不同负荷下汽轮机末级叶片疲劳寿命研究  

Fatigue Life of Turbine Final Blade Under Different Loads

作　　者：赵帅 潘宏刚 张野 杨嘉森 ZHAO Shuai;PAN Honggang;ZHANG Ye;YANG Jiasen(School of Energy and Power,Shenyang Institute of Engineering,Shenyang 110136;Branch of Courts of Shenyang,China Guodian Science and Technology Research Institute,Shenyang 110102,Liaoning Province)

机构地区：[1]沈阳工程学院能源与动力学院,辽宁沈阳110136 [2]中国国电科学技术研究院沈阳分院,辽宁沈阳110102

出　　处：《沈阳工程学院学报（自然科学版）》2024年第3期27-31,共5页Journal of Shenyang Institute of Engineering:Natural Science

摘　　要：新能源发电技术受气候影响,导致其发电量不稳定,需要火电厂配合调整发电量,造成火电机组时常深度调峰运行。深度调峰运行方式对机组有很大影响,使末级叶片的运行环境变得更加复杂,尤其是末级流场情况的改变对叶片寿命的影响非常大。因此,为了研究在深度调峰运行方式下末级流场情况的改变对末级叶片疲劳寿命的影响,以某火电机组低压缸50%叶高处的末级叶片为研究对象,采用数值模拟的方法,对比了汽轮机分别在100%THA、50%THA、20%THA工况下运行时低压缸末级叶片的疲劳寿命。结果表明:随着汽轮机组负荷降低,叶片的疲劳寿命也随之减小。With the introduction of policies such as carbon peaking and carbon neutrality,hydropower,wind power and photovoltaic power generation have developed rapidly.However,due to the influence of climate,the power generation of new energy generation is unstable,which requires the coordination of thermal power plants to adjust the power generation,resulting in deep peak adjustment operation of thermal power units.However,depth peak-regulating operation has a great influence on unit operation,and the operation environment of final stage blades becomes more complex.In particular,the change of final stage flow field has a great influence on blade life.In order to study the influence of changes in the final stage flow field caused by deep peak-regulating operation on the fatigue life of the final stage blades of a steam turbine,this paper takes the final stage blades at the top of 50%blades of the low pressure cylinder of a thermal power unit as the research object,and adopts the numerical simulation method for turbine operation under different working conditions.The fatigue life of the final stage blade of the low pressure cylinder of the steam turbine was studied and compared under three working conditions of 100%THA,50%THA and 20%THA respectively.It is concluded that the fatigue life of turbine blades decreases with the reduction of turbine load.

关 键 词：汽轮机 末级叶片 深度调峰 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]