排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (1): 18-25    DOI: 10.3969/j.issn.1674-8530.15.0034
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
塑料井泵新型轴向导叶设计及内部压力脉动特性
徐媛晖, 张启华, 施卫东, 陆伟刚, 王川, 周岭
江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013
Design of new type diffuser of plastic well pump and pulsation characteristics of internal pressure
XU Yuanhui, ZHANG Qihua, SHI Weidong, LU Weigang, WANG Chuan, ZHOU Ling
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 设计开发了一种新型轴向导叶,基于CFD方法进行了全流场三维定常和非定常数值模拟,探讨了该新型轴向导叶内部的压力脉动现象,得到了额定工况下首级叶轮出口、次级叶轮出口、首级导叶内部和次级导叶内部压力脉动特性,并通过快速傅里叶变换进行了频域分析.结果表明:与空间导叶相比,轴向导叶水力性能略低,但较径向导叶有很大优势;新型轴向导叶的压力脉动产生于叶轮出口与导叶进口交界处,且在向导叶传输的过程中脉动信号呈衰减趋势;从导叶进口至导叶出口,导叶内的压力脉动幅值明显降低,表明该轴向导叶压力转换能力强;次级轴向导叶内压力脉动幅值低于首级导叶;各监测点主频均与叶频相等或为叶频整数倍,首级导叶和次级导叶内频域分布存在一定差别.
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徐媛晖
张启华
施卫东
陆伟刚
王川
周岭
关键词塑料井泵   新型轴向导叶   导叶设计   压力脉动   数值模拟     
Abstract: A new type axial diffuser is devised and the unsteady, three-dimensional and turbulent flow field in a plastic well pump with this diffuser is simulated based on a CFD method to exploit the internal pressure pulsation phenomenon in the diffuser. The pulsation characteristics of pressure at the first and second stage impeller outlets as well as inside the first and second stage diffuses are obtained under the duty flow rate conditions; meanwhile, the frequency fluctuation of pressure is analyzed by fast Fourier transform. Compared with a bowl diffuser, the hydraulic performance of the axial diffuser is slightly poorer, but much better than a radial diffuser. The maximum pressure pulsation occurs at the interface between the impeller and the axial diffuser, and the magnitude of the pulsation declines when the fluid passes the diffuser. From the inlet to the outlet, the amplitude of pressure pulsation in the axial diffuser is significantly reduced, indicating an excellent pressure recovery capability. In addition, the amplitude of pressure pulsation in the second stage diffuser is lower than that in the first stage. The dominant frequency at various monitoring points is equal to the blade passing frequency or is an integer multiple of the frequency. There are some differences in the frequency domain distribution from the first stage diffuser to the second stage one.
Key wordsplastic well pump   new axial guide vane   guide vane design   pressure pulsation   numerical simulation   
收稿日期: 2015-03-02;
基金资助:

国家自然科学基金资助项目(51309118,51279069);江苏省自然科学基金资助项目(BK20130527);现代农业装备与技术教育部重点实验室开放基金资助项目(NZ201305)

通讯作者: 张启华(1978—),男,江苏南通人,副研究员,博士(通信作者,qihua05@163.com),主要从事节能节材深井泵研究.   
作者简介: 徐媛晖(1990—),女,江苏南通人,硕士(xuyuanhui1118@163.com),主要从事深井离心泵优化设计研究.
引用本文:   
徐媛晖,张启华,施卫东等. 塑料井泵新型轴向导叶设计及内部压力脉动特性[J]. 排灌机械工程学报, 2016, 34(1): 18-25.
XU Yuan-Hui,ZHANG Qi-Hua,SHI Wei-Dong et al. Design of new type diffuser of plastic well pump and pulsation characteristics of internal pressure[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(1): 18-25.
 
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