Research On Cavitation Inside Water-jet Pump Through Optimize Of Aerofoil

Water-jet propulsion is a type of special ship impetus systems. It has many advantages over the others, including better cavitation performance than propeller, low noise, good protection, less adjunctive resistance, simple gearing, adaption to off-design condition, good control and position, and so on. Of the water-jet system water pump is the core component. Cavitation will cause when pump circumrotate at high speed ,and deteriorates the performance of water pump. Thus it is necessary to research on the problerm to improve the performance of pump.With the development of computational fluid dynamics and rapid improvement of computer capacity, it has been possible to research the inner flow inside water pump by numerical simulation. In the computation and analysis of water pump, numerical simulation improves reliability and reduces the cost significantly. Numerical method has become an important tool to design hydromechanical mechanism.The paper according to flow surface theory to design water-jet pump model,by changing inlet fixing angle of the rotating blade and making rotating blade to protrude forward of the pump,to improve cavitation capability of the pump. When inlet fixing angle of the rotating blade are thirty-five degree,thirty-one degree,twenty-nine degree,carrying out numerical computation at eight different Working condition.By comparison and analysis the computation results,we come to the conclusion which diminishing inlet fixing angle of the rotating blade and making rotating blade to protrude forward of the pump can improve cavitation capability of the pump effectively,The pump have high output power in fixed operating mode, the working and performance of pump are stable.Thus we obtain the results are good reference for engineers majoring on hydromechanical mechanism.