Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Influence of seal flow rate on unsteady flow structure of an axial turbine with radial rim seal configuration
| DOI: | 10.11809/bqzbgcxb2025.01.019 |
| Keywords: | minimum seal flow rate; radial seal; rim seal mechanism; unsteady numerical simulation; turbine cavity |
| Abstract: | The determination of the minimum seal flow rate is the main purpose of studying turbine rim seal flow. The influence of seal flow rate on the sealing effect of axial flow turbine with radial seal configuration has been investigated through unsteady numerical method. The results show that with the increase of seal flow rate, the number of vortex structures in the cavity increases, and the intensity of the swirling ingestion and outflow structures in the seal clearance weakens. The unsteady fluctuation in the inner axial seal clearance increases until the inner axial clearance is sealed completely, and the unsteady fluctuation decreases as the seal flow rate continues to increase. The seal flow rate when the fluctuation in the seal gap achieves maximum can be considered as the minimum seal flow to achieve complete sealing. This provides a reference criterion for judging the minimum seal flow rate under test conditions. When designing sealing structures, optimizing the dimensions of the sealing structure, introducing superimposed sealing flows within the gaps, and designing honeycomb structures on the sealing teeth can all generate significant unsteady fluctuations. These methods help reduce the minimum sealing flow and improve sealing efficiency. |
| Issue: | Vol. 46 No. 1 (2025) |
| Published: | 2025-01-31 |