Intelligent optimization method for vane profiles of fixed guide vanes of water turbine

Abstract

The invention discloses an intelligent optimization method for vane profiles of fixed guide vanes of a water turbine. The method comprises the steps of building a parametric geometric model of the fixed guide vanes according to vane profile parameters of the fixed guide vanes of the original water turbine; building a three-dimensional CFD flow field simulation model of the fixed guide vanes on thebasis of the parametric geometric model of the fixed guide vanes, and then performing CFD simulation calculation on the fixed guide vanes of different vane profiles, thereby obtaining the influence of the vane profile parameters on flow field characteristics; establishing a training sample set by utilizing the influence of the vane profile parameters on the flow field characteristics, and fittinga neural network by adopting a method of an extreme learning machine, thereby obtaining corresponding relationships between the vane profile parameters and performance indexes; and according to the corresponding relationships between the vane profile parameters and the performance indexes, establishing an objective function, and optimizing the vane profile parameters in the neural network in combination with a genetic algorithm by utilizing the objective function, thereby obtaining optimal vane profile parameters. According to the intelligent optimization method, the performance of the fixedguide vanes of the water turbine can be effectively improved according to actual engineering requirements, the design time is shortened, and the design cost is reduced.

Description

technical field [0001] The invention belongs to the field of optimized design of fixed guide vanes of hydraulic turbines, and more specifically relates to an intelligent optimization method for fixed guide vanes of hydraulic turbines. Background technique [0002] During the operation of large hydraulic turbines, hydraulic factors are one of the main causes of vibration of hydroelectric generating units. Hydraulic factors are usually divided into three types: low-frequency pressure fluctuations in the draft tube under partial load; pressure fluctuations caused by blade path vortices in the runner when the operating conditions deviate from optimal conditions; High-frequency pressure pulsation at the tip of guide vanes and runner blades. Among them, the periodic force of the Karman vortex on the object will cause periodic vibration, especially when the vortex shedding frequency is close to the natural frequency of the blade, this vibration will cause resonance, resulting in m...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an intelligent optimization method for the fixed guide vane of the water turbine, thereby solving the problem of resonance of the fixed guide vane in the prior art, short fatigue life, and large energy loss. The technical problems of poor safety and stability and low hydraulic efficiency of hydroelectric generator sets

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