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In this paper a new blade tip shape, triple squealer, has been proposed. This shape is based on the conventional double squealer, and the cavity on the tip surface is divided into two parts by using a third squealer along the blade camber line. Four cases for the ratio of groove depth to span (GDS ratio): 0.75%, 1.5%,2.25%, and 3%, which correspond to 50%, 100%, 150%, and 200% of the tip clearance to span ratio, respectively, were taken up to investigate the effects of the GDS ratio on the flow field and losses. The flat tip case (baseline case) and the double squealer case were also calculated for comparison. The in-house, unstructured, 3D, Navier-Stokes, finite volume, multiblock code with DES (Detached Eddy Simulation) as turbulence model was used to calculate the flow field. It was found from calculated results that reduction in the mass flow rate of leakage flow in the case of a triple squealer with a GDS ratio of 1.5% is 8 times that for the double squealer case.

목차

Abstract
1. INTRODUCTION
2. MODEL EMPLOYED IN THIS STUDY
3. COMPUTATIONAL METHOD
4. RESULTS AND DISCUSSION
5. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

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