A method for alleviating pressure pulsation damage caused by gap cavitation in tubular turbines
A tubular water turbine and interstitial cavitation technology, applied in the field of hydraulic machinery, can solve problems such as jeopardizing the safety of power stations, severe vibration of units and plant structures, and achieve the effect of reducing the harm of strong vibration and resonance.
Active Publication Date: 2020-10-09
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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Problems solved by technology
The pressure pulsation causes severe vibration of the unit and plant structure, which endangers the safety of the power station.
Method used
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0022] The present invention provides a method for alleviating pressure pulsation damage caused by gap cavitation of a tubular water turbine, which comprises the following steps:
[0023] 1) Optimize the number of guide vanes Z g and the number of runner blades Z r , adjust the guide vane number Z g with blade number Z r The ratio of is not equal to an integer, that is, the number of guide vanes Z g and the number of runner blades Z r There is a non-integer multiple relationship between them.
[0024] Because if the guide vane number Z g Exactly equal to the number of runner blades Z r Integer multiples of , the pressure pulsation formed by cavitation in the guide vane gap may form a very uniform periodic waveform on the high pressure side of the runner;
[0025] Assumed rated speed frequency f n Equal to 1Hz, the number of runner blades Z r...
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The invention discloses a method for relieving pressure pulsation hazards caused by cavitation of a tubular water turbine. The method is characterized by comprising the following steps of 1), enablingguide vane number Zg and rotating wheel vane number Zr in a non-integer multiple relation when the guide vane number Zg and rotating wheel blades number Zr of the tubular water turbine are selected;2), optimizing design of a rotating wheel chamber and a tail water pipe connected with the rotating wheel chamber into a whole; and 3), optimizing design of components of a high-pressure side unit ofa rotating wheel and the structure of a factory building. According to the method, through the composition selection of the rotating wheel blades number and the guide vanes number, anti-resonance design of the rotating wheel chamber and structural parts at the rotating wheel high-pressure side, strong vibration and resonance hazards caused by gap cavitation of the tubular water turbine are effectively reduced.
Description
technical field [0001] The invention relates to a method for alleviating pressure pulsation damage caused by gap cavitation of a tubular water turbine, belonging to the technical field of hydraulic machinery. Background technique [0002] In the past decade or so, due to difficulties such as high mountains and deep valleys, far away from power load areas, and increased immigration difficulties, the development of low-head hydropower stations has entered a peak period, and a large number of tubular hydropower stations have been built. Generally speaking, these tubular hydropower stations are running well, playing a very good role, and the operation is relatively stable. However, many problems have also been found. The main problem is that some power stations have large pressure fluctuations and severe vibrations at low water heads, making them unable to generate electricity normally. Although some power stations can operate, the runner chamber is torn due to severe vibration...
Claims
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IPC IPC(8): F03B3/00F03B3/14F03B3/16F03B11/04E02B9/00
CPCY02E10/20
Inventor 徐洪泉何成连李铁友张弋扬孟龙陆力廖翠林张海平何磊王万鹏赵立策王武昌
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES