【摘要】：沖壓焊接成型離心泵具有結(jié)構(gòu)簡(jiǎn)單、高效節(jié)能、低泄漏、低噪聲、無銹蝕、壽命長(zhǎng)、維護(hù)費(fèi)用低等優(yōu)點(diǎn),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(yīng)用于工農(nóng)業(yè)生產(chǎn)生活的各個(gè)領(lǐng)域。 目前沖壓泵的設(shè)計(jì)方法和理論還不是很完善,產(chǎn)品在實(shí)際應(yīng)用中不能達(dá)到理想的效果。本文以LDP32-4-8型沖壓多級(jí)離心泵作為研究對(duì)象,通過對(duì)水力模型的CFD數(shù)值模擬和試驗(yàn)研究,分析了沖壓泵葉輪、導(dǎo)葉及其匹配關(guān)系對(duì)泵內(nèi)流場(chǎng)和性能的影響情況,為完善沖壓泵設(shè)計(jì)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(xiàn)的基礎(chǔ)上,研究了離心泵葉輪和導(dǎo)葉結(jié)構(gòu)對(duì)性能的影響情況,并根據(jù)沖壓泵的結(jié)構(gòu)特點(diǎn),分析沖壓泵葉輪和導(dǎo)葉的優(yōu)化設(shè)計(jì)方法。 2.對(duì)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(dǎo)葉進(jìn)口面積比、葉輪到導(dǎo)葉環(huán)形空間的進(jìn)口面積以及葉輪和導(dǎo)葉的軸向間距5個(gè)參數(shù)進(jìn)行分析,建立相應(yīng)的研究方案組并進(jìn)行數(shù)值模擬計(jì)算。 3.根據(jù)數(shù)值計(jì)算結(jié)果,分析各組方案的內(nèi)部流場(chǎng)和性能變化情況。主要結(jié)論有： (1)葉輪葉片與蓋板之間存在間隙對(duì)泵的性能有較大的影響,較大的間隙值會(huì)使泵的揚(yáng)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(shí)泵具有較好的性能。 (3)隨著葉輪出口與導(dǎo)葉進(jìn)口面積比的增大,沖壓泵的單級(jí)揚(yáng)程和效率逐漸上升,面積比由Y=1.48增大到Y(jié)=3.49時(shí),揚(yáng)程提高約3.0%,效率提高約2.0%。 (4)葉輪到導(dǎo)葉環(huán)形空間進(jìn)口面積約為導(dǎo)葉進(jìn)口面積的2倍時(shí)泵具有較好的性能。 (5)葉輪與導(dǎo)葉的軸向間距越小,泵的性能越好,間距t=6mm比t=1mm時(shí)的揚(yáng)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(dǎo)葉進(jìn)口面積比兩組方案進(jìn)行試驗(yàn)研究,并對(duì)試驗(yàn)結(jié)果和數(shù)值預(yù)測(cè)結(jié)果作對(duì)比分析,試驗(yàn)結(jié)果與預(yù)測(cè)結(jié)果基本一致,從而驗(yàn)證了數(shù)值模擬計(jì)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(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】：2011
【分類號(hào)】：TH311

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