刷式篦齿组合密封性能试验研究

与传统篦齿密封相比，刷式密封作为一种新型密封装置，密封性能改善明显。但在高压差条件下，刷式密封的封严性能提升效果不明显。为满足航空发动机高压差高性能需求，本文设计一种刷式篦齿组合密封来提升刷式密封的综合封严性能。刷式密封和刷式篦齿组合密封泄漏特性的仿真分析及对比试验结果表明，同工况条件下，刷式篦齿组合密封相比刷式密封，其泄漏量可减小（34.7%～68.5%），封严性能更优异。因而，刷式篦齿组合密封为航空发动机高压差密封提供新的低成本途径，且结构紧凑、泄漏量低。

Experimental Study on Hybrid Brush-Labyrinth Sealing Performance

Compared to the labyrinth seal, the brush seal, as a novel seal method, is better than the labyrinth seal in terms of the sealing performance. However, the brush seal shows unsatisfactory sealing performance under the high-pressure difference working condition. In order to meeting the sealing demands in aero-engines, the paper designed a hybrid brush-labyrinth seal to improve the brush seal performance. Both numerical simulation and experimental study on the brush seal and brush-labyrinth sealing performance showed that the leakage of brush-labyrinth seal decreased by 34.7% to 68.5% of the leakage of brush seal under the same working conditions, indicating a significant sealing performance improvement. The hybrid brush-labyrinth seal provides a new and low-cost method with a compact structure and low leakage for sealing demands in aero-engines.