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  本文關(guān)鍵詞：離心泵葉輪特殊切割方法的研究與探討　出處：《浙江工業(yè)大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 離心泵 葉輪 切割方法 性能曲線 數(shù)值模擬 試驗(yàn)研究

【摘要】：低比轉(zhuǎn)速離心泵的H-Q性能曲線比較平坦,容易產(chǎn)生駝峰。駝峰特性曲線的關(guān)死點(diǎn)揚(yáng)程低于泵的最大揚(yáng)程值,在運(yùn)轉(zhuǎn)中不穩(wěn)定,特別是在小流量工況,泵和管路系統(tǒng)內(nèi)可能會(huì)產(chǎn)生振動(dòng)和噪聲,具有較大的危害性。因此尋找簡(jiǎn)單易行的消除泵特性曲線駝峰的方法具有重要的意義。 斜切葉輪外徑、葉片出口邊三角形切割等一些特殊的葉輪切割方法可以消除離心泵特性曲線駝峰,但這些切割方法的應(yīng)用大多依賴于經(jīng)驗(yàn),切割尺寸的選擇缺少理論依據(jù)。為此,本文在這兩種特殊切割方法的基礎(chǔ)上,提出一種新型的半圓形切割方法,以這三種葉輪特殊切割方法為研究對(duì)象,采用CFD數(shù)值模擬方法,對(duì)葉輪及蝸殼內(nèi)部流動(dòng)狀態(tài)進(jìn)行計(jì)算和分析,同時(shí)對(duì)不同的葉輪切割方法及其切割尺寸與離心泵性能曲線駝峰之間的關(guān)系進(jìn)行了理論分析,并制造樣機(jī)對(duì)模擬結(jié)果進(jìn)行試驗(yàn)驗(yàn)證。最終得到了幾種優(yōu)秀的切割模型,為離心泵葉輪特殊切割方法的使用提供了科學(xué)依據(jù)。 本文的主要研究工作包括： (1)查閱了大量國(guó)內(nèi)外研究離心泵葉輪切割的文獻(xiàn),綜述了葉輪切割定律以及葉輪切割方法的研究現(xiàn)狀,為提出新型葉輪切割方法提供理論依據(jù)和前期準(zhǔn)備工作。 (2)系統(tǒng)地介紹了利用CFD數(shù)值模擬計(jì)算離心泵流場(chǎng)分布的研究方法,包括離心泵的Pro/E三維建模方法、Gambit網(wǎng)格生成方法、Fluent求解器參數(shù)定義和離散化方法的選擇。并利用該方法對(duì)IS80-50-250型單級(jí)單吸清水離心泵內(nèi)流場(chǎng)進(jìn)行CFD數(shù)值模擬。 (3)對(duì)三角形切割、半圓形切割和斜切葉輪外徑方法進(jìn)行詳細(xì)的描述,制定多組研究方案對(duì)三種葉輪特殊切割方法進(jìn)行研究。介紹了基于CFD數(shù)值模擬的離心泵性能曲線預(yù)測(cè)方法,并利用該方法預(yù)測(cè)模型泵及各切割方案的離心泵性能曲線。比較各種切割方案對(duì)性能曲線的改善情況,確定三角形切割、半圓形切割和斜切葉輪外徑方法的最佳切割尺寸。 (4)根據(jù)數(shù)值模擬結(jié)果,利用Fluent后處理工具,分析離心泵的內(nèi)部流動(dòng)規(guī)律。結(jié)果表明,在小流量工況時(shí),離心泵葉輪出口以及蝸殼內(nèi)部存在較大的壓力梯度,速度分布不均勻,由此產(chǎn)生的混合沖擊損失導(dǎo)致關(guān)死點(diǎn)揚(yáng)程降低,并使泵特性曲線產(chǎn)生駝峰。對(duì)葉輪葉片出口邊進(jìn)行特殊形狀的切割可以改善小流量工況泵內(nèi)部湍流流動(dòng)狀態(tài),從而消除泵特性曲線駝峰。 (5)對(duì)模型泵及三角形最佳切割方案進(jìn)行離心泵性能試驗(yàn),驗(yàn)證數(shù)值模擬結(jié)果的準(zhǔn)確性。試驗(yàn)表明揚(yáng)程預(yù)測(cè)誤差為-3.02%～1.69%,效率預(yù)測(cè)誤差為1.46%～4.72%,最大誤低于5%,模擬結(jié)果和試驗(yàn)結(jié)果符合良好。
[Abstract]:The H-Q performance curve of the centrifugal pump with low specific speed is flat and easy to produce hump. The dead point head of the hump characteristic curve is lower than the maximum lift value of the pump and is unstable in operation especially in the small flow condition. The vibration and noise may occur in the pump and pipeline system, which is harmful. Therefore, it is of great significance to find a simple and feasible method to eliminate the hump of the pump characteristic curve. Some special impeller cutting methods, such as external diameter of oblique impeller and triangular cutting of blade outlet edge, can eliminate the hump of characteristic curve of centrifugal pump, but the application of these cutting methods mostly depends on experience. The selection of cutting size is lack of theoretical basis. Therefore, based on the two special cutting methods, this paper proposes a new semi-circular cutting method, taking these three special impeller cutting methods as the research object. The flow state of impeller and volute is calculated and analyzed by CFD numerical simulation method. At the same time, the relationship between different impeller cutting methods and the relationship between the cutting size and the hump of centrifugal pump performance curve is analyzed theoretically. Finally, several excellent cutting models are obtained, which provide a scientific basis for the use of special cutting methods for centrifugal pump impeller. The main research work of this paper includes: 1) A large number of literatures on centrifugal pump impeller cutting are reviewed, and the current research status of impeller cutting law and impeller cutting method is summarized. It provides theoretical basis and preparatory work for the new impeller cutting method. This paper introduces the research method of calculating flow field distribution of centrifugal pump by CFD numerical simulation, including Pro/E 3D modeling method of centrifugal pump and Gambit mesh generation method. The parameter definition of Fluent solver and the choice of discretization method are used to simulate the flow field in IS80-50-250 single-stage single-suction centrifugal pump with CFD. 3) the methods of triangle cutting, semicircle cutting and oblique cutting impeller outer diameter are described in detail. Three kinds of special impeller cutting methods are studied in this paper. The prediction method of centrifugal pump performance curve based on CFD numerical simulation is introduced. This method is used to predict the performance curve of the model pump and the centrifugal pump of each cutting scheme. The triangle cutting is determined by comparing the improvement of the performance curve of various cutting schemes. Optimum cutting size of semicircle and oblique cutting impeller outer diameter method. 4) according to the numerical simulation results, the internal flow law of centrifugal pump is analyzed by using Fluent post-processing tool. The results show that the flow rate is small in the case of small flow rate. There is a large pressure gradient and uneven velocity distribution in the outlet of centrifugal pump impeller as well as inside the volute. The resulting mixed impact loss results in the decrease of closed dead point head. The special shape cutting of the impeller blade outlet edge can improve the turbulent flow state of the pump under small flow conditions, thus eliminating the hump of the pump characteristic curve. The model pump and triangle optimum cutting scheme are tested to verify the accuracy of numerical simulation results. The results show that the error of lift prediction is -3.02% and 1.69%. The efficiency prediction error is 1.46 and 4.72, and the maximum error is less than 5. The simulation results are in good agreement with the test results.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH311

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