Structure Strength Analysis Of Impeller And Guide Vane Chamber Of Mixed Flow Waterjet Pump

In recent years, many powerful navy countries in the world are continuously enlarging the technical research of waterjet. Waterjet unit is applied widely and succefully in high-speed warships, stealth warships, high speed support and supply ships,mine warfare and antisubmarine ships ,landing ships by their navy.The larger ,higher efficient and lighter waterjet unit,it inclines to, from medium small scaled. Mixed-flow type is the developing trend of high-power waterjet unit. Impeller and guide vane chamber are the core parts of the whole unit,which directly relates to the efficiency, safety, credibility and cost of the equipments. Currently,such standards or rules of strength analysis and evaluation method for impeller and guide vane chamber of mixed-flow waterjet pump are deficient in China.Taking KaMeWa 71 SII waterjet unit as research object,the thesis firstly analyzes loads of two boundary working situations—absorbing power 2240 kW and 7000 kW,secondly ,checks the structure strength by the industry pump method and rules of high speed and light boat of DNV classifycation,approaches the methods from merits and disadvantages.Then , adopts CFD to analyze the pressure of the blade surface,puts forward the way of FEM method to check the structure strength loading the pressure.The calculating results enunciate that the structure strength of this kind of impeller and guide vane chamber can satisfly the working request and match the application results on the ship.At last,optimizes the structure design of guide vane chamber according to FEM analysis results.Ship tests prove that the optimization design is reasonable , and beneficial to raise the working efficiency.