基于CFD的带分流叶片离心风泵结构优化研究

发布时间：2018-01-02 03:29

本文关键词：基于CFD的带分流叶片离心风泵结构优化研究　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：离心泵由于结构简单、易于操作、运行可靠、适用范围广等特点,成为各种泵中应用最为广泛的一种,并且随着社会经济的发展,对离心泵的性能提出了越来越高的要求,如偏工况稳定运行、低振动噪声以及高可靠性要求等。而在诸多离心泵优化设计的方法中,添加分流叶片设计法是当前离心泵设计方法中较为有效的方法之一。其采用了长、短叶片间隔放置,从而有效改善叶轮内部流场分布,提高叶轮压比,防止二次流、回流、射流尾迹等不良现象的发生,提高离心泵性能和运行稳定性,是改善离心叶轮机械综合性能的有效方法。本文运用成熟的CFD商用软件FLUENT14.5,以某款商用洗碗机内离心风泵为研究对象,通过数值计算的手段对比不同叶轮模型风泵内外性能,从分流叶片的周向分布,分流叶片长度,分流叶片偏转角度,长叶片、分流叶片的数目这4个因素来研究分流叶片对整机性能的影响。本文首先根据离心风泵模型各部件几何结构参数,采用三维建模软件PRO/E分别对该风泵模型的各个组成部分建模,装配完成后导入ICEM CFD进行网格划分。通过对比3种湍流模型计算成本及精度,最终选择标准k-ε模型作为本文数值计算的湍流模型,分别对该离心风泵在不同流量工况下进行数值计算,并对比了实验与计算结果之间的风压-流量曲线,验证本文使用计算方法和计算模型的可靠性。本文利用数值模拟计算提供该离心风泵内部流场的信息,包括叶轮内的压力分布、湍动能分布、相对速度分布等,通过这些内部流场信息结合计算结果,以提高风泵出口压力及效率为优化目标,来研究分流叶片各几何参数,如分流叶片周向分布,分流叶片长度、偏转角度及叶片数对整机性能的影响。最终得出使该离心风泵具有最佳性能的各几何参数的最优取值。新设计出的新离心风泵模型风压在全流量工况范围内相比原模型风泵提高了8.7%,效率也提高了3.3%。本文运用数值模拟计算的手段探讨了分流叶片对离心风泵内部流场和性能的影响机理,其不受实验条件的限制,对今后离心泵的设计提供了理论参考。
[Abstract]:The centrifugal pump has the advantages of simple structure, easy operation, reliable operation, wide application range, has become one of the most widely used in all kinds of pumps, and with the development of social economy, put forward higher requirements on the performance of the centrifugal pump, such as partial condition of stable operation, low noise and high reliability etc. while in many centrifugal pump optimization design method, adding splitter blades design method is one of the effective method of the current design method of centrifugal pump. The long and short blade spacing, so as to improve the internal flow field distribution of impeller, improve the impeller pressure ratio, prevent the two flow, backflow, jet wake and other bad the occurrence of the phenomenon, improve the performance of centrifugal pump and the operation stability, is an effective method to improve the comprehensive performance of the centrifugal impeller machinery. This paper uses the mature commercial CFD software FLUENT14.5, using a commercial dishwasher centrifuge Air compressor as the research object, by means of comparing the different numerical model of air compressor impeller internal and external performance, from the splitter blade circumferential distribution, splitter blade length, splitter blade deflection angle, long blade, the 4 factors the number of splitter blades to study the influence on the performance of the splitter blade. Firstly, according to various parts of the centrifugal pump model the geometrical structure parameters, the 3D modeling software PRO/E of the air compressor model each part of the model, after the completion of the assembly into the ICEM CFD grid. By comparing the 3 kinds of turbulence model to calculate the cost and accuracy, the standard k- e turbulence model chosen as the numerical calculation model of the centrifugal pump, respectively in different flow conditions by numerical calculation, and compared the wind pressure between the experimental and calculated results of the flow curve, verify the use of the calculation method and model can be By simulation. This paper provides the information of the internal flow field of centrifugal pump including impeller using numerical pressure distribution in turbulent kinetic energy distribution, velocity distribution, the flow field information combined with the results, in order to improve the pump outlet pressure and efficiency as the optimization objective, to study the splitter blade geometry parameters, such as the splitter blades the circumferential distribution, length of splitter blades, influence of deflection angle and number of leaves on the performance of the optimal value. Finally the geometric parameters of the centrifugal pump which has the best performance of the new model. The new design pressure of centrifugal pump in the whole range of flow condition compared to the original model of air compressor is increased by 8.7%, but also improves the efficiency of 3.3%. this paper uses numerical simulation method to research mechanism of influence of splitter blades on the flow field and the performance of the centrifugal pump inside, the restriction of experimental conditions for the future from the The design of the heart pump provides a theoretical reference.

【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH311

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