The Geometric Parameters Of Guide Vane Inlfuence On The Performance Of The Diving Pump

As the commonly used fluid machinery, the diving pump widely used in industry, agriculture and life, but the efficiency is not high enough recently in the marketplace. So it is necessary for us to research and develop high performance dividing pump. Besides impeller, the performance research to guide vane has certain application value in design and production. Through improving geometric parameter of guide vane can design the high-class diving pump, which is more suited for market application.In this subject, guide vane of diving pump was studied as the research object by hydraulic designing of its whole flow fields and flow components of the three-dimensional modeling and CFD numerical simulation. The numeric area of geometric parameter and performance was predicted and analysised. The main work and research results obtained are as follows:First, deducing the equations of guide vane and impeller in theory, at the same time, and pointed out the influence on guide vane performance curve of changed inlet geometric parameter, such as blade number'Z', inlet axial width'4'of guide vane and the blade fixing angle of inlet'a3'. We have obtained the theory solution about best efficiency point.Second, taking advantage of k-ε model and SIMPLE algorithm of fluent software to carry out numerical calculation estimate under different flow operation conditions for diving pumps'internal three-dimensional incompressible turbulent flow fields. Predicted the performance of guide vane through analysing velocity fields of pressure fields of different guide vane cases under different inlet geometry parameters.Third, having obtained the diving pump performance curves through numerical calculating the diving pumps which different inlet geometry parameters guide vane are matched the same impeller. And calculated the internal diversion energy loss for the different guide vane cases according to total pressure average quantity change curves of different Zsections along the axial direction,which can unveil the influence rules for diving pump on blade number 'Z', inlet axial width 'b3' of guide vane and the blade fixing angle of inlet 'α3' of guide wane.Forth, error analysing the best efficiency points which using analysis calculation method and simulation testing method. Prove the results are anastomotic. So this two methods are correct and meaningful. Last,Calculating the ratio of area of diving pump which different inlet geometry parameters guide vane are matched the same impeller by the theoretical calculation and measurement methods, getting the best ratio of area scope is from0.84to0.86by combining the influence rules for diving pump on guide vane inlet geometric parameter. Then we can obtain another high efficiency pump on basis of the ratio of area and influence rules when keeping impeller is constant. The new diving pump(II) single head and highest efficiency add0.9m and1.96%compared with original pump(I). It is proved that research this subject is valuable.The research about the performance of guide vane and the function of pump by CFD simulation can master interior flow pattern,and judge the design parameters are reasonable or not;at the same time, it can shorten the research time,decrease costs and have more scientific research and economic significance.