为解决新型喷水推进收缩流泵因径向尺度小、导叶动负荷大引起的水动力问题，提出一种用于喷水推进收缩流泵导叶水动力设计的三元可控速度矩方法.基于收缩流式叶轮，通过控制过流面积变化优化导叶子午面，实现从泵进口到出口的全收缩.根据可控速度矩原理，针对叶轮出口流场与收缩流式导叶特点给定子午面速度矩分布，完成了导叶片三元可控速度矩设计，建立了收缩流式导叶模型.应用经过试验验证的推进泵数值模拟试验方法进行推进泵内流场与外特性计算分析.结果表明，设计工况点处推进泵模型效率由原设计的87%提升至90%，导叶轴向长度缩短了20%.设计优化效果显著，能够满足工程应用要求，从而解决了水动力问题.
To solve the hydrodynamic problem of a new type of water-jet contractive-flow pump caused by the smaller radial dimension and higher load on guide vane, a hydrodynamic design method of the three-dimensional controllable velocity moment for water-jet contractive-flow pump guide vane is proposed. A guide vane meridian plane is optimized by controlling the flow area change based on a contractive-flow impeller, and the overall contraction from pump inlet to outlet is realized. Based on the principle of controllable velocity moment, the velocity moment distribution on meridian plane is given according to the outlet flow field of an impeller and the characteristics of contractive-flow guide vane. The design of guide vane is accomplished by a three-dimensional controllable velocity moment method and the model of the guide vane is formed. The internal flow field and external characteristics of the contractive-flow pump are calculated by applying a numerical simulation test method which has been verified. The numerical simulation result shows that the pump efficiency increases from 87% in the original design model to 90%. The axial length of the guide vane is shortened by 20%. The design and the optimization effects are remarkable, and the improved design can meet the requirement of engineering application.The hydrodynamic problem is solved.
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