本文選題：低比轉(zhuǎn)速離心泵　切入點(diǎn)：切割　出處：《蘭州理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：通常定義30n_s80的離心泵為低比轉(zhuǎn)速離心泵，它因具有流量小、揚(yáng)程高的特點(diǎn)被廣泛應(yīng)用在石油、化工、礦山等領(lǐng)域。低比轉(zhuǎn)速離心泵內(nèi)部流動(dòng)十分復(fù)雜，它是帶有旋渦運(yùn)動(dòng)的三維不可壓湍流流動(dòng)，采用一般的實(shí)驗(yàn)方法很難對其內(nèi)部流動(dòng)進(jìn)行分析研究。目前，利用CFD對離心泵內(nèi)部流場進(jìn)行數(shù)值模擬是一種有效的研究方法。 為了達(dá)到對離心泵性能的需求，擴(kuò)大離心泵的使用范圍，通常對離心泵葉輪外徑采取切割的方式。常規(guī)的切割方法是選取性能高于所需性能的離心泵，對其葉輪外徑按照現(xiàn)行的切割公式進(jìn)行計(jì)算、修正，然后實(shí)施切割。離心泵葉輪外徑經(jīng)過切割之后葉輪幾何參數(shù)發(fā)生了變化，使得其內(nèi)部流動(dòng)與原型泵相比存在一定的差異。本文對MH-47-100型低比轉(zhuǎn)速離心泵在D'_2/D_20.9和0.8D'_2/D_20.9 情況下共進(jìn)行了五次切割，得到了切割之后離心泵的性能曲線。對五次切割后的 各性能曲線進(jìn)行了分析對比，討論了低比轉(zhuǎn)速離心泵葉輪外徑切割后的離心泵性能的變化。本文對MH-47-100型低比轉(zhuǎn)速離心泵開展研究主要為：1：對離心泵葉輪外徑進(jìn)行了5次切割，利用CFD對原型泵及切割后的各個(gè) 模型進(jìn)行了定常數(shù)值模擬計(jì)算，分析了葉輪外徑變化對離心泵內(nèi)部流動(dòng)帶來的影 響。2：計(jì)算了切割前和切割后各模型的面積比，根據(jù)現(xiàn)有文獻(xiàn)對面積比高效區(qū)的統(tǒng)計(jì)，得出了切割之后的各模型均落入高效區(qū)的特點(diǎn)。 3.在定常計(jì)算基礎(chǔ)上對原型泵及經(jīng)8mm和40mm切割后的兩模型共計(jì)三模型進(jìn)行了非定常數(shù)值模擬計(jì)算，分析不同葉輪外徑下泵內(nèi)部流動(dòng)的變化。 4.在葉輪出口及隔舌設(shè)置共設(shè)置9個(gè)監(jiān)測點(diǎn)，分析了不同外徑下的葉輪出口面和蝸殼出口壓力脈動(dòng)。 通過研究得出的主要結(jié)論有： 1：低比轉(zhuǎn)速離心泵葉輪外徑經(jīng)少量切割后，切割后的泵與原型泵內(nèi)部流動(dòng)較為相似；葉輪外徑經(jīng)大量切割后，兩者流動(dòng)不再相似。 2：在少量切割（低于10%切割量）下，離心泵外特性曲線較為相似，經(jīng)大量切割后，泵的外特性曲線不再相似。 3：通過各模型均落入面積比高效區(qū)的現(xiàn)象，說明了面積比高效區(qū)的統(tǒng)計(jì)規(guī)律具有一定的參考價(jià)值。 4：葉輪外徑切割后對離心泵蝸殼內(nèi)部靜壓值的影響要大于對葉輪內(nèi)部的靜壓值。隨著切割的增大，，泵內(nèi)各點(diǎn)的靜壓值均下降。 5：通過非定常計(jì)算得到了三模型不同時(shí)刻的壓力脈動(dòng)，并通過對比分析得到，葉輪外徑減小，壓力脈動(dòng)強(qiáng)度變小。
[Abstract]:Usually, 30ns80 centrifugal pump is defined as low specific speed centrifugal pump. It is widely used in petroleum, chemical industry, mine and other fields because of its small flow rate and high lift. The internal flow of low specific speed centrifugal pump is very complicated. It is a three-dimensional incompressible turbulent flow with vortex motion. It is difficult to analyze and study the internal flow by using general experimental methods. At present, numerical simulation of flow field in centrifugal pump by CFD is an effective method. In order to meet the demand of centrifugal pump performance and expand the use range of centrifugal pump, the outside diameter of impeller of centrifugal pump is usually cut. The conventional cutting method is to select the centrifugal pump whose performance is better than the required performance. The outer diameter of the impeller is calculated and corrected according to the current cutting formula, and then it is cut. The geometric parameters of the impeller are changed after the impeller outer diameter of the centrifugal pump has been cut. In this paper, the MH-47-100 type low specific speed centrifugal pump is compared with the prototype pump. In this paper, we compare the two types of MH-47-100 low specific speed centrifugal pump with two parts: 20 / 20. 9 and 0. 8 D / D 20. 9 in D / D _ 2 / D _ 2 / D _ (20. 9). The performance curve of centrifugal pump after cutting was obtained. The performance curves are analyzed and compared, and the change of centrifugal pump performance after cutting impeller outer diameter of low specific speed centrifugal pump is discussed. In this paper, the research on MH-47-100 centrifugal pump with low specific speed is mainly carried out as follows: 1: cutting the outer diameter of centrifugal pump impeller five times. Using CFD for prototype pump and after cutting. The model is calculated by steady numerical simulation, and the influence of impeller outer diameter change on the flow inside centrifugal pump is analyzed. The area ratio of each model before and after cutting is calculated. According to the statistics of the area ratio high efficiency region in the existing literature, the characteristics of each model falling into the high efficiency region after cutting are obtained. 3. On the basis of steady calculation, the unsteady numerical simulation of the prototype pump and the total three models after 8 mm and 40 mm cutting are carried out, and the variation of the flow inside the pump under different impeller diameter is analyzed. 4. Nine monitoring points were set up at the outlet of impeller and tongue, and the pressure pulsation of the outlet surface and volute outlet of impeller under different external diameters were analyzed. The main findings of the study are:. 1: the inner flow of the impeller of the centrifugal pump with low specific speed is similar to that of the prototype pump after a small amount of cutting, but the flow of the impeller is no longer the same after a large number of external diameters of the impeller are cut. 2: in a small amount of cutting (less than 10% cutting volume), the external characteristic curve of centrifugal pump is similar, after a lot of cutting, the external characteristic curve of pump is no longer similar. 3. Through the phenomenon that all the models fall into the area ratio high efficiency region, it is proved that the statistical law of the area ratio efficiency region has certain reference value. 4: the influence of the outer diameter of impeller on the internal static pressure of the volute of centrifugal pump is greater than that on the impeller. With the increase of cutting, the static pressure of each point in the pump decreases. 5: through unsteady calculation, the pressure pulsation of three models at different times are obtained, and by comparison and analysis, it is found that the impeller outer diameter decreases and the pressure pulsation intensity becomes smaller.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

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