涡轮叶尖间隙计算实现方法与结果分析

叶尖间隙分析是研究叶尖问隙控制方法，改善发动机性能的重要内容。本文应用有限元ANSYS软件分析了某型发动机高压涡轮在温度场及离心力作用下叶尖间隙在发动机工作过程中的变化情况，介绍了涡轮各构件换热边界条件的计算方法，给出了对涡轮盘施加温度场的新方法。计算结果表明：除起动初期及停车前的很短时间外，离心力引起的涡轮盘径向位移为轮盘总位移的20％左右；离心力所引起的叶片径向位移约为叶片总位移的5．5％。

Calculation Program for Turbine Tip Clearance and Result Analysis

Tip clearance numerical analysis is an important content of studying tip clearance control and improving engine performance. In this paper ANSYS software is used to analyze the variation of tip clearance when engine operates under the conditions of temperature and rotational speed. This paper presents the calculation of thermal loads applied to every part of turbine. And a new method is given to apply thermal loads to turbine disk. Analyzed results show displacement response under rotational speed is about 20% of total disk radial displacement except for a short time when engine starts and stops, while it is only 5.5% of blade radial displacement.