低扬程泵装置选型设计一些问题的思考

The Selection and Design for Low Head Pump System

从泵装置效率和流道效率的定义出发,分析了影响低扬程泵装置效率的主要因素,提出可采用流道水力损失较小的泵装置形式、适当增加水泵叶轮直径和对流道型线进行充分的优化水力设计等三种途径来减少低扬程泵装置流道水力损失;简要分析了贯流泵装置的分类和三种形式半贯流式泵装置的异同点;提出了进、出水流道优化水力设计的目标和评价流道水力损失的方法;简要分析了泵装置水力性能几种研究方法的特点及相互之间的关系。面对大型低扬程泵站建设不断提高的要求,提出:在低扬程泵装置水力设计的研究方面需进一步贯彻科学发展观,提倡多元化的研究和设计理念,深入细致地做好相关的技术准备工作,对水力性能、设计、制造、运行、管理和投资等方面进行多方案、全方位的综合比较。

Based on the definition of pump efficiency and conduit efficiency, the major factors which influence the efficiency of the low head pump system were analyzed, and 3 approach routes to reduce the conduit hydraulic loss were advanced： the first is to adopt such pump system that the hydraulic loss of the conduit is lower, the second is to increase pump impeller diameter suitably and the third is to optimize hydraulic design for the conduit sufficiently. The classification of the tubular pump system was analyzed briefly as well as the similarities and differences among 3 forms of the half-tubular pump system. The objectives of the hydraulic optimum design for the inlet and outlet conduit and the method to appraise hydraulic loss of the conduit were brought forward. The characteristics of several research methods to study the hydraulic performance of pump system and the relations of between methods were also analyzed briefly. In order to satisfy the progressive requirements of large low head pum ping station, it is advanced that in the research work for hydraulic design of a low head pumping station, the Scientific Outlook on Development should be implemented seriously, the theory of variety for research and design should be promoted, relevant technological preparation work should be get ready in-depth and particularly, and comprehensive comparisons should be accomplished in the relative respects, such as hydraulic performance, design, manufacture, operation, management and investment.