7.A mixed-flow pump with unshrouded impeller was manufactured, and the flow in the impeller at design and off-design flow rates was measured by particle image velocimetry (PIV).

• 为探讨混流式叶轮内部的流动机理,设计了一半开式叶轮混流泵实验装置,利用PIV技术对设计流量及变流量工况下叶轮内部的流动进行了测量。