Progressive wear prediction of C/C composite finger seal based on ALE adaptive meshing strategy

Lu, Fei; Chen, Guoding; Su, Hua; Wang, Lina; Zhang, Yanchao

doi:10.1177/1350650116667344

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…The ALE adaptive meshing strategy combines advantages of the traditional Lagrangian method and the Eulerian method. 20 It can constrain mesh motion to the material motion only where necessary, and can also define the independent material motion and mesh motion otherwise. This method could ensure the mesh topology unchanged throughout the wear analysis by adjusting the surface and the interior nodes of the FE model.…”

Section: Wear Modelling and Numerical Implementationmentioning

confidence: 99%

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: Wear Modelling and Numerical Implementationmentioning

confidence: 99%

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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“…Therefore, to ensure the position of the node was not distorted, and to achieve a high simulation accuracy during the simulation process, the modified node coordinates were reset using the built-in ALE, and adaptive mesh-smoothing algorithm of Abacus. 20 Thus, after the coordinates of the node on the spline surface were modified in Abacus, the ALE and adaptive mesh-smoothing algorithm were reused to optimize the mesh quality. The adjustment principle is shown in Figure 15.…”

Section: Prediction Of Fretting Wearmentioning

confidence: 99%

Experimental investigation and prediction method of fretting wear in rack-plane spline couplings

Xue

Jia

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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To investigate the fretting wear of involute spline couplings in aerospace, rack-plane spline couplings rather than the conventional involute spline couplings in aerospace were used to conduct tribological experiments, and it was assumed that the rack-plane spline couplings exhibit consistent contact stress with the real involute spline couplings in aerospace. The relationships among the static friction coefficient, dynamic friction coefficient, and fretting friction coefficient were established via tribological experiments, as well as the fretting-wear mechanism of the rack-plane spline couplings was examined. A fretting-wear estimation model based on the fretting-wear mechanism was developed. By applying the modified Archard equation and Arbitrary Lagrangian–Eulerian adaptive, mesh smoothing algorithm of Abacus was used. According to our experimental results, the fretting wear of the rack-plane spline couplings consisted primarily of abrasive wear, oxidative wear, and adhesive wear. For both, lubrication and non-lubrication settings, the fretting friction coefficient of 18CrNi4A steel (0.27) fluctuated between 0.12 (dynamic friction coefficient) and 0.35 (static friction coefficient). The fretting-wear results estimated via numerical prediction were consistent with the experimental results. When sm (vibration amplitude) was 20, 35, and 50 µm, the most difference in the fretting wear between the experimental results and numerical estimation was 0.001, 0.0007, and 0.001 mm, respectively. Therefore, the proposed model provides a method for accurate estimation of the fretting-wear. Additionally, the model contributes to the precise design of involute spline couplings in aerospace.

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“…According to the service conditions of the cylindrical inter-shaft seal, the sealing ring material should have good thermal performance, low and stable friction coefficient, high strength, and low weight. Considering the self-lubricating characteristics of C/C composites, it helps to reduce seal friction and wear, and compared to graphite sealing materials, it shows significant improvement in strength, friction and wear, and heat dissipation capacity [24,25]. Hence, we propose a layered C/C composite cylindrical reverse inter-shaft seal, establish a fluid-solid coupling performance analysis model, study its leakage and bearing capacity under different operating conditions, and compare its performance with that of the graphite cylindrical reverse inter-shaft seal.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the C/C Composite Cylindrical Reverse Inter-Shaft Gas Film Seal

Zhao

Yang

2023

Lubricants

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The reverse inter-shaft gas film seal is a gas path seal used in the intermediate bearing cavity of an aero-engine, which is challenging to implement due to its special installation and usage conditions. This paper proposes a C/C (Carbon/Carbon) composite cylindrical reverse inter-shaft seal structure and carries out a performance simulation analysis based on bidirectional fluid–solid coupling technology. The results show that the cylindrical reverse inter-shaft gas film seal with double-layer C/C composite sealing rings with different material mesoscopic parameters can balance seal leakage and friction power consumption and is beneficial to improving the comprehensive performance of the seal. As the mesoscopic parameters of the inner sealing ring material increase in warp and weft density, the sealing leakage rate decreases, and the gas film force and gas friction power consumption all increase. As the pressure difference increases, the sealing leakage rate and gas film force increase. As the rotation speed of the inner and outer rotors increases, the seal leakage rate increases, and the gas film force decreases. A C/C composite sealing ring cylindrical reverse inter-shaft gas film seal has a lower leakage rate and larger gas film force than a graphite sealing ring cylindrical reverse inter-shaft seal, which confers certain performance advantages. The work in this paper can provide a reference for the design of reverse inter-shaft seals.

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Progressive wear prediction of C/C composite finger seal based on ALE adaptive meshing strategy

Cited by 6 publications

References 30 publications

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

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

Experimental investigation and prediction method of fretting wear in rack-plane spline couplings

Performance Analysis of the C/C Composite Cylindrical Reverse Inter-Shaft Gas Film Seal

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