慎江泵站特低扬程大流量竖井贯流泵装置外特性试验研究  

Experimental Study on External Characteristics of Ultra-low Lift and Large-flow Shaft Tubular Pump

作　　者：陆伟刚[1] 周秉南 夏辉[2] 徐磊[1] 徐波 LU Weigang;ZHOU Bingnan;XIA Hui;XU Lei;XU Bo(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;Jiangsu Surveying and Design Institute of Water Resources Co.,Ltd.,Yangzhou 225127,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]江苏省水利勘测设计研究院有限公司,江苏扬州225127

出　　处：《灌溉排水学报》2021年第4期52-59,共8页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51779215,52079120,51409227)。

摘　　要：【目的】检验特低扬程大流量泵站中竖井贯流泵装置的水力性能,了解泵站的真实运行情况。【方法】采用模型试验的方法,研究了慎江泵站竖井贯流泵装置的外特性,并分析数据提出了改进方案。【结果】泵装置的最高效率出现在叶片角0°工况,可达77.57%,此时泵装置流量为220.5 L/s,扬程为1.95 m。在试验扬程范围内,慎江泵站的装置汽蚀余量充裕,不会产生汽蚀危害。在叶片角为0°时,最大扬程为2.93 m时,飞逸转速相当于额定转速的1.80倍。原方案设计扬程工况下,泵装置的流量偏小,而且在最大扬程工况下的飞逸转速偏大,对泵站安全运行不利。提出提高泵装置额定转速的优化方案,验证得在新转速下泵装置设计扬程对应的能量特性、汽蚀特性以及飞逸转速特性均满足要求。【结论】竖井贯流泵装置水力性能优异,装置效率高,在特低扬程泵站中前景良好,建议优先采用。【Background】Shaft tubular pump is a new pumping device with its generator installed in an open shaft,which is moisture-proof and has good ventilation.It has several advantages including easy operation and maintenance,low cost,and simple structure.It is generally used in low-lift and large-flow pumping stations.The development in shaft tubular pump has made it a favorable choice for ultra-low lift and large-flow pumping stations like Shenjiang Pumping Station for regional flood and drainage control.【Objective】The purpose of this paper is to test in situ hydraulic performance of shaft tubular pump in ultra-low lift and large-flow pumping station.【Method】We took Shenjiang Pumping Station as an example;the external characteristics of its shaft tubular pump were studied using the method of model test,from which we propose plans to improve it.【Result】When the blade angle was 0°,the pump was most efficient,reaching 77.57%,with the flow rate and lift being 220.5 L/s and 1.95 m respectively.In the range of the lifts we tested,the pumping station had sufficient cavitation margin and did not cause cavitation damage.When the blade angle was 0°and maximum lift was 2.93 m,the runaway speed was 1.80 times the rated speed.The flow in the original design was too slow while its associated runaway speed under maximum lift was too large,not ideal for safe operation of the pumping station.An optimization scheme for increasing the rated speed of the pump was proposed.Verification against experimental data showed that the energy and cavitation characteristics,runaway speed all met the requirements.【Conclusion】The shaft tubular pump has a good hydraulic performance and efficiency,and it is potential for use in ultra-low lift pump stations.

关 键 词：泵装置 模型试验 竖井贯流泵 外特性 特低扬程大流量泵站 

分 类 号：TV131.63[水利工程—水力学及河流动力学] TV675