Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Labyrinth finger seal leakage flow characteristics research
| DOI: | 10.11809/bqzbgcxb2025.03.005 |
| Keywords: | finger seal; labyrinth seal; labyrinth finger seal; leakage flow characteristics; numerical simulation |
| Abstract: | In order to further meet the sealing performance requirements of modern aero engines under high differential pressure, a labyrinth finger sealing structure composed of labyrinth seal and finger seal was proposed according to the principle of superposition combination. The internal flow characteristics of the finger seal were treated as porous media, and the leakage of the labyrinth finger seal, the distribution of pressure, velocity and turbulent energy at the front and rear baffle protection heights were numerically simulated under the conditions of rotor stationary, different pressure ratios and given rotor speed, and compared with the finger seals with the same structural parameters. The results show that the leakage of the labyrinth finger seal is significantly smaller than that of the finger seal due to the dissipation of kinetic energy in multiple labyrinth sealing cavities, regardless of static or dynamic conditions. In addition, the turbulent flow energy on the rotor surface of the two sealing structures showed a stepwise decreasing trend, and the radial pressure of the front and rear baffle protection height close to the lower end basically approached the constant value, and the velocity and turbulent flow energy increased with the increase of the pressure ratio. This study provides a new way for the axial sealing of aero engines under high differential pressure, with compact structure and low leakage. |
| Issue: | Vol. 46 No. 3 (2025) |
| Published: | 2025-03-31 |