排灌机械工程学报2012，Vol.30Issue(6)：677-682,689,7.DOI:10.3969/j.issn.1674-8530.2012.06.012
水泵及泵装置效率换算方法
Efficiency scaling method for pumps and their systems
摘要
Abstract
The theoretical bases of existing efficiency scaling formulas and several scaling methods recommended in some industrial standards for pumps were analyzed. It was found that those formulas are incompletely mathematical expression, experience-dominated and less universal, etc. The hydraulic loss ratios and efficiency at the best efficiency point computed with different efficiency scaling formulas were compared, and it was identified that the efficiency of the prototypes scaled from the models by u-sing Medici's and Fromm's and Moody s formulas shows quite difference compared with the measurements. The efficiency of the prototypes estimated by the rest formulas is less difference from the tests, in which Ackerets formula gives a minimum error. A flow regime-depended efficiency scaling method for pump and its system was put forward, in which three formulas of skin friction factor for three flow regimes were introduced according to essentials of fluid mechanics, and then the corresponding mathematically simplified formulas were proposed for they to be applied conveniently. Based on the internal flow characteristics in pumps, the basis for determining the skin friction factor was analyzed and argued , and influences of the proportional constants of pump performance parameters and skin friction factor on the efficiency scaling were studied; eventually an additional method for estimating the efficiency coefficient was resulted. For the same prototype and model of pump and its system, the efficiencies scaled with those different methods were predicted; the reasons for difference in efficiency esti- mated and feasibility of the methods were analyzed. The results indicate that the proportional constants have less influence on the flow regime-depended efficiency scaling method compared with Ackeret's and Huttons formulas. Thus, as the flow regime-depended efficiency scaling method is applied, the efficiency scaled with a skin friction factor in any flow regimes doesnt seem to show significant difference.关键词
水泵效率/泵装置效率/效率常数/效率换算Key words
pump efficiency/ pump system efficiency/ efficiency coefficient/ efficiency conversion分类
农业科技引用本文复制引用
陆伟刚,严登丰,甄峰..水泵及泵装置效率换算方法[J].排灌机械工程学报,2012,30(6):677-682,689,7.基金项目
国家自然科学基金资助项目(50279045) （50279045）
