Residual life prediction of flue gas turbine blade with defects at high temperatures
Flue gas turbine is an important equipment to recycle and utilize the high temperature flue gas energy.The impact of catalyst and other particles in flue gases is easy to result in the defects such as the thickness thinning and cracks on the blade,which can seriously affect the service life of the turbine blade.The creep crack growth and residual life of the flue gas turbine blade with defects were investigated by using the finite element method.The results show that the effect of the initial crack on creep life of the turbine blade is much greater than that of the blade thickness thinning.When the initial crack length is about 2 mm,it does not affect the residual life of the blade too much.When the initial crack is about 5 mm,the residual life when the defect is located at the blade root decreases by 40%,but that when the defect is 1/3 of the blade away from the blade root only decreases by around 10%.When the initial crack length is longer than 10 mm,the residual lives of the turbine blade with the above mentioned two defects both decrease significantly,and the effect when the initial defect is 1/3 of the blade away from the blade root on the residual life of the blade is greater than that when the defect is at the blade root.
flue gas turbine bladedefectshigh temperature creepresidual life prediction
万方数据
维普
