高压涡轮叶顶间隙变化的数值分析

利用有限元分析软件分析了某型高压涡轮叶顶间隙在不同工况下随时间的变化。采用分段加载方法对模型施加温度和压力边界条件。计算结果与实验数据的对比分析表明:涡轮叶片位移对叶顶间隙变化的贡献不大,温度和转速是影响轮盘径向尺寸变化的主要因素,而温度是影响机匣和叶片变形的主要因素。

Numerical analysis of high pressure turbine tip clearance variation

The high pressure turbine tip clearance variation versus time under different operating conditions were analyzed by the finite element method. The boundary conditions about the temperature and pressure were loaded by means of the segmental application method. The calculation results and their comparison with the experimental data show that the displacement of the blade makes a little contribution to the tip clearance variation, the temperature and the rotational speed are the key issues for the radial deformation of the turbine disc, and the temperature is the major factor affecting the deformation of the turbine shroud and blade.