【摘要】：低比轉(zhuǎn)速離心泵具有流量小、揚(yáng)程高的特點(diǎn),在石油和化工等領(lǐng)域有著廣泛的應(yīng)用。汽蝕性能差一直是困擾低比轉(zhuǎn)速離心泵研制和發(fā)展的關(guān)鍵難題之一。當(dāng)離心泵發(fā)生汽蝕時(shí),將產(chǎn)生振動(dòng)和噪聲,汽蝕特別嚴(yán)重時(shí)離心泵機(jī)組將不能正常工作,從而嚴(yán)重降低了泵的使用效率和工作的穩(wěn)定性,在葉輪前安裝誘導(dǎo)輪是提高離心泵抗汽蝕性能的主要方法。因此分析前置誘導(dǎo)輪對(duì)低比轉(zhuǎn)速離心泵汽蝕特性和內(nèi)部流場(chǎng)的影響具有重要的意義。本文采用數(shù)值模擬和實(shí)驗(yàn)的方法對(duì)有和無前置誘導(dǎo)輪的低比轉(zhuǎn)速離心泵的汽蝕特性和內(nèi)部流動(dòng)進(jìn)行分析,具體工作如下:(1)采用UG8.0三維實(shí)體建模軟件,對(duì)離心泵的過流部件進(jìn)行實(shí)體建模,主要包括等螺距兩葉片誘導(dǎo)輪、后彎式葉輪和環(huán)形蝸殼。利用ICEM網(wǎng)格劃分軟件對(duì)各個(gè)過流部件進(jìn)行網(wǎng)格劃分。然后導(dǎo)入CFD軟件PumpLinx進(jìn)行了非汽蝕和汽蝕工況下的數(shù)值模擬計(jì)算。(2)在非汽蝕工況下,基于標(biāo)準(zhǔn)k-ε湍流模型對(duì)無和有前置誘導(dǎo)輪的低比轉(zhuǎn)速離心泵內(nèi)部流場(chǎng)進(jìn)行了數(shù)值計(jì)算,并在不同流量工況點(diǎn)下,對(duì)比分析了兩臺(tái)泵內(nèi)葉輪中截面的壓力分布、速度分布以及蝸殼上的壓力脈動(dòng)。(3)在汽蝕工況下,基于全空化模型對(duì)無和有前置誘導(dǎo)輪的低比轉(zhuǎn)速離心泵內(nèi)部流場(chǎng)進(jìn)行了數(shù)值計(jì)算,對(duì)比分析了設(shè)計(jì)工況點(diǎn)時(shí)不同汽蝕余量下兩臺(tái)泵葉輪中截面的氣相體積分?jǐn)?shù)分布,及泵進(jìn)口壁面、葉輪內(nèi)部流道和蝸殼上的壓力脈動(dòng);并獲得了誘導(dǎo)輪內(nèi)部及葉輪葉片上的氣相體積分?jǐn)?shù)分布。(4)對(duì)前置誘導(dǎo)輪的低比轉(zhuǎn)速離心泵進(jìn)行了外特性實(shí)驗(yàn)和汽蝕性能實(shí)驗(yàn),獲得了前置誘導(dǎo)輪離心泵的外特性曲線和設(shè)計(jì)工況點(diǎn)的汽蝕性能曲線;并與數(shù)值計(jì)算結(jié)果進(jìn)行了對(duì)比分析,驗(yàn)證了數(shù)值模擬計(jì)算的可靠性。
[Abstract]:Low specific speed centrifugal pump is widely used in petroleum and chemical industry because of its low flow rate and high lift. Poor cavitation performance has always been one of the key problems in the research and development of low specific speed centrifugal pumps. When cavitation occurs, vibration and noise will occur, and the centrifugal pump unit will not work normally when cavitation is especially serious, thus seriously reducing the efficiency and stability of the pump. Installing the induction wheel in front of the impeller is the main method to improve the cavitation resistance of the centrifugal pump. Therefore, it is of great significance to analyze the cavitation characteristics and internal flow field of low specific speed centrifugal pump. In this paper, numerical simulation and experimental methods are used to analyze the cavitation characteristics and internal flow of low specific speed centrifugal pumps with and without front inducers. the specific work is as follows: (1) using UG8.0 three-dimensional solid modeling software, the overflowing parts of centrifugal pumps are modeled, including equal pitch two-blade induction wheel, rear bending impeller and annular volute. The ICEM meshing software is used to mesh each overflowing component. Then the CFD software PumpLinx is introduced into the numerical simulation of non-cavitation and cavitation conditions. (2) under the non-cavitation condition, the internal flow field of low specific speed centrifugal pump without and with front induction wheel is calculated based on the standard k-蔚 turbulence model, and the pressure distribution of the inner section of the impeller in the two pumps is compared and analyzed under different flow conditions. Velocity distribution and pressure fluctuation on volute. (3) under cavitation condition, the internal flow field of low specific speed centrifugal pump with no and no front inducer is calculated based on cavitation model, and the gas volume fraction distribution of the section of the impeller under different cavitation allowance is compared and analyzed, and the pressure fluctuation on the inlet wall of the pump, the inner passage of the impeller and the volute is compared and analyzed. The gas phase volume fraction distribution inside the induction wheel and on the impeller blade is obtained. (4) the external characteristics and cavitation performance experiments of the low specific speed centrifugal pump with the front induction wheel are carried out, and the external characteristic curve and the cavitation performance curve of the design working condition point of the front induction wheel centrifugal pump are obtained, and the results are compared with the numerical results to verify the reliability of the numerical simulation calculation.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH311

