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A method for alleviating the pressure pulsation hazard in the vaneless area of ​​a Francis pump turbine

A water pump turbine, pressure pulsation technology, applied in hydropower, machines/engines, reaction engines, etc., can solve the problems of lack of understanding, less attention to pressure pulsation, unclear source and transmission mode, etc., to achieve operability Strong performance, simple and clear design method and steps, and the effect of reducing pressure fluctuations in the bladeless area

Active Publication Date: 2020-07-24
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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Problems solved by technology

[0004] However, since a large number of stability problems encountered in conventional hydropower stations mostly occur in the draft tube, vortex belt pressure fluctuations are the main source of hazards, less attention has been paid to the pressure fluctuations occurring in the vaneless area between the movable guide vane and the runner, and little is known about it. In-depth, even less clear about its source and mode of propagation, and little is known about the dynamic and static interference between the rotating runner blade and the stationary movable guide vane, so it is difficult to propose effective mitigation measures

Method used

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  • A method for alleviating the pressure pulsation hazard in the vaneless area of ​​a Francis pump turbine

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Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0011] The present invention proposes a method for alleviating the pressure pulsation hazard in the bladeless zone of the pump turbine, which includes the optimization of the following two aspects of the pump turbine:

[0012] 1) if figure 1 As shown, the blade 3 on the high-pressure side of the runner of the Francis pump turbine (the water inlet side under the turbine working condition, and the water outlet side under the water pump working condition) is arranged obliquely, so that the included angle Φ between the water inlet side bone line 4 of the blade 3 and the axial direction is not less than 15° , its technical effect is to disperse the shedding vortex at the water inlet edge of turbine blades at different heights at different radial angles, so as to disperse the dynamic force of the shedding vortex on the top cover, so that each height layer i...

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Abstract

The invention relates to a method for reducing the pressure pulsation hazard of a blade-free region of a mixed-flow pump turbine. The method is characterized by comprising the optimization of the flowing two aspects for the mixed-flow type pump turbine: 1) blades of the high-pressure side of a runner of the mixed-flow type pump turbine are obliquely arranged so that the included angle phi between a center line of the water inlet edge of each blade and the axis direction is not less than 15 degrees; and 2) 2 -3 blades are additionally arranged on the basis that the requirements for the rigidity and the intensity of the runner and the runner blades of the flow-mixed type pump turbine are met so that the distance between blade channels of the high-pressure side of the runner can be decreased so as to reduce the development space of flow-separated vortexes.

Description

technical field [0001] The invention relates to a method for alleviating the pressure pulsation hazard in the vaneless area of ​​a mixed-flow water pump turbine, which belongs to the technical field of hydraulic machinery and pumped storage. Background technique [0002] In the operation of pump turbines in pumped storage power stations, hydraulic instability problems caused by various pressure fluctuations are often encountered. "Pressure fluctuations in the bladeless area" is one of them, which is much more serious than conventional turbines. The so-called "pressure pulsation in the bladeless zone" refers to the pressure pulsation that occurs between the movable guide vane and the runner. Severe unit vibration and plant vibration. [0003] Modern large-scale pumped-storage power stations mostly use reversible mixed-flow pump-turbines that pump water and generate electricity at the same time. They can either operate under pump conditions when pumping water, or operate unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/12F03B13/06
CPCF03B3/121F03B13/06Y02E10/20Y02E60/16
Inventor 徐洪泉潘罗平于纪幸安学利高忠信廖翠林周叶陆力李铁友王万鹏饶蕾
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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