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A draft tube and method for reducing water pressure pulsation and pressure gradient of a turbine

A water pressure pulsation and pressure gradient technology, which is applied in the fields of hydropower generation, machinery/engine, mechanical equipment, etc., can solve the problems of the stability of the operation of hydropower units, pressure pulsation, etc., to suppress the vortex movement, balance the flow, improve the water The effect of pressure pulsation

Active Publication Date: 2021-06-08
TSINGHUA UNIV
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Problems solved by technology

[0002] The vortex belt of the draft tube of the hydraulic turbine is a special vortex motion, especially when the hydraulic turbine operates in a working condition that deviates from the design flow, it will cause strong pressure fluctuations, which will easily lead to operational stability problems of the hydropower unit

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  • A draft tube and method for reducing water pressure pulsation and pressure gradient of a turbine
  • A draft tube and method for reducing water pressure pulsation and pressure gradient of a turbine
  • A draft tube and method for reducing water pressure pulsation and pressure gradient of a turbine

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Embodiment Construction

[0020] The principle, structure and working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] figure 1 The structure schematic diagram (main sectional view) of the draft tube of the water turbine with the fin-like structure provided for the present invention, the draft tube of the water turbine includes the straight cone section 2 of the draft tube, the elbow section 4 of the draft tube, the diffuser section 17 of the draft tube and the outlet of the draft tube 5. The draft tube also includes a fin-shaped structure 7, which is arranged in close proximity to the side wall of the straight cone section 2 of the draft tube along the circumferential direction. Let the diameter of the inlet circle 1 of the straight cone section be D d , the vertical distance between the x-direction symmetrical centerline 3 of the fin-like structure and the inlet circle 1 of the straight cone section is h d , the ratio of the t...

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Abstract

A draft tube and its method for reducing water pressure pulsation and pressure gradient of a hydraulic turbine. The draft tube is provided with a fin-shaped structure on the side wall of the straight cone section. A pressurized fluid is introduced inside to equalize the pressure distribution. When the water pressure pulsation in the turbine is small, the amplitude and pressure gradient of the water pressure pulsation in the draft tube are reduced by the fin structure; when the water pressure pulsation in the water turbine exceeds the allowable value, pressurized fluid is introduced through the inlet, Significantly reduce the water pressure pulsation and pressure gradient in the draft tube. The fin-shaped structure of the present invention is small in size, not easily damaged under the action of water flow, and does not affect the hydraulic performance of the water turbine, can balance the pressure distribution in the draft tube, effectively suppress the strong water pressure pulsation in the draft tube, and thereby improve the operation stability of the water turbine , to expand the safe operation range and working condition adjustment capability of the turbine. In addition, the method helps to improve the survival rate of fish passing through the turbine, which is suitable for fish-friendly turbines.

Description

technical field [0001] The invention relates to a hydraulic turbine draft tube, in particular to a hydraulic turbine draft tube with strong water pressure pulsation, which is suitable for improving the pressure pulsation in the draft tube of a hydropower station when the hydraulic turbine operates off the design condition, and can improve the survival rate of fish passing through the hydraulic turbine. Background technique [0002] The vortex belt of the draft tube of the hydraulic turbine is a special vortex motion, especially when the hydraulic turbine operates at a working condition that deviates from the design flow rate, it will cause strong pressure fluctuations, which will easily lead to operational stability problems of the hydropower unit. In order to alleviate the hydraulic pressure fluctuation caused by the vortex in the draft tube of the hydraulic turbine, some necessary measures can be taken in engineering. Currently commonly used engineering measures mainly inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/18F03B11/04
CPCF03B3/18F03B11/04Y02E10/20
Inventor 罗先武杨丹丹王琳许洪元
Owner TSINGHUA UNIV
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