| 尹易,朱维兵,胡峻瑞,等.燃气轮机轴承腔处刷式密封设计与优化[J].内燃机工程,2025,46(2):121-128. |
| 燃气轮机轴承腔处刷式密封设计与优化 |
| Design and Optimization of Brush Seal in Gas Turbine Bearing Cavity |
| DOI：10.13949/j.cnki.nrjgc.2025.02.014 |
| 关键词:刷式密封 正交试验 多孔介质 流场分析 |
| Key Words:brush seal orthogonal experiment porous media flow field analysis |
| 基金项目:四川省国际港澳台科技创新合作项目（2024YFHZ0338） |
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| 摘要:针对燃气轮机轴承腔处密封问题，设计了一种二级错列式刷式密封结构。运用多孔介质模型，分析该种密封装置在特定工况条件下的压力与速度分布。利用有限元分析方法研究刷式密封的刷丝直径、刷丝束厚度、刷丝倾斜角等结构参数对密封性能的影响情况。采用正交试验法，分析不同结构参数组合下的泄漏情况，得到结构参数对密封性能的影响由强至弱依次为：刷丝直径、后挡板间隙、刷丝厚度、刷丝倾斜角、前挡板间隙。结合实际加工能力，对结构参数进行优选。优选结构参数为：刷丝直径0.005 mm，刷丝厚度3 mm，刷丝倾斜角20°，前挡板间隙1.6 mm，后挡板间隙0.6 mm。该结构参数下泄漏率为11.24 g/s，封严性能较优化前提高62.51%。 |
| Abstract:Aiming at the sealing problem of the gas turbine bearing cavity， a two-stage staggered brush seal structure was designed. A porous media model was used to analyze the pressure and velocity distribution of the seal under specific working conditions. The effects of structural parameters on the sealing performance of the brush seal， such as the fiber diameter， the thickness of the bristle and the inclination angle of the brush， were investigated by using the finite element analysis method. Orthogonal test method was used to analyze the leakage of different combinations of structural parameters. The structural parameters that have effects on the sealing performance from the strongest effects to the least effects are fiber diameter， back baffle gap， bristle thickness， cant angle of brush and front baffle gap. Combined with the actual processing capability， the structural parameters were optimized. The preferred structural parameters include fiber diameter 0.005 mm， bristle thickness 3 mm， cant angle of brush 20°， front baffle gap 1.6 mm and back baffle gap 0.6 mm. The mass flow rate of the optimized structure is 11.24 g/s， and the sealing performance of the optimized structure is improved by 62.51% compared with that before optimization. |
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