An intelligent optimization method for the fixed guide vane profile of a hydraulic turbine

Abstract

The invention discloses an intelligent optimization method for the fixed guide vane of a water turbine, comprising: establishing a parametric geometric model of the fixed guide vane according to the blade shape parameters of the original fixed guide vane of the water turbine; establishing a fixed guide vane based on the parameterized geometric model of the fixed guide vane. The three-dimensional CFD flow field simulation model of the guide vane, and then conduct CFD simulation calculations for fixed guide vanes of different blade shapes to obtain the influence of each blade shape parameter on the flow field characteristics; use the influence of each blade shape parameter on the flow field characteristics to establish training samples Set, use the method of extreme learning machine to fit the neural network, and get the corresponding relationship between leaf shape parameters and performance indicators; according to the corresponding relationship between leaf shape parameters and performance indicators, establish an objective function, use the objective function combined with genetic algorithm in the neural network The blade shape parameters are optimized to obtain the optimal blade shape parameters. The intelligent optimization method of the invention can effectively improve the performance of the fixed guide vane of the water turbine according to actual engineering requirements, and reduce design time and design cost.

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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