Active regulation and control double-movable guide vane device suitable for mixed-flow water turbine

Abstract

The invention discloses a double-movable-guide-vane device capable of being actively regulated and controlled and suitable for a mixed-flow water turbine. The double-movable-guide-vane device comprises a plurality of main movable guide vanes, a plurality of auxiliary movable guide vanes and a control operation system for the main movable guide vanes and the auxiliary movable guide vanes. When the double-movable-guide-vane device operates under the deviated working condition for a long time, the opening degree of the auxiliary movable guide vanes can be reasonably adjusted in a small range, the water flow direction of an inlet of the rotating wheel is changed to be closer to impact-free inflow, and then the flowing state of water flow in the rotating wheel is improved; meanwhile, flow instability such as flow separation and flow separation generated by the movable guide vane can be reduced to a certain extent, the generation probability of blade channel vortexes and Karman vortexes is reduced, the occurrence probability of pressure pulsation and cavitation is reduced to a certain extent, and the purposes of improving the operation efficiency of the deviated working condition and the operation safety and stability of the unit under the deviated working condition are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic machinery auxiliary equipment, and in particular relates to an active controllable double movable guide vane device suitable for a Francis turbine. Background technique [0002] With the continuous growth of my country's energy demand and the deteriorating environment, the development of clean energy power generation has become an inevitable trend. Compared with wind power, photovoltaic power generation, nuclear power and other clean energy power generation, the proportion of hydropower generation is higher. In addition, hydropower can flexibly and quickly carry out peak regulation, frequency regulation, energy regulation and energy storage, which ensures the safety and stability of power grid operation and the recovery and utilization of waste electric energy. Hydropower uses the potential energy and kinetic energy of the water flow to drive the turbine to rotate to convert the water energy into...

AI Technical Summary

Problems solved by technology

In addition, the shedding on the surface of the guide vane will form a wake at the tail of the guide vane, which will cause blade path vortices and large pressure fluctuations under certain working conditions, causing vibration and cracks in the runner blades. Under certain working conditions, Karman vortices arranged crosswise at the tail of the movable guide vane will cause excitation and cracks to the guide vane, resulting in greater pressure pulsation and flow instability to the flow field

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