串并联泵内部流场特性研究
发布时间：2019-02-24 11:31
【摘要】：串并联离心泵是一种通过中间换向阀实现小流量高扬程和大流量低扬程两种工况的新型离心泵,可用作船舶的重要保安设备,及时有效地输送液体以保证船舶的安全。本文以一台串并联离心泵为模型,采用数值模拟的方法,研究了该泵在额定工况下的内部流动特性,并对不同叶片数和不同叶片出口安放角叶轮方案下的串并联离心泵内部流动特性进行了研究。 本文首先对CFD和压力脉动的相关理论进行了初步介绍,并对串并联泵的关键部件进行了设计,对串并联泵进行建模和网格划分,通过对不同网格数和不同湍流模型的模型进行计算,确定了适合此模型的网格数目和湍流模型,并将试验外特性曲线与数值计算结果对比,验证了数值计算结果的可靠性,并分析了串并联泵的内部流场特性。通过对非定常数值计算结果的分析,研究了串并联泵内部流场的压力脉动特性,并研究了不同叶片数和不同叶片出口安放角对相应位置压力脉动规律的影响,发现叶片数和叶片出口安放角均会影响泵内的以叶频及其倍频为特征频率处的压力脉动幅值,但是对压力脉动幅值影响规律不同,为串并联离心泵以降低压力脉动为目标的优化设计及泵的减振降噪研究提供了一定的参考依据。
[Abstract]:Series-parallel centrifugal pump is a new type of centrifugal pump, which can realize two working conditions of small flow, high head and large flow and low lift by means of intermediate directional valve. It can be used as an important security equipment for ships and can transport liquid in time and effectively to ensure the safety of ships. In this paper, a series-parallel centrifugal pump is used as a model, and the internal flow characteristics of the pump under rated working conditions are studied by means of numerical simulation. The internal flow characteristics of series and parallel centrifugal pumps with different blade numbers and different blade outlet placement angle impellers are studied. In this paper, the related theories of CFD and pressure pulsation are introduced, and the key components of series-parallel pump are designed, and the modeling and meshing of series-parallel pump are carried out. Through the calculation of different meshes and different turbulence models, the number of meshes and turbulence models suitable for this model are determined, and the experimental external characteristic curves are compared with the numerical results to verify the reliability of the numerical results. The characteristics of the internal flow field of the series-parallel pump are analyzed. Based on the analysis of the unsteady numerical results, the pressure pulsation characteristics of the flow field in the series and parallel pumps are studied, and the influence of different blade numbers and blade outlet placement angles on the pressure pulsation law of the corresponding position is studied. It is found that both the blade number and the blade outlet angle will affect the amplitude of pressure pulsation at the characteristic frequency of blade frequency and frequency doubling, but the effect on the amplitude of pressure pulsation is different. It provides a certain reference for the optimization design of series-parallel centrifugal pump aimed at reducing pressure pulsation and the research of vibration and noise reduction of the pump.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH311
本文编号：2429509
[Abstract]:Series-parallel centrifugal pump is a new type of centrifugal pump, which can realize two working conditions of small flow, high head and large flow and low lift by means of intermediate directional valve. It can be used as an important security equipment for ships and can transport liquid in time and effectively to ensure the safety of ships. In this paper, a series-parallel centrifugal pump is used as a model, and the internal flow characteristics of the pump under rated working conditions are studied by means of numerical simulation. The internal flow characteristics of series and parallel centrifugal pumps with different blade numbers and different blade outlet placement angle impellers are studied. In this paper, the related theories of CFD and pressure pulsation are introduced, and the key components of series-parallel pump are designed, and the modeling and meshing of series-parallel pump are carried out. Through the calculation of different meshes and different turbulence models, the number of meshes and turbulence models suitable for this model are determined, and the experimental external characteristic curves are compared with the numerical results to verify the reliability of the numerical results. The characteristics of the internal flow field of the series-parallel pump are analyzed. Based on the analysis of the unsteady numerical results, the pressure pulsation characteristics of the flow field in the series and parallel pumps are studied, and the influence of different blade numbers and blade outlet placement angles on the pressure pulsation law of the corresponding position is studied. It is found that both the blade number and the blade outlet angle will affect the amplitude of pressure pulsation at the characteristic frequency of blade frequency and frequency doubling, but the effect on the amplitude of pressure pulsation is different. It provides a certain reference for the optimization design of series-parallel centrifugal pump aimed at reducing pressure pulsation and the research of vibration and noise reduction of the pump.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH311
【参考文献】
相关期刊论文 前10条
1 徐朝晖,吴玉林,陈乃祥,刘宇,张梁,吴玉珍;基于滑移网格与RNG湍流模型计算泵内的动静干扰[J];工程热物理学报;2005年01期
2 马士虎,余栋高,谢江辉,蒋青,王晓东,汪国祥;新型串并联双级离心泵研制[J];船舶工程;2002年06期
3 于萍 ,孙卫平 ,杨志军;船用潜水式串并联离心泵的设计与研究[J];机电设备;2002年04期
4 孙卫平,周华青,王震敏,杜云水;潜水型消防排水泵的自动控制系统[J];机电设备;2003年01期
5 徐朝晖,吴玉林,陈乃祥,刘宇,张梁;高速泵内三维非定常动静干扰流动计算[J];机械工程学报;2004年03期
6 姚志峰;王福军;杨敏;瞿丽霞;肖若富;徐旭东;何成连;;叶轮形式对双吸离心泵压力脉动特性影响试验研究[J];机械工程学报;2011年12期
7 王秀勇;王灿星;;基于数值模拟的离心泵性能预测[J];流体机械;2007年10期
8 周岭;施卫东;陆伟刚;李辉;裴冰;;深井离心泵内部非定常流动的压力脉动特性分析[J];农业工程学报;2011年10期
9 裴吉;王文杰;袁寿其;孟凡;陈佳;;低比转数离心泵内部非定常流动特性数值预测[J];农业机械学报;2014年01期
10 裴吉;袁寿其;袁建平;王文杰;;单叶片离心泵压力脉动强度多工况对比研究[J];华中科技大学学报(自然科学版);2013年12期
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