| Citation: | YUAN Jinglin, SU Hua, HUANG Yuhui. Dynamic performance analysis of double interlocking padded finger seal based on fluid-structure interaction[J]. Journal of Aerospace Power, 2025, 40（2）：20230224 doi: 10.13224/j.cnki.jasp.20230224
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A non-contact finger seal structure with double beams and double boots interlocking was proposed. A fluid-structure coupling numerical analysis model of dynamic performance of the sealing system was established. Sinusoidal excitation was applied to the rotor, and the effects of rotor speed, pressure difference and rotor excitation amplitude on dynamic air film bearing capacity, maximum deformation and leakage rate of the double interlocking padded finger seal were studied respectively, and compared with the typical single padded non-contact finger seal structure performance. The results showed that under low speed and low pressure conditions, the double interlocking padded finger seal shoe had good tracking performance against different amplitude rotor excitation; at high speed and high pressure, the following performance was reduced. In addition, under high speed and high pressure conditions, the gas film bearing capacity significantly increased, and the leakage rate significantly decreased with the increase of excitation amplitude during the upward run-out stage of the rotor. Compared with a typical single padded finger seal, the leakage factor of the double interlocking padded finger seal decreased by an average of about 25%. The reasonable design of the initial installation clearance can avoid the collision between the rotor and the sole of the shoe. This work can provide an idea for designing non-contact finger seal meeting high operating conditions.
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