摘要
基于多孔介质模型,采用计算流体力学软件Fluent对常规、低滞后矩形及翼型3种刷式密封泄漏流动特性进行数值模拟,结果表明:相比于常规刷式密封,矩形刷式密封迟滞性并没有得到改善,翼型刷式密封在降低迟滞性的同时泄漏量却大大增加。为改进低滞后刷式密封的性能,提出背板轴向间隙的概念,并研究背板轴向间隙对低滞后刷式密封泄漏流动特性的影响,结果表明:在前后压比一定的条件下,泄漏量与轴向间隙成正比,而泄漏增加量与轴向间隙成反比,且均在轴向间隙较小时变化较明显;相较于矩形刷式密封,轴向间隙密封随着轴向间隙的增大,背板处压力值除在保护高度区域内略有提高外,在其他区域均明显下降,且轴向间隙由0增大到0.1 mm时的压力下降效果最明显。
Based on the porous media model, numerical simulation was performed to research the leakage flow charac- teristics of brush seal with three different kinds of groove, including conventional brush seal, rectangular brush seal and airfoil brush seal. Results indicate that, compared to conventional brush seal, the rectangular brush seal＇ s hysteresis is not been improved. The airfoil brush seal＇ s hysteresis is reduced greatly, but its leakage is increased a lot at the same time. In order to improve the performance of low hysteresis brush seal, the concept of backplane axial clearance was put for- ward, and the influence of backplane axial clearance on the leakage flow characteristics of low hysteresis brush seal was re- searched. The results indicate that, under the certain compression ratio, the leakage flow rate is proportional to the axial clearances, while the leakage increasement is inversely proportional to the axial clearances, and both of the changes can be found more obviously when the axial clearance is small. Compared with rectangular brush seal, the axial clearance seal＇ s pressure values at backplate is reduce a lot with the increase of the axial clearance except at protection height region, and the most obvious pressure drop effect can be obtained when the axial clearance is increased from 0 to O. 1 mm.
出处
《润滑与密封》
CAS
CSCD
北大核心
2015年第2期67-72,共6页
Lubrication Engineering
关键词
刷式密封
槽型
轴向间隙
迟滞性
泄漏流动特性
brush seal
groove
axial clearance
hysteresis
leakage flow characteristic