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李仁年;畢禎;黎義斌;肖麗倩;;誘導(dǎo)輪偏轉(zhuǎn)角對(duì)離心泵葉輪空化性能的影響[J];排灌機(jī)械工程學(xué)報(bào);2016年06期

2 姚志峰;陸力;高忠信;鄧杰;王福軍;;不同葉輪形式離心泵壓力脈動(dòng)和空化特性試驗(yàn)研究[J];水利學(xué)報(bào);2015年12期

3 張?jiān)评?袁壽其;張金鳳;馮耀寧;冒杰云;;分流葉片對(duì)離心泵空化性能影響的數(shù)值分析[J];排灌機(jī)械工程學(xué)報(bào);2015年10期

4 張德勝;潘大志;施衛(wèi)東;張光建;;軸流泵空化流及其誘導(dǎo)壓力脈動(dòng)的數(shù)值模擬[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年01期

5 王松林;譚磊;王玉川;;離心泵瞬態(tài)空化流動(dòng)及壓力脈動(dòng)特性[J];振動(dòng)與沖擊;2013年22期

6 王小波;王國(guó)玉;時(shí)素果;吳欽;;誘導(dǎo)輪內(nèi)部液氫空化流動(dòng)特性[J];排灌機(jī)械工程學(xué)報(bào);2013年07期

7 常書平;王永生;;基于CFD的混流泵空化特性研究[J];排灌機(jī)械工程學(xué)報(bào);2012年02期

8 李曉俊;袁壽其;劉威;潘中永;;帶誘導(dǎo)輪的離心泵空化條件下的效率下降規(guī)律[J];排灌機(jī)械工程學(xué)報(bào);2011年03期

9 王勇;劉厚林;袁壽其;談明高;王凱;;離心泵內(nèi)部空化特性的CFD模擬[J];排灌機(jī)械工程學(xué)報(bào);2011年02期

10 莊保堂;羅先武;王鑫;余偉平;許洪元;;立式多級(jí)筒袋泵誘導(dǎo)輪及首級(jí)葉輪內(nèi)的空化流動(dòng)模擬[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年02期

相關(guān)博士學(xué)位論文 前1條

1 崔寶玲;高速誘導(dǎo)輪離心泵的理論分析與數(shù)值模擬[D];浙江大學(xué);2006年

，

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