关键词: 航空发动机;指尖密封;泄漏特性;数值计算;试验

Abstract: To study the leakage characteristic of finger seal under different differential pressure and rotational speed, a numerical calculation model with CFD porous media was built in this paper. The leakage characteristic of finger seal used in a specific aero engine was analyzed. To verify the numerical calculation model, an experimental study of leakage characteristic of finger seal under simulating certain differential pressure and rotational speed was developed. To study variations of porous media parameters caused by differential pressure and centrifugal expansion of rotor, the calculation method was analyzed based on the experimental results, correction factor C_k for differential pressure and correction factor k for centrifugal expansion were raised and validated. The results show that, without introducing correction factor C_k for differential pressure and correction factor k for centrifugal expansion, calculated leakage characteristic of finger seal deviate from the experimental values with the increase of differential pressure and rotational speed. While introducing correction factor C_k for differential pressure and correction factor k for centrifugal expansion, the calculated results are in agreement with the experimental results, and do not deviate from the experimental results with the increase of differential pressure and rotational speed, the maximum deviation is less than 11%, and the average deviation is less than 6%.

Key words: Aero engine;Finger seal;Leakage characteristic;Numerical calculation;Experiment