Method for judging pipeline self-oscillation caused by hydropower station water inlet ball valve leakage in advance

Abstract

The invention relates to a method for judging pipeline self-oscillation caused by hydropower station water inlet ball valve leakage in advance, which comprises the following steps: firstly, performingnumerical simulation on the water inlet ball valve of the hydropower station, and simulating seal upstream side pressure pulsation change within 20 seconds when the water inlet ball valve of the hydropower station leaks slightly; meanwhile, using the pressure pulsation sensor for monitoring the pressure pulsation value of the sealing upstream side of the real ball valve all the time, and comparing the measured value with the pressure pulsation value, obtained through analogue simulation, of the sealing upstream side when the ball valve leaks; if a waveform of pressure pulsation rapid oscillation expansion occurs, judging that the hydropower station water inlet ball valve leaks and causes pipeline self-excited oscillation, so that corresponding measures should be taken as soon as possible,self-excited oscillation expansion is avoided, and a destructive result is generated. The method is simple and intelligent in operation, and has a wide application prospect in monitoring the leakageof the water inlet ball valve of the hydropower station and the self-oscillation of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to the field of pre-judging the self-excited oscillation of the pipeline caused by the leakage of the water inlet ball valve of the hydropower station. Background technique [0002] In engineering projects, the hydraulic vibration in the pressure diversion pipeline is caused by the fact that the seal of the ball valve installed at the lower end of the pipeline cannot work normally, which is similar to the installation of a valve body with elastic damping effect in the pipeline. The action, which causes the hydraulic pressure in the pipeline to oscillate. If this oscillation frequency is close to the main vibration frequency or a certain resonance frequency of the piping system, large-scale resonance occurs in the piping of the water diversion system. Considering that the resonance energy comes from the water pressure change itself, this resonance phenom...

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Problems solved by technology

[0003] Chinese patent ZL.201721223477.1 relates to a ball valve leakage detection device, which is small in size and can have a long service life, but it has strict requirements on the structure of the ball valve and can only detect a single type of ball valve, and cannot judge whether it will cause pipeline leakage. self-oscillation

But it still can't judge whether it will cause self-excited oscillation of the pipeline

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