Experiment on the effect of protrusion amount on sealing efficiency of different rim seals

The effect of different protrusion amounts on various parameters (static pressure, total pressure, sealing efficiency) was experimentally studied by measuring carbon dioxide volume fraction, so as to obtain the change rule of the sealing efficiency and the minimum flow rate of sealing air of different sealing structures. In the experiment, the experimental parameters of different dimensionless sealing flow rates were measured under the condition that the annulus Reynolds number and the rotating Reynolds number changed within a certain range. The results show that the change of the protrusions amount has little effect on the static pressure in the cavity, and the static pressure change near the sealing ring is almost negligible. The total pressure and sealing efficiency will increase with the increasing protrusion amount. However, the degree of change in the different sealing structures is different. As a whole, the efficiency of radial rim seal is most obvious, and the improvement of the axial rim seal and double teeth rim seal is less. For each additional protrusion, the minimum sealing flow rate required for each of the three structures can be reduced by 0.96%, 0.30%, 0.28%, respectively. In addition, the rotating Reynolds number will have a more significant effect on the sealing efficiency after the protrusions are installed.