刷密封刷丝力学行为与密封性能

创建开发刷密封分析设计软件,模拟刷密封压力场与流场,研究刷丝动力学行为,如径向压紧等,与密封区域压场和流场相互作用,对密封性能产生影响.基于梁弯曲理论和刷丝区域压力分布,采用有限元法计算轴向与周向刷丝变形,并将相关计算结果与实验数据进行了对比,分析表明刷封出口区域在径向和轴向同时形成较大的压力梯度,使间隙趋于闭合并将丝间压紧,密封工作状态或间隙变化不大时,可保持稳定的密封性能. 

Mechanical behaviors of brush seals and sealing performance

The brush seal design and analysis software named Field CAL which was built independently. The mechanical behaviors of bristles are the main reasons of bristles ‘low down’ and hysteresis effect. The pressure field and flow field of brush seal were stimulated and the bristle mechanical behaviors were studied. The interactions between bristle mechanical behaviors and flow field influenced the sealing performance. Based on the cantilever beam theory and the calculated pressure distribution, bristle deflections in both the axial and circumferential directions were calculated utilizing the finite element method. The calculated results were compared with experimental results. The results show that the larger pressure gradients which are formed in radial and axial directions of the outlet of brush seal can close the clearance and blow down the bristles. It can maintain the steady sealing performance, when the states of working or clearance are changed. The research results are of referential value for the design and analysis of brush seals.