Dynamic Analysis of 2.5D C/C Composites Finger Seal

Lu, Fei; Chen, Guo Ding; Liu, Jian

doi:10.4028/www.scientific.net/amm.378.159

Cited by 1 publication

(3 citation statements)

References 5 publications

(7 reference statements)

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“…The inner loop is used to handle the load balance issue in order to solve and record the nodal contact pressure and nodal coordinate. Based on the FE contact analysis, the contact pressure is applied to predict the nodal wear rate by Equation (9). At each time increment, the wear depth of each beltshaped zone on finger foot bottom is calculated.…”

Section: Numerical Algorithmmentioning

confidence: 99%

“…The finite element (FE) model, 4 the equivalent dynamic model 5 and the porous media model 6,7 are typically established to study the leakage characteristic of the finger seal as well as its variation with structural configuration, 8 material and working parameters. 9,10 Most works mainly focus on the seal leakage prediction with the assumption that the effect of seal wear on leakage is neglected. However, finger seal contacts with its counterpart, and seal wear occurs inevitably.…”

Section: Introductionmentioning

confidence: 99%

“…Once the nodal contact pressure and nodal coordinate are solved from FE contact analysis, local wear rate of each node can be obtained by Eq. (9). A user subroutine UMESHMOTION is employed to specify wear rates as the constraint velocities on the nodes of finger foot bottom.…”

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confidence: 99%

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Wear modelling and sealing performance prediction of C/C composite finger seal

Jian

Pang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Due to the high speed and high pressure operating conditions, wear between the finger seal and the rotor is inevitable, and this leads to an increase of leakage clearance and becomes an important factor affecting the seal life. The theory of anisotropic elasticity was employed to describe the mechanical characteristics of the seal material. An improved Archard wear model was proposed to calculate the nodal wear rate, and the local wear direction was also determined. The wear simulation model and procedure were established based on the Arbitrary Lagrangian Eulerian adaptive mesh strategy. The effects of material density, fabric orientation, pressure differential and rotor speed on the wear characteristics of finger seal and the change of leakage clearance caused by wear loss were studied. The results show that the wear first occurs at the heel area of the finger foot bottom and gradually extends to the toe area. C/C (carbon fibre reinforced carbon matrix) composite finger seal with higher material density has smaller leakage clearance and wear depth. With the increase of fabric orientation angle, the wear depth in the heel area of finger foot is smaller, and the circumferential wear area is narrower. The average wear depth of finger seal decreases with the orientation angle. When the orientation angle is 0, the seal leakage clearance is smaller. The increase of pressure differential not only aggravates the seal wear, but also expands the wear area, and also increases the average contact pressure and leakage clearance. Increasing the rotor speed make the wear depth of the heel area of finger foot gradually increase, but the wear area becomes narrower. The average contact pressure decreases and the average leakage clearance increases. This study provides a theoretical method and basis for the prediction and evaluation of the wear life and performance of C/C composite finger seal.

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Section: Numerical Algorithmmentioning

confidence: 99%