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Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine

A load pressure and water turbine technology, applied in the directions of hydropower generation, machine/engine, reaction engine, etc., can solve the problems of large pressure pulsation in hydropower stations, endangering the safety of unit operation, and inability to popularize turbines and other power stations, etc., and achieve strong pertinence. , lighten the effect of order and simple steps

Active Publication Date: 2017-03-22
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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Problems solved by technology

Affected by factors such as these, large-scale pressure fluctuations occurred in many hydropower stations, which seriously endangered the safety of unit operation
Although some turbines have reduced the pressure pulsation amplitude through the optimized design of the turbine, but because it is not clear which specific factors or changes in details have a substantial impact, their experience cannot be extended to other turbines and other power stations

Method used

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  • Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine
  • Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine
  • Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The present invention proposes a method for mitigating the hazards of high partial load pressure pulsation of a Francis turbine, which includes the optimization of the following two aspects of the turbine:

[0016] 1) Reduce the angle between the outlet edge 5 of the runner blade 2 near the upper crown 1 and the horizontal plane from the existing 10° to 25° to 8° to 20°, so as to reduce the inner side of the runner blade 2 ( close to the upper crown 1) outlet flow circulation, and then reduce the draft tube free vortex initial radius d 0 (which is image 3 The initial circulation at the horizontal distance of the pressure sharp turn on both sides shown above) can reduce the size of the vortex cavity, reduce the expansion-contraction range of the string-like vortex strands in the vortex, and reduce the high part Load pressure pulsation.

[00...

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Abstract

The invention relates to a method for relieving harms of high partial load pressure pulsation of a mixed-flow water turbine. The method comprises the following optimization in two aspects: 1) reducing an included angle between a water outlet side, close to an upper canopy, of a rotary wheel blade and the horizontal plane, and reducing water flow circulation at an outlet inside the rotary wheel blade; and 2) increasing the rotary wheel blade number to increase blade grid density, improving pressure at a water outlet side of the blade, and improving pressure distribution.

Description

technical field [0001] The invention relates to a method for alleviating the pressure pulsation hazard of high partial load of a Francis water turbine, belonging to the technical field of water turbines. Background technique [0002] In the operation of hydropower turbines, hydraulic instability problems caused by various pressure pulsations are often encountered, and the high partial load pressure pulsation of Francis turbines is one of them. "High partial load pressure pulsation" refers to the pressure pulsation that occurs within the optimum flow range of 75% to 90% of the Francis turbine. This pressure pulsation mostly occurs in Francis turbines with medium and low heads, and the pressure pulsation amplitude can reach 30% of the water head of the power station; its frequency is relatively high, usually 1 to 4 times the speed frequency (the common eccentric vortex frequency is 1 0.2 to 0.5 times); it is very sensitive to the cavitation coefficient, and often increases sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/02F03B3/12
CPCF03B3/02F03B3/121F03B3/125Y02E10/20
Inventor 徐洪泉李铁友彭忠年王万鹏廖翠林陆力赵立策易艳林王武昌范小付宫衍斌刘莎
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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