A novel design for discrete surface texture on gas face seals based on a superposed groove model

Jiang, Jinbo; Zhao, Wenjing; Peng, Xudong; Li, Jiyun

doi:10.1016/j.triboint.2020.106269

Cited by 26 publications

(12 citation statements)

References 31 publications

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“…According to the steady flow continuity principle, the leakage rate should not vary with radius. 24 The leakage of CFFGS occurs at the end face of the sealing dam. Ignoring the variation of the gas viscosity μ and the width of the sealing dam ( r g – r i ), the leakage rate is determined by the pressure of the inner and outer radius of the sealing dam and the balance film thickness h 0 , which is expressed as:…”

Section: Theoretical Modelsmentioning

confidence: 99%

Flow field and sealing performance analysis of compliant foil face gas seal

Chen

Wang

Peng

et al. 2022

Advances in Mechanical Engineering

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Based on the theory of gas lubrication and elastic mechanics, a theoretical model of gas-elastic coupling lubrication of compliant foil face gas seal (CFFGS) is presented. The correlation between the film pressure and thickness of CFFGS and its effect on the flow field are investigated, and the differential effect of pressure conditions on the flow field and sealing performance is analyzed. Also explored the influence law of operating and structural parameters on sealing performance. Results show that CFFGS have stable and excellent leakage control performance, and the pressure forms has a differential effect on the coordination mechanism of film pressure-deformation-film thickness and the sealing performance. Moreover, compliant foil structure has a positive impact on the end-face adaptive capability and leakage control performance of the seal.

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Section: Theoretical Modelsmentioning

confidence: 99%

Flow field and sealing performance analysis of compliant foil face gas seal

Chen

Wang

Peng

et al. 2022

Advances in Mechanical Engineering

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“…Recently, some scholars observed and studied the surface morphology of earthworms [8], pangolins [9], snakes [10], fishes [11], snails [12], and other organisms, and found that these surface morphologies usually have good properties of desorption, anti-adhesion and wear resistance [13]. Inspired by the biological surface morphologies, the non-smooth surface has been successfully applied to multiple occasions with relative motion, e.g., bearings [14], cylinder liners [15], mechanical seals [16], and cutting tools [17], to improve the tribological properties [18].…”

Section: Introductionmentioning

confidence: 99%

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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“…Dry gas seal (DGS), as a typical kind of noncontacting mechanical seal, meets satisfactorily the requirements of low leakage rate, wear-free operation, and low power consumption for industrial centrifugal compressors, pumps, fans and other turbomachines with medium speed, which includes hydrodynamic and hydrostatic type. [1][2][3] The gas film stiffness of DGS and thrust bearing is strongly dependent on the geometry of the supply system, that is, restrictor. [4][5][6] However, it is difficult for the classical fixed orifice restrictor to adjust the geometrical structure according to the variation of external conditions, resulting in poor gas film stability.…”

Section: Introductionmentioning

confidence: 99%

Fluid-structure coupling model and output characteristics of a diaphragm-type restrictor

Cai

Jiang

Meng

et al. 2022

Advances in Mechanical Engineering

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The film stiffness of gas-lubricated hydrostatic bearings and seals are considered to be enhanced remarkably by proper design of a diaphragm-type restrictor. A fluid-structure coupling numerical model by coupling iteration of small deflection bending differential equation of circular thin plate and one-dimensional Reynolds equation was established, and the influence of different parameters, including pressure and geometrical parameters, on the flow output characteristics of a diaphragm-type restrictor was investigated numerically and experimentally. The results show that the correctness of established fluid-structure coupling numerical model is verified well by comparing calculated values of diaphragm deformation and output flow characteristics to the measured values. The optimum values of diaphragm thickness is 0.6–0.8 mm and initial throttle clearance is 20–35 μm for stable operation of diaphragm-type restrictor, while the optimum value of back pressure strongly depends on the diaphragm thickness.

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A novel design for discrete surface texture on gas face seals based on a superposed groove model

Cited by 26 publications

References 31 publications

Flow field and sealing performance analysis of compliant foil face gas seal

Flow field and sealing performance analysis of compliant foil face gas seal

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

Fluid-structure coupling model and output characteristics of a diaphragm-type restrictor

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