A Method for Monitoring and Identifying Water Erosion Defects of Steam Turbine Blades

Abstract

The invention discloses a water erosion defect monitoring and recognition method of a turbine blade. The method comprises the steps of sampling, modeling, and warehousing and actual operation analysis. At the step of sampling, modeling, and warehousing, experimental measurement, numerical simulation and data training are performed successively. An accelerated water erosion experiment consistent with an actual operation condition is carried out on a material to obtain a function relational expression of influences of an impact angle, an impact speed and the like on a water erosion defect feature size; on the basis of the relational expression, a blade vibration model with water erosion defects is established and a water erosion defect combination X-vibration signal oscillogram Y database isestablished; and a data set is integrated and divided, neural network training is performed, and a water erosion defect evaluation mechanism is established. At the step of actual operation analysis,a blade vibration signal oscillogram needs to be collected on site, an analysis library is compared, the set operation safety is evaluated, and a corresponding operation and maintenance scheme is formulated. According to the invention, the abnormal vibration of the blade in actual operation can be monitored in real time; the data support can be provided for the set fault diagnosis; the safe operation of the set can be guaranteed; and huge economic losses caused by blade accidents are reduced.

Description

technical field [0001] The invention belongs to the technical field of industrial equipment, and specifically relates to a method for monitoring and identifying water erosion defects of steam turbine blade materials under low-load operation. The method is based on a water erosion experiment system, a water erosion numerical simulation method, and water erosion defects established through neural network training evaluation mechanism. Background technique [0002] Steam turbine, as the indispensable main force of power generation in power plants, is the lifeblood of my country's power generation industry. With the rapid increase of steam turbine power, especially the development of ultra-supercritical and nuclear power high-power steam turbines, the use of longer final stage blades is an inevitable means to improve the efficiency of steam turbines, and the working conditions of the blades are becoming more and more severe. From the 1970s to the early 1980s, General Motors and...

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Problems solved by technology

However, due to the complexity of the water erosion problem, it is difficult to fully describe the water erosion problem with a single water erosion experiment or numerical simulation method.

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