Dynamic analysis of finger seal in the complex working state

Zhao, Hailin; Chen, Guoding; Wang, Lina; Su, Hua

doi:10.1177/0954410017729714

Cited by 3 publications

(2 citation statements)

References 20 publications

(33 reference statements)

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“…As a compliant seal, finger seals are well known for the low leakage rate and long service life and have enormous application potential in the fields such as aero-engine, gas turbine and so on [1,2]. The direct contact between the finger feet and the rotor inevitably leads to friction and wear, and as a result, the wear performance between them becomes a significant factor affecting the working stability of finger seals [3]. Currently, methods to improve the wear resistance of finger seals mainly rely on new materials [4,5], new structures [6,7], and surface coatings [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of snake-biomimetic surface texture on finger sealing performance under hydrodynamic lubrication

Chen¹,

Zhang²,

Cui³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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In recent years, surface textures have been found with extraordinary potential to improve lubrication of friction pairs, reduce viscosity, and improve wear resistance. To study the effects of surface textures in the finger sealing, as inspired by the snakeskin, four texture forms with different layouts are presented in this paper and comprehensive performance analysis is carried out under the condition of hydrodynamic lubrication. First, a numerical model of finger seals with surface textures under hydrodynamic lubrication is proposed based on the Reynolds equation. Then, finger seal performance analysis is carried out considering different texture surfaces in terms of forms, layouts, and geometric parameters. The results show that: (1) When the texture profile is consistent with the direction of rotor motion, it is beneficial to create better hydrodynamic pressure and improve sealing performance; (2) To achieve good friction and wear resistance of a textured finger seal, the texture depth should be as shallow as possible (<25 μm); (3) When the texture depth is equal to the seal clearance, the average dimensionless pressure reaches the greatest with smallest friction coefficient; (4) With the increase of the texture density, the average dimensionless pressure increases rapidly first and then gradually flattens, while the friction coefficient performs oppositely. Given the manufacturing economy, the suitable texture density is around 20%∼40%.

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Section: Introductionmentioning

confidence: 99%

Effect of snake-biomimetic surface texture on finger sealing performance under hydrodynamic lubrication

Chen¹,

Zhang²,

Cui³

et al. 2021

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

show abstract

“…5 The wear problem has been studied at home and abroad for a long time. 6 For example, in reference, 7,8 wear in complex working conditions will affect the dynamic performance of the mechanism. Wear is a phenomenon in contact.…”

Section: Introductionmentioning

confidence: 99%

Wear analysis of finger locks with different design parameters for landing gear

Zhang

Nie

2020

Science Progress

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The finger lock in the retractable actuator of the landing gear will wear during repeated unlocking and locking. Therefore, the effects of six parameters including the material of the finger lock, the length of the finger lock, the diameter of the finger lock, the number of petals, and the angle of the fingertip on the unlocking force after 500 unlocking cycles are researched. Archard wear theory was performed to obtain the unlocking force after wear and the influence of six key parameters on the unlocking force in this paper. Then, wear experiment was designed and the effectiveness of model and the influence of six parameters were verified. The results show that the chamfers of the finger lock was most worn, causing the value of the axial unlocking force during the transition phase to increase, but it has little effect on the maximum unlocking axial force. The material of the lock has little effect on the axial force; the length, diameter and the number of petals are inversely proportional to the axial force, and the angle of the fingertip is proportional to the axial force. Using Archard method can effectively calculate the finger pattern wear of locks.

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Effects of Snake-Bioinspired Surface Texture on the Finger-Sealing Performance under Varied Working Conditions

et al. 2022

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The tribological performance of the friction pair between the rotor and finger feet is a crucial index affecting the service life of finger seals. In recent years, the surface texture has attracted a considerable number of researchers owing to its extraordinary potential in improving antifriction and wear resistance. This paper, inspired by snakeskins, introduces three texture forms (e.g., diamond, ellipse, and hexagon) into the rotor. The effects on finger-sealing performance are analyzed by considering finger seals’ varied working conditions. First, a numerical model of textured finger seals under hydrodynamic lubrication is established based on the Reynolds equation. Then, the sealing performance analysis of textured finger seals is performed considering varied working conditions given rotation speed, pressure difference, seal clearance, and working temperature. The numerical results show that: (1) the textured domain produces a noticeable hydrodynamic pressure effect and cavitation, which effectively improves the bearing capacity of the fluid film; (2) the higher the rotation speed or the lower the inlet/outlet pressure difference, the stronger the dynamic pressure effect of textured finger seals and the better the antifriction and wear resistance; (3) for good antifriction and wear resistance of a textured finger seal, the seal clearance should be as shallow as possible (≤10 μm), and the working temperature should be as low as possible (≤120 °C); and (4) the ellipse texture has a higher average dimensionless pressure and a lower friction coefficient, which is superior to diamond and hexagon ones in terms of friction and wear performance.

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Dynamic analysis of finger seal in the complex working state

Cited by 3 publications

References 20 publications

Effect of snake-biomimetic surface texture on finger sealing performance under hydrodynamic lubrication

Effect of snake-biomimetic surface texture on finger sealing performance under hydrodynamic lubrication

Wear analysis of finger locks with different design parameters for landing gear

Effects of Snake-Bioinspired Surface Texture on the Finger-Sealing Performance under Varied Working Conditions

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