排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (6): 461-468    DOI: 10.3969/j.issn.1674-8530.17.0080
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  
叶片进口边穿孔对离心泵空化性能的影响
赵伟国1,2,潘绪伟1,2*,宋启策1,2,李尚升1,2
1. 兰州理工大学能源与动力工程学院, 甘肃 兰州 730050;2. 甘肃省流体机械及系统重点实验室, 甘肃 兰州 730050
Effect of blade perforation near inlet edge on the cavitation performance of centrifugal pump
ZHAO Weiguo1,2,PAN Xuwei1,2*,SONG Qice1,2,LI Shangsheng1,2
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;2. Key Laboratory of Fluid Machinery and System, Gansu Province, Lanzhou, Gansu 730050, China
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摘要 为了研究叶片进口边位置附近穿孔对离心泵非定常空化性能的影响规律,以某离心泵为研究对象,在叶片进口边同一位置设计了10种孔径大小不同的圆孔,基于SST k-ω湍流模型和Zwart空化模型,分别对这10种叶轮的离心泵进行清水介质下的全流道三维非定常数值模拟,并同试验结果进行对比.研究发现,对于低比转数离心泵而言,在进口边气泡最先产生的位置进行叶片穿孔(该位置距叶片头部距离约占整个叶片长度的1/30),当穿孔直径为8 mm时,不仅扬程、效率得到提高,而且可显著地提高离心泵的空化性能;穿孔叶片将每个叶轮流道内整体的空化区截断成了2个空化区,随着孔径的增大,叶轮内低压区分布范围先减小后增大,当孔径为8 mm时,低压区的分布范围最小;叶片穿孔后叶轮内压力脉动幅值明显大于原型叶片且穿孔对流场的影响作用随着与穿孔位置距离的增大而逐渐减弱,在蜗壳内穿孔对流场的影响作用完全消失.
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赵伟国
潘绪伟
*
宋启策
李尚升
关键词离心泵   穿孔   空化   压力脉动     
Abstract: In order to explore the influence of the blade perforation near the inlet edge on cavitation performance of a centrifugal pump, a low specific-speed centrifugal pump was selected as the research object. Ten different sizes of pores were designed in the same place of blade inlet edge in the centrifugal pump. Based on SST k-ω turbulent model and Zwart cavitation model, under the condition of water medium, 10 different impellers were numerically simulated in the full flow passage and compared with the experimental results. The research shows that the blade perforation with the diameter of 8 mm near the inlet edge whose bubbles generates firstly improves not only head and efficiency but also cavitation performance remarkably. The blade perforation divides the general cavitation region into two in every flow passage. With the increase of pore, the low pressure area in runner reduces, then increases. The distribution of low-pressure area is the smallest when the diameter is 8 mm near the blade inlet edge. The amplitude of pressure fluctuation of perforated blade is apparently larger than that of prototype blade. With the increase of perforated position distance,the influence of perforated blade on flow field gradually decreases and disappeares completely at last in the volute.
Key wordscentrifugal pump   perforation   cavitation   pressure fluctuation   
收稿日期: 2017-04-16;
基金资助:国家自然科学基金资助项目(51269011);甘肃省自然科学基金资助项目(18JR3RA149)
引用本文:   
赵伟国,,潘绪伟等. 叶片进口边穿孔对离心泵空化性能的影响[J]. 排灌机械工程学报, 2019, 37(6): 461-468.
ZHAO Wei-Guo-,,PAN Xu-Wei- et al. Effect of blade perforation near inlet edge on the cavitation performance of centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(6): 461-468.
 
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