
轴向平移叶轮前盖板对离心泵性能影响的研究
赵万勇, 梁允昇, 彭虎廷, 马得东
轴向平移叶轮前盖板对离心泵性能影响的研究
Research on the Influence of Axial Moving Impeller Shroud on Centrifugal Pump Performance
目前提灌泵站普遍存在泵组工作流量大于管网系统所需,水泵长时间工作在偏工况的问题,变频控制系统改造过于昂贵,而切割叶轮外径使离心泵扬程下降严重不利于多泵并联。针对黄河提灌用泵普遍采用钢板成型叶片组焊叶轮,焊接前切割叶片,平移叶轮前盖板,改变离心泵水力性能的方法变得方便可行。以中比转速单级双吸离心泵为研究对象,轴向平移叶轮前盖板改变其叶轮流道的形状,并进行三维数值模拟,分析离心泵外特性随着前盖板移动而变化的趋势,并通过研究内流场分析其性能的变化机理。研究结果表明:随着前后盖板间距减小,离心泵扬程降低,H~Q曲线向下移动且变得陡峭。轴向平移叶轮前盖板使离心泵η~Q曲线整体向小流量工况移动,最高效率大小与高效区宽度近似保持不变。通过对离心泵内流场变化的研究结合理论分析,得出了离心泵扬程与效率随前盖板移动而变化的机理。轴向平移叶轮前盖板减小离心泵流量的同时维持较高的扬程与效率,具有一定的工程价值。
Nowadays, drainage and irrigation pumping stations generally have the problem that the working flow of the pump set is greater than the pipe network system needs, and the pump is working at a point deviating from the optimal working condition. The transformation of the frequency conversion control system is too expensive, and cutting the outer diameter of the impeller causes a serious drop in the lift of the centrifugal pump, which is not conducive to the parallel operation of the centrifugal pumps. For the pumps of the Yellow River irrigation generally uses steel blade and welded impellers. If it is before welding, cutting the blades and moving the shroud of the impeller axially can easily change the hydraulic performance of the centrifugal pump. The medium specific speed double-suction centrifugal pump is taken as the research object, the front cover of the impeller axially is moved to change the shape of the impeller flow channel. The trend of the external characteristics of the centrifugal pump changing with the movement of the front cover is analyzed by numerical simulation, and the change mechanism of its performance is analyzed by studying the internal flow field. The results show that as the distance between the front cover and the rear cover of the impeller decreases, the head of the centrifugal pump decreases, and the H~Q curve moves downward and becomes steep. The axial translation of the front cover of the impeller makes the centrifugal pump η~Q curve move to the small flow condition as a whole, and the maximum efficiency and the width of the high efficiency zone remain approximately unchanged. By studying the changes of the flow field in the centrifugal pump and theoretical analysis, the mechanism of the head and efficiency of the centrifugal pump changing with the movement of the front cover is obtained. Moving the front cover of the impeller axially can reduce the flow rate of the centrifugal pump while maintaining a higher head and efficiency, which has certain engineering value.
双吸离心泵 / 叶轮切割 / 叶轮出口宽度 / 数值模拟 {{custom_keyword}} /
double-suction centrifugal pump / impeller trim / impeller outlet width / numerical simulation {{custom_keyword}} /
1 |
宇晓明,顾伯勤,邵春雷.叶轮切割形式对中比转数离心泵性能的影响[J].农业工程学报,2012,28(21):29-36.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
2 |
杨从新,富友,强盼,等.不同压出室下叶轮切割对离心泵性能的影响[J].排灌机械工程学报,2015,33(9):750-755,767.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
3 |
王鹏,袁寿其,王秀礼,等.叶片V型切割对双吸离心泵性能影响研究[J].中国农村水利水电,2014(12):100-103,108.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
4 |
{{custom_citation.content}}
{{custom_citation.annotation}}
|
5 |
杨从新,杨藤,刘满.叶轮直径对双蜗壳离心泵压力脉动特性的影响[J].中国农村水利水电,2020(5):139-144.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
6 |
郝英杰,顾伯勤,邵春雷.叶轮切割方式对离心泵外特性和压力脉动的影响[J].南京工业大学学报(自然科学版),2015,37(5):42-47.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
7 |
司乔瑞,袁寿其,袁建平.叶轮隔舌间隙对离心泵性能和流动噪声影响的试验研究[J].振动与冲击,2016,35(3):164-168,191.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
8 |
谈明高,陆友东,吴泽瑾,等.叶片数对离心泵振动噪声性能的影响[J].农业工程学报,2019,35(23):73-79,320.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
9 |
冷洪飞,王福军,姚志峰,等.双吸泵叶轮切削后效率下降机理及切削定律[J].农业工程学报,2013,29(20):67-73,293-294.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
10 |
{{custom_citation.content}}
{{custom_citation.annotation}}
|
11 |
万伦,宋文武,罗旭,等.叶片出口安放角对中比转速离心泵非定常性能的影响研究[J].中国农村水利水电,2020(7):225-230.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
12 |
王洋,刘洁琼.超低比转数离心泵叶轮切割的三维流场数值模拟[J].农业机械学报,2012,43(5):79-83.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
13 |
李万军,刘德顺,金永平.高比转数双吸离心泵叶轮切割内部流场数值模拟[J].水电能源科学,2013,31(8):144-148.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
14 |
汪岩飞,田亚平,陶承军,等.背叶片宽度对离心泵水力性能与流场的影响研究[J].中国农村水利水电,2020(6):111-115.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
15 |
赵万勇,陈帅,赵强,等.蜗壳断面面积变化规律对双吸离心泵水力性能的影响[J].排灌机械工程学报,2020,38(9):871-877.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
16 |
邱昊,李志鹏,肖响.基于偏置分流叶片低比转速离心泵压力脉动特征研究[J].中国农村水利水电,2020(6):98-104.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
17 |
朱相源,江伟,李国君,等.导叶与隔舌相对位置对离心泵水力性能影响的数值研究[J].武汉大学学报(工学版),2018,51(1):72-79.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
18 |
关醒凡.现代泵设计手册[M].北京:宇航出版社,1995.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
19 |
袁寿其,袁建平,裴吉,等.离心泵内部流动与运行节能[M]. 北京:科学出版社,2016.
{{custom_citation.content}}
{{custom_citation.annotation}}
|
{{custom_ref.label}} |
{{custom_citation.content}}
{{custom_citation.annotation}}
|
/
〈 |
|
〉 |