低比转速离心泵狭长叶轮流道内部流动不稳定机理研究

Low-specific-speed centrifugal pump are widely used for transporting small-flow high-head medium. Small-flow instability of low- specific-speed centrifugal pump is one of the key problems for development and application. To solve small-flow instability is to analysis the internal flow of impeller and to establish the relationship between internal flow instability and pump external characteristics. Due to small flow, rotation and curvature, the flow in narrow channel of impeller is very complex. Though many investigations for numerical simulation, experiment in centrifugal impeller are carried out, the instability mechanism is not well revealed..In this project, the methods of theoretical analysis, numerical simulation and experimental study on centrifugal pump are applied to investigate the generation and evolution mechanism of the unsteady flow structure in narrow-channel impeller of low-specific-speed centrifugal pump under the effect of geometric structure, and rotation. The mathematical model and calculation method will be established integrating effect of rotation and unsteadiness on the internal flow of centrifugal impeller. The relationship between unsteady flow structure and internal flow instability and between internal flow instability and external unstable characteristic performance will be investigated, thus the flow instability mechanics will be revealed. This will provide the theoretical support for design and development of high-performance low-specific-speed centrifugal pump.

低比转速离心泵可普遍用于对小流量高扬程介质的输送，小流量工作不稳定是影响低比转速离心泵研制和应用的关键问题之一。解决小流量不稳定问题应主要从叶轮内部流动分析着手，建立内部流动不稳定与泵外特性工作性能不稳定的关系。由于流量小再加上旋转和弯曲的作用，叶轮狭长流道内部流动极为复杂。尽管国内外已采用数值计算和实验手段对离心泵叶轮内部流动机理开展了较多的研究工作，但仍未能很好揭示不稳定机理。.本项目拟通过理论分析、数值模拟和离心泵内外特性实验研究，分析几何结构、旋转等对低比转速离心泵叶轮狭长流道内部非稳态流动结构生成和演化机制的影响，建立表征旋转和非稳态效应的离心叶轮内部流动的数学模型和计算方法，并辅以流道内部总压梯度来研究叶轮流道内部的非稳态流动结构与流动不稳定的关系以及内部流动不稳定与外特性工作不稳定的关系，从而揭示离心泵流动不稳定机理，为高性能低比转速离心泵的研制和设计应用提出理论支撑。

低比转速离心泵普遍用于对小流量高扬程介质的输送，小流量工作不稳定是影响低比转速离心泵研制和应用的关键问题之一。本项目从叶轮内部流动着手来分析小流量不稳定的问题。通过理论分析、数值模拟和离心泵内外特性实验研究，分析了几何结构、动静干涉和转速等对低比转速离心泵叶轮狭长流道内部非稳态流动结构的变化规律，建立了表征旋转的离心泵叶轮内部流动的数学模型和计算方法，辅以流道内部能量梯度方法来分析叶轮流道内部的非稳态流动与流动不稳定的关系，并通过对离心泵内前盖板及蜗壳壁面动态压力分布的测试，揭示了内部流动不稳定与外特性不稳定的关系，为高性能低比转速离心泵的研制和设计应用提供理论支撑。. 通过研究共发表论文21篇，其中SCI检索论文11篇（国际期刊6篇），EI检索论文4篇，国际会议3篇，国内会议2篇，其他1篇；培养毕业硕士研究生6名，晋升副高职称1名；承办学术会议3次。