| Citation: | SUN Jisheng, SUN Dan, ZHAO Huan, et al. Numerical investigation on bristles buoyancy effect of suppressed-disturbance brush seals with fluid-structure interaction[J]. Journal of Aerospace Power, 2024, 39（10）：20220770 doi: 10.13224/j.cnki.jasp.20220770
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Suppressed-disturbance (SD) brush seal structure was presented. A three-dimensional transient solution model for bristles buoyancy effect of the brush seal with disturbance suppression was established based on arbitrary Lagrange-Eulerian (ALE) fluid-structure coupling method. The leakage characteristics and velocity characteristics of the brush seal with different SD hole structures were studied, and the influence of the structural parameters of SD holes on bristles buoyancy effect of brush seal was studied. The results showed that the SD hole in the front plate of the traditional brush seal can change the stress state of the front bristles, and the front bristles were subjected to a torque opposite to the direction of disturbance, effectively inhibiting the bristles buoyancy effect, and significantly improving the sealing performance of the traditional brush seal. Compared with the traditional brush seal prone to produce the bristles buoyancy effect, reducing the height of the SD hole and increasing the diameter and number of the SD hole can effectively reduce the leakage of the brush seal. Increasing the number of rows of SD hole to 3 rows can reduce the leakage of brush seal by 30.2%. The setting of the SD hole structure can inhibit the deformation of the front bristles caused by the bristles buoyancy effect. Compared with the traditional brush seal, the height of the SD hole was set to 3.75 mm, the diameter of the SD hole was set to 1.5 mm, and the number of rows of the SD hole was set to 3 rows, which reduced the average deformation of the free end of the brush by 53.2 %, 34.8 % and 54.0 %.
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