Research Of The Internal Flow For The Inclined Guide Apparatus

Throughout the development of China’s water conservancy and hydropower utilitiessituation, the middle and low water head section of tubular turbine still have considerableroom for development. The subject of the study is mainly about tubular turbine and internalflow law of oblique guide water bodies double cascade of high head tubular turbine. Thusproviding a theoretical basis for the oblique-type water guide vane design theory andmethods.Since this tubular turbine volute section is no longer used, while the actual operationwater head is relatively high, and the runner need large circulation, so all circulation can onlybe formed by its water guide mechanism. If all the circulation is generated by guide vane, willlead the vane to overloading, seriously distorted, even flow separation and cavitationphenomenon. Because of the tapered guide vanes arranged, will inevitably lead to seriousdistortions of the airfoil which is difficult to seal water and manufacturing. So, solving theguide vanes and stay vanes that how much circulation each should form is crucial to stableoperation of the unit.Research on this topic based on fluid mechanics, hydraulic machinery flow theory,studying the movement of water within tubular turbine flow passage, establishing theoreticalmodel of flow, drawing oblique type guide water bodies double cascade flow axial flowvelocityVm R=const of the theoretical model to follow, by free vortex theory, the water indouble cascade also followsVu r=const. Thus reachVm R=const andVu r=const flow theory,and using a standard k—model completed CFD analysis of oblique guide water bodiesdouble cascade. This topic research in the same condition best positionand ring double cascade distribution. Explore the performance impact of changes in the flowfield of water bodies oblique style guide. That velocity vector and pressure distribution. Bestpositional relationship between the amount and distribution of the ring to get fixed guidevanes, guide vanes double cascade. Providing a theoretical basis for the double cascadehydraulic design.