排灌机械工程学报
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排灌机械工程学报  2015, Vol. 33 Issue (7): 566-571    DOI: 10.3969/j.issn.1674-8530.14.0108
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多级离心泵内部级间影响及压力脉动特征
康灿, 杨鑫, 于晓杰
江苏大学能源与动力工程学院, 江苏 镇江 212013
Inter-stage interaction and unsteady flow characteristics in multistage centrifugal pump
Kang Can, Yang Xin, Yu Xiaojie
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 为了研究多级离心泵内级间相互影响及流道内的瞬时流动特征,对一两级泵内部流动进行了三维定常与非定常数值计算,获得并分析了不同流量工况条件下流道内各个监测点的压力脉动特征.研究表明:首级导叶的存在是导致次级叶轮入口截面上不均匀流动状态的关键因素;在每级叶轮的出口与导叶进口联结处均存在剧烈的动静耦合作用;尽管整体流道的几何形状复杂,叶片通过频率仍支配着该两级泵内全流道的特征压力脉动,而导叶叶片数对压力脉动特征的影响较弱;叶轮内与叶频对应的压力脉动幅值自叶轮进口到叶轮出口逐渐增大,且在叶轮出口处达到极大值,导叶中的相应变化规律则与之相反;偏离最优流量工况,叶频仍占据统治地位,但整个流道内的压力脉动幅值增大,该趋势在小流量工况下尤为明显.
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康灿
杨鑫
于晓杰
关键词多级离心泵   级间影响   压力脉动   特征频率   数值模拟     
Abstract: To analyze inter-stage interaction and transient flow characteristics in a multistage centrifugal pump, numerical simulations of both steady and unsteady, three-dimensional turbulent flow in a two-stage centrifugal pump are conducted. Pressure fluctuations at monitoring points in both the impeller and diffuser passages are obtained at different flow rates. The results show that the first-stage diffuser is the key factor for determining the non-uniform velocity distribution at the inlet of the second-stage impeller. There is a strong rotor-stator interaction between the impeller outlet and diffuser inlet in each stage. Even though the geometrical shape of the whole flow passage is so complicated, the blade pas-sing frequency is still the dominating factor that decides the pressure fluctuation characteristics in the entire flow passage in the pump. By contrast, the pressure fluctuations are less affected by the number of diffuser vanes. The pressure fluctuation amplitude at the blade passing frequency within the impeller passages increases gradually from the impeller inlet to the outlet, but vice versa in the diffuser. The pressure fluctuation amplitude at the blade passing frequency is still dominated at low and high flow rates, however, the fluctuation amplitude is amplified, especially at the low flow rate. 
Key wordsmulti-stage centrifugal pump   inter-stage interaction   pressure fluctuation   characteristic frequency   numerical simulation   
收稿日期: 2014-07-13;
基金资助:江苏高校优势学科建设工程项目
通讯作者: 杨鑫(1989—),男,江苏徐州人,硕士研究生(通信作者,xinyang0315@126.com),主要从事叶片泵内部流动数值模拟研究.   
作者简介: 康灿(1978—),男,河北宁晋人,副教授(kangcan@ujs.edu.cn),主要从事流体机械内部复杂流动研究.
引用本文:   
康灿,杨鑫,于晓杰. 多级离心泵内部级间影响及压力脉动特征[J]. 排灌机械工程学报, 2015, 33(7): 566-571.
KANG Can,YANG Xin,YU Xiao-Jie. Inter-stage interaction and unsteady flow characteristics in multistage centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(7): 566-571.
 
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