Dynamic performance analysis and parameter collaborative optimization of floating seal dam compliant foil face gas seal

Article Engineering, Mechanical

Investigation of performance and parametric optimization of the typical spiral groove dry gas seal under transient disturbance operating condition

Hao Shang et al.

Summary: This paper investigates the transient performance of dry gas seals under axial displacement disturbances. The study finds that the upstream pumping spiral groove can restore stable operation in the shortest time, but with increased leakage rate. On the other hand, spiral groove and double-row spiral groove dry gas seals are more sensitive to displacement disturbances, which aggravates the possibility of wear and collision of sealing rings.

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING (2022)

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Article Engineering, Mechanical

Research on the operation mechanism and performance of bump-type compliant foil face gas seal

Yuan Chen et al.

Summary: This paper presents a novel bump-type compliant foil face gas seal (BCFFGS) and proposes a theoretical model that combines the Reynolds equation and foil deformation equation to investigate the operation mechanism of BCFFGS. The study compares BCFFGS with rigid surface face gas seal (RSFGS) in terms of film pressure, film thickness, and flow field, and obtains a range of preferred structural parameters that significantly affect the sealing performance of BCFFGS. Numerical results indicate the intrinsic relationships among film pressure, foil deformation, and film thickness for BCFFGS. Furthermore, the performance analysis shows that BCFFGS outperforms RSFGS under the studied parameters. BCFFGS achieves the best sealing performance and stability at the slope ratio of 0.2-0.3, the foil-dam ratio of 1.5-1.8, and the number of cycles of 12-16.

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING (2022)

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Article Thermodynamics

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

Yuan Chen et al.

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

ADVANCES IN MECHANICAL ENGINEERING (2022)

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Article Engineering, Mechanical