On-line evaluation method of turbine cavitation state based on fast envelope spectral kurtosis

A technology of cavitation state and evaluation method, applied in the direction of processing detection response signals, instruments, measuring devices, etc., can solve problems such as blade perforation, threat to safe operation of unit, and edge drop

Active Publication Date: 2022-07-05
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

When the water flows through the surface of the flow parts, cavitation will occur locally and then slight cavitation will form, which will form honeycomb cavitation, and even develop to the perforation or edge loss of the blades, which will seriously threaten the safe operation of the unit

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  • On-line evaluation method of turbine cavitation state based on fast envelope spectral kurtosis
  • On-line evaluation method of turbine cavitation state based on fast envelope spectral kurtosis
  • On-line evaluation method of turbine cavitation state based on fast envelope spectral kurtosis

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Embodiment Construction

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] Please refer to figure 1 , the present invention provides an on-line evaluation method for the cavitation state of a hydraulic turbine based on the fast envelope spectral kurtosis, comprising the following steps:

[0047] Step S1: Ultrasonic cavitation signal measured by a broadband ultrasonic sensor installed on the water turbine; the original cavitation signal is a complex signal containing multiple frequency components, and it is almost difficult to identify the shock pulse directly by using the original cavitation signal. signal. image 3 It is a raw cavitation sound signal, and the transient shock signal mixed in various frequency components is almost difficult to detect.

[0048] Step S2: calculate the optimal bandpass filter according to the fast envelope spectral kurtosis;

[0049] Step S3: According to the original cavitation signal, ad...

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Abstract

The invention relates to an on-line evaluation method for the cavitation state of a hydraulic turbine based on the fast envelope spectral kurtosis, comprising the following steps: step S1: collecting the original cavitation signal of the water turbine; step S2: calculating the optimal zone according to the fast envelope spectral kurtosis pass filter; Step S3: adopt the optimal band-pass filter to carry out band-pass filtering to obtain the shock pulse signal waveform; Step S4: adopt digital envelope demodulation to solve the shock pulse envelope waveform; Step S5: pass the envelope signal Identify the number of shock pulses that can be obtained, the time width of each shock pulse and the magnitude of the pulse amplitude; Step S6: integrally calculate the cumulative pulse shock energy per unit time and count the shock pulse density per unit time; Step S7: according to the cumulative pulse shock per unit time The energy and statistical impulse density per unit time are used to obtain the evaluation of the cavitation state of the turbine. The invention utilizes the density of the impact pulse and the impact energy intensity to realize the online evaluation of the development degree of the cavitation of the runner.

Description

technical field [0001] The invention relates to the field of hydro-turbine cavitation state evaluation, in particular to an on-line evaluation method of hydro-turbine cavitation state based on fast envelope spectrum kurtosis. Background technique [0002] The hydro turbine is the key energy conversion unit in the hydroelectric generating unit, and its working condition will directly affect the running condition of the entire hydroelectric generating unit. For hydraulic turbines, cavitation erosion is an inevitable damage phenomenon. When the water flows through the surface of the flow components, local cavitation will occur and then slight cavitation will occur, which will then form honeycomb cavitation, and even develop to the perforation or edge drop of the blade, which will seriously threaten the safe operation of the unit. Cavitation cavitation is one of the main factors that lead to the decrease of the operating efficiency of the turbine, the damage to the structure an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/46G01N29/44G01N29/04
CPCG01N29/46G01N29/4409G01N29/04G01N2291/2693
Inventor 林家洋魏运水王昕王利霞陈学仁张民威苏疆东何继全刘艺李震
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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