一种新型离心泵径向力平衡装置的设计与研究

发布时间：2018-03-18 13:07

本文选题：离心泵　切入点：径向力　出处：《浙江工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：离心泵在偏离设计点工作时会产生很大的径向力,双蜗壳结构虽然能有效地平衡径向力,但其流道狭长,铸造困难。为了更有效地平衡径向力,改善双蜗壳结构铸造难度,本文以IH200-150-400型双蜗壳离心泵为模型。采用CFD数值模拟与试验研究结合的方法对双蜗壳结构进行优化,并提出了一种新型径向力平衡装置。本文主要研究内容和成果如下： 1.以IH200-150-400泵为原模型,运用Pro/e三维设计软件设计了不同结构的离心泵整机流体域模型,利用Fluent前处理工具Gambit对流体域模型进行分块网格划分；介绍了Fluent数值计算的基本方程,确定了适合离心泵内部流场数值计算的解算策略以及叶轮径向力数值计算模型。 2.模拟计算了单蜗壳泵和模型双蜗壳泵在不同流量工况下的径向力,并预测了其水力性能。通过对比分析,表明双蜗壳在非设计工况下能很好地平衡径向力,但相比于单蜗壳泵扬程和效率有所降低,扬程最大下降为1.6m,效率最大下降为2.1%。 3.设计了3种不同隔板长度的双蜗壳泵,研究了隔板长度对径向力平衡的影响,结论表明：随着隔板长度增加,径向力平衡效果得到改善,但并不明显；双蜗壳泵采用较短的隔板时,径向力平衡效果有所降低,但仍能较好地平衡径向力；隔板延伸至隔舌附近时较为合理,隔板再延长对径向力影响非常小,反而增加了铸造难度。 4.基于研究结论短隔板仍能较好地平衡径向力,设计了一种新型多蜗壳结构的径向力平衡装置,并对其展开研究,得出结论：多蜗壳泵能很好地平衡径向力,在流量工况变化时,径向力方向变化幅度小,能更平稳、有效地平衡径向力；扬程、效率和双蜗壳泵非常接近。 5.设计了矩形、梯形和圆形三种不同断面形状的单蜗壳泵和多蜗壳泵,研究了断面形状对径向力平衡效果的影响,结论表明：断面形状对单蜗壳泵和多蜗壳泵径向力平衡都有一定的影响,对泵的扬程和效率也有一定的影响,但影响较小 6.以IH200-150-400型双蜗壳离心泵为试验研究对象,测试了其径向力大小和水力性能,结果表明：试验结果和模拟结果非常接近,验证了数值模拟结果具有可靠性,模拟结果对离心泵径向力平衡结构设计具有一定的指导意义。
[Abstract]:In order to balance the radial force more effectively and improve the casting difficulty of double volute structure, the centrifugal pump produces great radial force when it deviates from the design point. Although the double volute structure can balance the radial force effectively, the flow channel is narrow and narrow, and it is difficult to cast the double volute structure, so as to balance the radial force more effectively and improve the casting difficulty of the double volute structure. In this paper, IH200-150-400 double volute centrifugal pump is used as a model, the structure of double volute is optimized by CFD numerical simulation and experimental study, and a new radial force balancing device is proposed. The main contents and results of this paper are as follows:. 1. Taking the IH200-150-400 pump as the original model, the fluid domain model of the centrifugal pump with different structures is designed by using Pro/e 3D design software, the block mesh of the fluid domain model is divided by Fluent pre-processing tool Gambit, and the basic equations of Fluent numerical calculation are introduced. The numerical calculation strategy and radial force model of impeller are determined for the numerical calculation of flow field in centrifugal pump. 2. The radial forces of the single volute pump and the model double volute pump under different flow conditions are simulated and their hydraulic performance is predicted. The comparison and analysis show that the double volute can balance the radial force well under off-design conditions. Compared with the single volute pump, the lift and efficiency of the pump are decreased, the maximum lift is 1.6 m, and the maximum efficiency is 2.1 m. 3. Three kinds of double volute pump with different partition length are designed, and the influence of diaphragm length on radial force balance is studied. The results show that the radial force balance effect is improved with the increase of partition length, but it is not obvious. The radial force balance effect of double volute pump is reduced, but it can balance the radial force well, and when the diaphragm extends near the tongue, the influence of the partition extension on the radial force is very small, and the casting difficulty is increased. 4. Based on the conclusion that the short diaphragm can balance the radial force well, a new type of radial force balancing device of multi-volute structure is designed and studied. It is concluded that the multi-volute pump can balance the radial force very well. When the flow condition changes, the radial force direction changes little, can balance the radial force more smoothly, and the lift, efficiency and double volute pump are very close. 5. Single volute pump and multi-volute pump with rectangular, trapezoid and circular shapes are designed, and the influence of cross section shape on radial force balance is studied. The results show that the cross section shape has certain influence on radial force balance of single volute pump and multi-volute pump, but has little effect on lift and efficiency of pump. 6. The radial force and hydraulic performance of IH200-150-400 double volute centrifugal pump are tested. The results show that the experimental results are very close to the simulation results, and verify the reliability of the numerical simulation results. The simulation results have certain guiding significance for the design of radial force balance structure of centrifugal pump.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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