Deng, Q.; Sun, X.; Xu, H.; Mao, W. Thermal Characteristics of Dry Gas Seal in Startup Process Considering Microscale Effects. Lubricants2023, 11, 503.
Deng, Q.; Sun, X.; Xu, H.; Mao, W. Thermal Characteristics of Dry Gas Seal in Startup Process Considering Microscale Effects. Lubricants 2023, 11, 503.
Deng, Q.; Sun, X.; Xu, H.; Mao, W. Thermal Characteristics of Dry Gas Seal in Startup Process Considering Microscale Effects. Lubricants2023, 11, 503.
Deng, Q.; Sun, X.; Xu, H.; Mao, W. Thermal Characteristics of Dry Gas Seal in Startup Process Considering Microscale Effects. Lubricants 2023, 11, 503.
Abstract
The heat generated during the startup process of dry gas seals, such as the friction heat of the asperities, viscous shear heat, and the expansion heat of the gas film, easily leads to seal failure and endangers the stable operation of turbomachinery. This study combines the statistically modified contact model and the average Reynolds equation by considering the adiabatic index and the microscale effects of dry gas seals to explore the heat generation characteristics of dry gas seals formed in series at multiple times. In particular, the change laws and influencing factors among the components, including the friction heat of asperities and the shear heat and expansion heat of the gas film and total heat, are investigated. A comparative analysis indicates that the slip flow effect increases the total heat during the startup process. The friction heat is much greater than expansion heat and shear heat. Despite constant acceleration, exponential acceleration, or Harrision acceleration, the heat changes are uneven during the startup process. In particular, the heat changes sharply in the early stage and gently in the later stage. The Harrision acceleration mode is the most conducive to sealing stability.
Keywords
dry gas seal; thermal characteristics; slip flow; acceleration mode
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
