| Citation: | LIU Enyu, SUN Dan, TAN Quanchang, et al. Numercal investigation on floating disturbance effect of differential diameter brush seal with fluid-structure coupling[J]. Journal of Aerospace Power, 2026, 41（5）：20240441 doi: 10.13224/j.cnki.jasp.20240441
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The traditional brush seal has the problem of too short premature failure life due to the bristles floating disturbance effect. The dynamic model of bristles floating disturbance of brush seal was analyzed theoretically. New type of brush seal structure with differential diameter to suppress the floating disturbance effect of bristles was proposed. A three-dimensional transient solution model of differential diameter brush seal was established based on the Arbitrary Lagrange-Eulerian (ALE) fluid-solid coupling method. The deformation characteristics of bristle tips were quantitatively analyzed, and the influences of structural parameters and working condition parameters on the bristles floating disturbance effect of differential diameter brush seal were studied. The results showed that differential diameter brush seal increased the bristles stiffness by increasing the diameter of the front bristles through differential arrangement of the brush wire, which can enhance the anti-disturbance ability of the brush wire and improve the sealing performance of the traditional brush seal. Increasing the pressure ratio, the protection height of the front plate, and the axial clearance between the front plate and the brush beam can enhance the floating disturbance effect of the bristles. The differential diameter brush seal can suppress the brush floating disturbance effect. Under the working condition parameters and structural parameters, the average deformation of the free end of the bristles of the differential diameter brush seal can be reduced by 10.98%—20.39% compared with the traditional brush seal.
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