Abstract: 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.

Key words: water-jet; contractive-flow pump; guide vane; controllable velocity moment; hydrodynamic