Circulating improved water turbine cavitation erosion initial state discrimination system and method

Abstract

The invention relates to a circulating improved water turbine cavitation erosion initial state discrimination system and method, and belongs to the field of a water turbine cavitation erosion initial state. The system comprises an in-situ measurement layer, a signal preprocessing layer and a data processing and analysis layer. Cavitation characteristic values are extracted by applying a data fusion technology and an acoustic emission detection technology, and important auxiliary variables such as unit top cover vibration, water pressure pulsation, a water head, a downstream water level, a large-shaft air supply amount and other working condition data are fused to establish a circulating improved cavitation erosion initial state discrimination model, and realize cavitation state identification and cavitation erosion working condition prediction of a water turbine. A situation that runner blades are damaged and forced to rotate for maintenance due to the long-term cavitation erosion working condition of a water turbine set is reduced, the healthy operation level of the water turbine set is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a discrimination system, in particular to a cycle-improved water turbine cavitation primary state discrimination system, which belongs to the field of hydraulic turbine cavitation primary. Background technique [0002] In recent years, with the construction of large-scale water conservancy projects and the successive completion and commissioning of large and medium-sized hydropower stations, the proportion of hydropower in the entire power grid is increasing, and the safety, stability, and economical problems of hydro turbine operation have become increasingly prominent. [0003] For hydro turbines, cavitation cavitation has always been a difficult and common problem in the industry, which has a very bad impact on the safe operation and efficiency of hydro turbines. First, due to cavitation, the overhaul of many large and medium-sized turbines was forced to be changed from 5-10 years to 2-3 years, and the maintenance cost was r...

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Problems solved by technology

[0003]For hydro turbines, cavitation cavitation has always been a difficult and common problem in the industry, which has a very bad impact on the safe operation and efficiency of hydro turbines

First, due to cavitation, the overhaul of many large and medium-sized turbines was forced to be changed from 5-10 years to 2-3 years, and the maintenance cost was relatively high, which brought huge economic losses to the power station

Second, the damage to the flow-passing parts of the turbine has affected the safe and stable operation of the unit: a large amount of dirt and sediment is carried in the water flow during the flood season. Th

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