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Mixed flow water turbine with an eddy suppressor

A water turbine and mixed-flow technology, applied in the field of fluid machinery and engineering equipment, can solve the problems of unit vibration, large shaft periodic swing, output swing, and water flow pressure pulsation and loss in pipelines, and achieve simple structure, low processing cost, The effect of increasing the central flow velocity

Inactive Publication Date: 2005-11-30
TSINGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

When the unit is under partial load conditions, the vortex swivels in the draft tube in a helical shape, forming low-frequency vortex pulsation, and the vortex pulsation pressure is transmitted to each flow-passing component, which can cause unit vibration, periodic oscillation of the main shaft, output swing and Pressure pulsation of water flow in the pipeline, etc. Many large hydraulic units at home and abroad have caused huge losses due to strong pressure pulsation caused by the draft tube vortex

Method used

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  • Mixed flow water turbine with an eddy suppressor
  • Mixed flow water turbine with an eddy suppressor
  • Mixed flow water turbine with an eddy suppressor

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Embodiment Construction

[0014] The principle and structure of the present invention will be further described below in conjunction with the accompanying drawings.

[0015] figure 1 It is a schematic structural diagram of a Francis turbine with a vortex suppression device provided by the present invention. According to the water flow direction, it includes volute 1, movable guide vane 2, fixed guide vane 3, runner 5, draft tube 7 installed at the lower part of the runner, and vortex suppression device 6; the vortex suppression device is arranged between the draft tube and the runner It is fixed on the bottom of the runner body by bolts. The vortex suppression device 6 adopts an axial-flow blade structure, and the installation angle of the inlet of the axial-flow blade 8 is the same as that of the runner blade 4; the wrap angle of the axial-flow blade 8 is 150-180 degrees, and the length is about 0.5-1.0 times the diameter. Generally, 4 to 8 axial flow blades are suitable, and their steering is the ...

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Abstract

This invention relates to a mixed flow turbine with eddy confinement device, characterized in that it sets an eddy confinement device applying axial-flow foliated structure between draft-tube and rotary wheel, and rotates with the wheel of the turbine; the inlet setting angles of axial-flow foliated and rotor blade are same; the blade wrap angle is 150~180 deg, and the length is 0.5-1.0 times of inlet diameter of the wheel. Said invention improves the flowing condition of wheel outlet, enhancing central current rate of draft-tube, decreasing pressure fluctuation of draft-tube, so it can improve operation stability of mixed flow turbine, meanwhile, it meets the stability requirement of both high volume behavior and small flow behavior.

Description

technical field [0001] The invention relates to a Francis water turbine, in particular to a Francis water turbine with a vortex suppression device, which belongs to the technical field of fluid machinery and engineering equipment. Background technique [0002] The Francis turbine is currently the most widely used water turbine. The water flows radially into the runner blades, pushes the runner to do work, and changes the flow direction to flow out axially. Francis turbines are generally suitable for water heads ranging from 50 to 700 meters, and outputs ranging from tens of thousands of kilowatts to several million kilowatts. [0003] The Francis turbine is a fixed blade turbine, and the blades are fixed between the upper crown and the lower ring. When the Francis turbine operates in a deviation from the design condition, there will be no impact at the blade inlet of the runner, and the blade outlet will form an outlet with a ring. A vortex belt is generated in the draft tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/12
CPCY02E10/223Y02E10/20
Inventor 张梁刘树红吴玉林
Owner TSINGHUA UNIV
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