This paper presents a numerical investigation of lifting and sealing performance of a whole ring of finger seal with grooving pad structures. Different grooves on the bottom of lifting pad, such as one and two straight grooves, or two herringbone grooves with different gradients etc. are simulated. The rotor vibration is taken into account during the numerical computation. Computational results indicate that the complete ring model is more suitable than an individual finger model to simulate the fluid-solid interactions of the finger seal. Vibration of the rotor changes the deformation pattern of finger seal, and the seal deformation should adapt the clearance in a uniform way according to the rotor position. The grooving pad structures have effects on the leakage flows and the lifting force on the finger. Analytical data revealed the self-adaptive performance of finger seal to rotor vibration. This will be helpful to make the finger seal be of lower wear and smaller leakage in rotational sealing system.

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