Transactions of Nanjing University of Aeronautics & Astronautics
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A HYDRODYNAMIC MODEL FOR DIMPLED MECHANICAL GAS SEAL CONSIDERING THE “INTERACTION EFFECT”
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Abstract:
The mechanical gas seal of aero engine have to face the problems of high wear rate and short lifetime. Surface texture has shown beneficial effects over the tribological characteristics. In the present study, a hydrodynamic model for dimpled annular area of mechanical gas seal considering the “interaction effect” between neighboring two dimples is developed based on Reynolds equation. Different multi-row columns are chosen and the dimensionless pressure in radial and circumferential directions is calculated. The results indicate that the “interaction effect” is more obvious in circumferential direction than in radial direction even the area and depth of the dimples are same. It has also been found that, for 5×5column, the dimensionless average pressure value considering the “interaction effect” increased by 45.41% compared with 1×5column. Further analysis demonstrates the model with 5×5column can be more reasonable based on the consideration on both computing time and accuracy to investigate the hydrodynamic effect for dimpled mechanical gas seal.
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Project Supported:
The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
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