【摘要】：沖壓焊接成型離心泵具有結構簡單、高效節(jié)能、低泄漏、低噪聲、無銹蝕、壽命長、維護費用低等優(yōu)點,是量大面廣的中小型鑄造成型離心泵的理想替代產(chǎn)品,正廣泛應用于工農(nóng)業(yè)生產(chǎn)生活的各個領域。 目前沖壓泵的設計方法和理論還不是很完善,產(chǎn)品在實際應用中不能達到理想的效果。本文以LDP32-4-8型沖壓多級離心泵作為研究對象,通過對水力模型的CFD數(shù)值模擬和試驗研究,分析了沖壓泵葉輪、導葉及其匹配關系對泵內(nèi)流場和性能的影響情況,為完善沖壓泵設計理論和方法,改善沖壓泵性能提供了參考依據(jù)。本文主要研究工作和成果如下： 1.在查閱大量文獻的基礎上,研究了離心泵葉輪和導葉結構對性能的影響情況,并根據(jù)沖壓泵的結構特點,分析沖壓泵葉輪和導葉的優(yōu)化設計方法。 2.對沖壓泵葉輪葉片與蓋板間隙、葉輪出口邊與軸線夾角、葉輪出口與導葉進口面積比、葉輪到導葉環(huán)形空間的進口面積以及葉輪和導葉的軸向間距5個參數(shù)進行分析,建立相應的研究方案組并進行數(shù)值模擬計算。 3.根據(jù)數(shù)值計算結果,分析各組方案的內(nèi)部流場和性能變化情況。主要結論有： (1)葉輪葉片與蓋板之間存在間隙對泵的性能有較大的影響,較大的間隙值會使泵的揚程和效率急速下降。 (2)沖壓泵葉輪出口邊與軸向存在一定角度可以使泵的效率有所提高,且取θ=30°～40°時泵具有較好的性能。 (3)隨著葉輪出口與導葉進口面積比的增大,沖壓泵的單級揚程和效率逐漸上升,面積比由Y=1.48增大到Y=3.49時,揚程提高約3.0%,效率提高約2.0%。 (4)葉輪到導葉環(huán)形空間進口面積約為導葉進口面積的2倍時泵具有較好的性能。 (5)葉輪與導葉的軸向間距越小,泵的性能越好,間距t=6mm比t=1mm時的揚程下降了1.9%左右,效率下降了1.4%左右。 4.通過與生產(chǎn)企業(yè)合作,選取葉輪出口邊角度及葉輪出口與導葉進口面積比兩組方案進行試驗研究,并對試驗結果和數(shù)值預測結果作對比分析,試驗結果與預測結果基本一致,從而驗證了數(shù)值模擬計算的可靠性。
[Abstract]:Stamping and welding centrifugal pump has the advantages of simple structure, high efficiency and energy saving, low leakage, low noise, no rust, long life, low maintenance cost and so on. It is widely used in various fields of industrial and agricultural production and life. At present, the design method and theory of punching pump are not perfect, and the product can not achieve the ideal effect in practical application. In this paper, the influence of impeller, guide vane and matching relation of impeller and guide vane on the flow field and performance of LDP32-4-8 multi-stage centrifugal pump is analyzed by means of CFD numerical simulation and experimental study of hydraulic model. It provides a reference for improving the design theory and method of punching pump and improving the performance of punching pump. The main research work and results are as follows: 1. The influence of impeller and guide vane structure on the performance of centrifugal pump is studied on the basis of consulting a lot of literatures. According to the structural characteristics of punching pump, the optimum design method of impeller and guide vane of punching pump is analyzed. 2. Five parameters, such as clearance between impeller blade and cover plate, angle between impeller outlet edge and axis line, ratio of impeller outlet to guide vane inlet area, inlet area from impeller to guide vane annular space and axial distance between impeller and guide vane are analyzed. Set up the corresponding research project group and carry on the numerical simulation calculation. 3. According to the results of numerical calculation, the internal flow field and performance change of each group are analyzed. The main conclusions are as follows: (1) the existence of clearance between impeller blade and cover plate has a great influence on the performance of the pump. (2) the pump efficiency can be improved at a certain angle between the outlet edge and axial direction of impeller, and the pump has better performance when 胃 = 30 擄~ 40 擄. (3) with the increase of the ratio of the impeller outlet to the inlet area of the guide vane, the single-stage head and efficiency of the punching pump increase gradually. When the area ratio increases from Yi 1.48 to Y = 3.49, the lift increases about 3.0 and the efficiency increases about 2.0. (4) the pump has better performance when the inlet area of the impeller to the annular space of the guide vane is about 2 times of the inlet area of the guide vane. (5) the smaller the axial distance between the impeller and the guide vane, the better the performance of the pump. The t=6mm distance between the impeller and the guide vane is about 1.9% lower and the efficiency is about 1.4% lower than that of the t=1mm. 4. Through cooperation with production enterprises, two groups of schemes are selected to study the angle of impeller exit edge and the ratio of impeller outlet to guide vane inlet area. The test results and numerical prediction results are compared and analyzed. The experimental results are in good agreement with the predicted results. The reliability of the numerical simulation is verified.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH311

【參考文獻】

相關期刊論文 前10條

1 張學靜;李德明;;多級導葉式離心泵導葉內(nèi)部CFD計算分析[J];甘肅科學學報;2006年03期

2 曹國強,梁冰,包明宇;基于FLUENT的葉輪機械三維紊流流場數(shù)值模擬[J];機械設計與制造;2005年08期

3 熊鰲魁;湍流模式理論綜述[J];武漢理工大學學報(交通科學與工程版);2001年04期

4 劉元義,蔡保元,霍春源,劉加利,王廣業(yè);沖壓焊接多級離心泵的理論研究及工程實現(xiàn)[J];機械工程學報;2005年02期

5 朱自強,張正科,李津,吳子牛,尹幸愉;網(wǎng)格生成和數(shù)值模擬的討論[J];空氣動力學學報;1998年01期

6 辛春宏;馬偉;楊強;;關于沖壓焊接多級離心泵水力設計的研究[J];臨沂師范學院學報;2008年03期

7 虞之日;節(jié)段式多級泵導葉的環(huán)形空間及其設計[J];流體機械;1998年12期

8 錢家祥　,童志成　,陳文正;沖壓泵的特點及其應用[J];流體機械;1999年08期

9 侯樹強,王燦星,林建忠;葉輪機械內(nèi)部流場數(shù)值模擬研究綜述[J];流體機械;2005年05期

10 張華娟;李春;;離心式水泵沖擊損失的計算與分析[J];流體機械;2006年08期

，

本文編號：2391651