冲压泵叶轮出口与导叶进口匹配的设计与研究
发布时间：2018-12-25 21:09
【摘要】：冲压焊接成型离心泵具有结构简单、高效节能、低泄漏、低噪声、无锈蚀、寿命长、维护费用低等优点,是量大面广的中小型铸造成型离心泵的理想替代产品,正广泛应用于工农业生产生活的各个领域。 目前冲压泵的设计方法和理论还不是很完善,产品在实际应用中不能达到理想的效果。本文以LDP32-4-8型冲压多级离心泵作为研究对象,通过对水力模型的CFD数值模拟和试验研究,分析了冲压泵叶轮、导叶及其匹配关系对泵内流场和性能的影响情况,为完善冲压泵设计理论和方法,改善冲压泵性能提供了参考依据。本文主要研究工作和成果如下： 1.在查阅大量文献的基础上,研究了离心泵叶轮和导叶结构对性能的影响情况,并根据冲压泵的结构特点,分析冲压泵叶轮和导叶的优化设计方法。 2.对冲压泵叶轮叶片与盖板间隙、叶轮出口边与轴线夹角、叶轮出口与导叶进口面积比、叶轮到导叶环形空间的进口面积以及叶轮和导叶的轴向间距5个参数进行分析,建立相应的研究方案组并进行数值模拟计算。 3.根据数值计算结果,分析各组方案的内部流场和性能变化情况。主要结论有： (1)叶轮叶片与盖板之间存在间隙对泵的性能有较大的影响,较大的间隙值会使泵的扬程和效率急速下降。 (2)冲压泵叶轮出口边与轴向存在一定角度可以使泵的效率有所提高,且取θ=30°～40°时泵具有较好的性能。 (3)随着叶轮出口与导叶进口面积比的增大,冲压泵的单级扬程和效率逐渐上升,面积比由Y=1.48增大到Y=3.49时,扬程提高约3.0%,效率提高约2.0%。 (4)叶轮到导叶环形空间进口面积约为导叶进口面积的2倍时泵具有较好的性能。 (5)叶轮与导叶的轴向间距越小,泵的性能越好,间距t=6mm比t=1mm时的扬程下降了1.9%左右,效率下降了1.4%左右。 4.通过与生产企业合作,选取叶轮出口边角度及叶轮出口与导叶进口面积比两组方案进行试验研究,并对试验结果和数值预测结果作对比分析,试验结果与预测结果基本一致,从而验证了数值模拟计算的可靠性。
[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 掳~ 40 掳. (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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
本文编号：2391651
[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 掳~ 40 掳. (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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
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