某型航空发动机整体叶盘强度分析

摘要

In order to reduce weight of the turbine′s blisk and raise the thrust-weight ratio of aero-engine, 3-dimensional models for two different structures with solid and hollow section were built in UG by using the lighter criteria optimization. The models were connected to the FEM software, and then the comprehensive investigation and analysis of the stress were carried on under the coupled action of the centrifugal load and temperature load on the basis of the constraint characteristics of blisk. Thus the corresponding stress contours and stress-radius curve were obtained to determine the area of the maximum stress and the characteristics of stress distribution. The rationality of blisk′s strength for the two structures with different cross section was verified, so as to indicate the superior performance of the hollow blisk which has a great potential for improving the thrust-weight ratio of aero-engine. The calculation results provide a basis for the structural design and fatigue life prediction.%为减轻涡轮盘质量，提高航空发动机的推重比，以某型整体叶盘作为研究对象，在UG中建立了整体叶盘实心断面和按质量更轻准则优化后的空心断面两种不同结构的三维模型，导入有限元分析软件，并根据叶盘的约束特点，对两种结构叶盘在离心载荷和温度载荷耦合作用下的应力进行了综合考察与分析，获得了相应的应力分布云图和应力-半径变化曲线，确定了应力最大区域的位置和应力分布的特点，验证了两种不同断面结构叶盘强度的合理性，表明了空心叶盘结构性能更为优越，在提高发动机推重比方面潜力巨大。计算结果为整体叶盘结构设计和疲劳寿命预测提供了依据。