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    • Design and Optimization of Brush Seal in Gas Turbine Bearing Cavity
    DOI：10.13949/j.cnki.nrjgc.2025.02.014
    Key Words:brush seal  orthogonal experiment  porous media  flow field analysis
    Author NameAffiliationE-mail
    YIN Yi School of Mechanical Engineering， Xihua University， Chengdu 610039， China 416063448@qq.com 
    ZHU Weibing* School of Mechanical Engineering， Xihua University， Chengdu 610039， China 2411716352@qq.com 
    HU Junrui School of Mechanical Engineering， Xihua University， Chengdu 610039， China 704747664@qq.com 
    YAN Zhaoqiang Zigong Zhaoqiang Sealing Products Industrial Co.， Ltd.， Zigong 643000， China yanzhaoqiang@zqtckj.com 
    WANG Heshun School of Mechanical Engineering， Xihua University， Chengdu 610039， China wangheshun@mail.xhu.edu.cn 
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    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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