Study on Service Life of Last Stage Blade with Damped Structure inLarge Power Steam Turbine
(0) Blade which transfers thermal energy of steam into power,is a basic component in steamturbine.The reliability of blade is heavily influenced by the operating environment.The rotating bladeexperiences large inertial load and the wake of nozzle flow impose large variations of aerodynamicload on blade,in addition,the last stage blade is also affected by corrosion,so accidents of bladehappen from time to time.Preventing blade failure has become one of the major objectives of turbinedesign and in-service maintenance.It is said that the reason for most of blade failure is fatiguefracture.In this study,a synthetical numerical model has been developed to evaluate service life ofblade.At first,a numerical model to analyze the excitation force,dynamic frequency and dynamicstress of steam turbine blade has been developed,based on the results of dynamic stress analysis,amodel to evaluate the service life of turbine blade has been developed.Many factors such asmanufacturing technology of blade and erosion operating environment are considered to get moreaccurate results for service life of blade.At last,a last stage blade group of a large power steam turbineis analyzed in detail.It is shown clearly that the numerical model can give some rational quantitativeresults,and it is suitable for its engineering application to the improvement of the blade reliability.
Blade Fatigue Service life Steam turbine Numerical analysis
D.Zhang Y.H.Xie
School of Energy and Power Engineering,Xian Jiaotong University,Xian,Shaanxi,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）