pulsation in the pump at high rotational speed is higher than that at low rotational speed. And the change of rotational speed will cause the change of the phase of pressure pulsation in some monitoring points.) three different rotational speed change modes are determined and the unsteady numerical calculation of the deep well pump model under different rotational speed variation modes is completed. In the three schemes, the fluctuation of the head is weaker than the second acceleration up the opening in the linear acceleration process and the secondary acceleration process down the opening, and the secondary acceleration process down the opening can first meet the requirements of the lift. In the process of pump acceleration, the secondary flow in the impeller passage will be improved obviously.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH38

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