Optimization and Reliability Analysis of Twisted Blades for High Speed and High Load Variable Speed Steam Turbine
In order to complete the design and application of low pressure stage twisted blade of high speed and high load industrial steam turbine,based on a ordinary twisted blade group used in steam tur-bine,the full three-dimensional aerodynamic performance of the last three stage twisted blade groups were analyzed;adaptive differential evolution algorithm was used to optimize the profile and stacking law of the last three stage blades;then,appropriate material and the structure of fir-tree blade root with loose rein-forcement were selected according to preliminary strength calculation results;finally,the finite element simulation software was used to analyze the strength vibration,dynamic stress and fatigue.The results show that the aerodynamic efficiency of the modified last three stages is improved by about 1.61%and the strength meets the requirements;in the design of the last two stages,reliability is priority,while the aerodynamic efficiency is priority for the other stages because their strength and vibration are relatively easy to solve;the final blade material may need to choose titanium alloy,and the fir-tree blade root is more reliable;the selection of the blade and loose reinforcement with large bending modulus and small thickness is beneficial to increase blade stiffness and reduce blade weight,so as to provide a reference for the design of untuned blades.
industrial steam turbineCFD analysisblade optimizationhigh speed and high loadstrength and vibrationdynamic stress
NETL
NSTL
万方数据
