论文部分内容阅读
表面织构靴底流体动压指尖密封是本文提出的一种新型柔性气体密封。建立了具有圆形微坑表面织构靴底的指尖密封分析模型,采用流固耦合有限元数值计算方法,分析了不同工况和织构结构条件下表面织构靴底流体动压指尖密封的泄漏率、气膜承载力及气膜流场特征。结果表明具有圆形微坑织构靴底的指尖密封具有较低的泄漏率和较高的气膜承载力,通过与现有典型人字槽流体动压指尖密封和接触式指尖密封的性能对比,进一步说明了表面织构靴底指尖密封的综合性能优势。流体压差对表面织构靴底流体动压指尖密封的性能影响较大;压差较大时,适当增大微坑直径、减小微坑深度、采用均匀分布的微坑结构形式,有利于提高密封性能。本文工作为设计性能良好的指尖密封结构提供了一种新思路。
The hydrodynamic fingertip seal on the surface texture of the sole is a new type of flexible gas seal proposed in this paper. A fingertip seal analysis model with circular microgroove surface texture boot sole was established. Finite element method of fluid-solid coupling was used to analyze fingertip fingerprints under different conditions and texture structures Seal leakage rate, film bearing capacity and film flow field characteristics. The results show that the fingertip seal with a circular micro-crater bottom has a lower leakage rate and a higher film bearing capacity. By sealing with the existing typical herringbone hydrofluorocarbon finger-tip and contact fingertip Performance comparison, further illustrates the overall texture fingertip soles seal sealing performance advantages. The fluid pressure difference has a great influence on the hydrodynamic fingertip seal performance of the surface textured sole. When the pressure difference is larger, the diameter of the pit is increased and the depth of the pit is reduced. The uniform distribution of the pit structure Will help improve the sealing performance. This work provides a new idea for designing a fingertip seal with good performance.