舰船燃气涡轮叶片三维热流固耦合应力应变分析及寿命预测

为提高燃气轮机的可靠性、可用性以及可维护性而进行的寿命预估与减损控制研究,需要对燃气轮机的关键零部件进行结构特性分析。对舰船燃气轮机涡轮叶片在紧急升工况载荷谱下的应力应变状态进行了三维热流固耦合有限元分析,针对典型载荷谱计算了涡轮叶片应力应变的变化规律,对涡轮叶片材料进行了控制应变试验,为叶片寿命预测提供了必要的参数。根据应力应变分析结果利用Basquin公式和Manson-Coffin公式计算了2个危险点处的疲劳裂纹起始寿命。并根据分析结果对涡轮叶片进行了寿命预测,预测结果可以作为燃气轮机使用维修的参考依据。

Analysis and Life Cycle Prediction of Marine Gas Turbine Blades Based on Thermal-Fluid-Structure Interaction

Investigating the damage reduction control and the life cycle prediction of blade for purpose of improving the reliability,usability and maintainability of marine gas turbine need to analyze the structure performance of key components.Finite Element Method was used to carry out the three-dimensional analysis of thermal-fluid-structure interaction with regard to different stress and strain under emergent loading conditions.Experiment was performed to control the material strain of turbine blade,which would make inputs available for life cycle prediction,followed by stress and strain computation in typical loading spectrum.The results were used for computing the life cycle of fatigue cracks at two hazardous points by Basquin Equation and Manson-Coffin Equation.Analysis results can be utilized to predict the blades＇ life cycle and thus provide reference for the operation and maintenance of gas turbine.