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| 用能量特性评价水泵机组水力稳定性 | |
| 引用本文： | 张仁田,朱红耕,姚林碧,魏军.用能量特性评价水泵机组水力稳定性[J].排灌机械,2008,26(6). |
| 作者姓名： | 张仁田 朱红耕 姚林碧 魏军 |
| 作者单位： | 1. 扬州大学水利科学与工程学院,江苏,扬州,225009;江苏省水利勘测设计研究院有限公司,江苏,扬州,225009 2. 扬州大学水利科学与工程学院,江苏,扬州,225009 3. 江苏省水利勘测设计研究院有限公司,江苏,扬州,225009 |
| 基金项目： | "十五"国家重大技术装备研制项目( ， 水利部"948"项目 |
| 摘 要： | 为了评价大型低扬程水泵在设计和非设计工况下运行的稳定性,根据水泵设计理论,分析了非设计工况下影响水力稳定性的主要因素,包括进口预旋、出口环量、轴向旋涡和脱流等,进而从水泵的基本方程出发,提出了"虚拟最优工况"的概念,建立了以水泵能量特性来计算水力不稳定性即紊流损失的方程式,据此对不同比转速的叶轮进行了紊流损失计算,并与模型实测的压力脉动进行了对比,两者有较好的一致性.这一结果表明,采用能量特性评价水泵机组运行稳定性的方法是可行的. |
| 关 键 词： | 泵 能量特性 水力稳定性 紊流损失 评价 |
Pump hydraulic stability appraisal by means of energy performances |
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| ZHANG Ren-tian,ZHU Hong-geng,YAO Lin-bi,WEI Jun.Pump hydraulic stability appraisal by means of energy performances[J].Drainage and Irrigation Machinery,2008,26(6). | |
| Authors: | ZHANG Ren-tian ZHU Hong-geng YAO Lin-bi WEI Jun |
| Institution: | ZHANG Ren-tian1,2,ZHU Hong-geng1,YAO Lin-bi2,WEI Jun1 |
| Abstract: | In order to evaluate the operational stability of large-scale low-head pumps in design and off-design conditions,based on the basic design theory of blade pumps,main factors affecting their hydraulic stabilities are analyzed,including inlet pre-swirl,outlet circulation axial-vortex and flow separation.Starting from the fundamental equations of blade pumps,a new concept of optimized operational condition was presented.According to the pump energy performances the equations of calculating turbulent losses for appraising pump hydraulic instability are formulated.Some calculations of various specific speeds are made to compare the measured pressure fluctuations with the calculated turbulent losses,and the identical results are obtained.It indicates that the methodology of pump operational stability appraisal by means of energy performances is feasible and realizable. |
| Keywords: | pump energy performance hydraulic stability turbulent loss appraisal |
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