Calculations were performed to assess the effect of the tip leakage flow on the rate of heat transfer to blade, blade tip, and casing. The effect on exit angle and efficiency was also examined. Passage geometries with and without casing recess were considered. The geometry and the flow conditions of the GE-E3 first-stage turbine, which represents a modern gas turbine blade, were used for the analysis. Clearance heights of 0, 1, 1.5, and 3 percent of the passage height were considered. For the two largest clearance heights considered, different recess depths were studied. There was an increase in the thermal load on all the heat transfer surfaces considered due to enlargement of the clearance gap. Introduction of recessed casing resulted in a drop in the rate of heat transfer on the pressure side, but the picture on the suction side was found to be more complex for the smaller tip clearance height considered. For the larger tip clearance height, the effect of casing recess was an orderly reduction in the suction side heat transfer as the casing recess height was increased. There was a marked reduction of heat load and peak values on the blade tip upon introduction of casing recess; however, only a small reduction was observed on the casing itself. It was reconfirmed that there is a linear relationship between the efficiency and the tip gap height. It was also observed that the recess casing has a small effect on the efficiency but can have a moderating effect on the flow underturning at smaller tip clearances.
Skip Nav Destination
Article navigation
October 1999
Research Papers
Effects of Tip Clearance and Casing Recess on Heat Transfer and Stage Efficency in Axial Turbines
A. A. Ameri,
A. A. Ameri
AYT Corporation, Brook Park, OH 44142
Search for other works by this author on:
E. Steinthorsson,
E. Steinthorsson
Institute for Computational Mechanics in Propulsion (ICOMP), NASA Lewis Research Center, Cleveland, OH 44135
Search for other works by this author on:
D. L. Rigby
D. L. Rigby
NYMA, Inc., NASA Lewis Group, Cleveland, OH 44135
Search for other works by this author on:
A. A. Ameri
AYT Corporation, Brook Park, OH 44142
E. Steinthorsson
Institute for Computational Mechanics in Propulsion (ICOMP), NASA Lewis Research Center, Cleveland, OH 44135
D. L. Rigby
NYMA, Inc., NASA Lewis Group, Cleveland, OH 44135
J. Turbomach. Oct 1999, 121(4): 683-693 (11 pages)
Published Online: October 1, 1999
Article history
Received:
February 1, 1998
Online:
January 29, 2008
Citation
Ameri, A. A., Steinthorsson, E., and Rigby, D. L. (October 1, 1999). "Effects of Tip Clearance and Casing Recess on Heat Transfer and Stage Efficency in Axial Turbines." ASME. J. Turbomach. October 1999; 121(4): 683–693. https://doi.org/10.1115/1.2836720
Download citation file:
Get Email Alerts
A Digital Engineering Analysis of an Additively-Manufactured Turbine Vane
J. Turbomach (May 2025)
Mode Analysis for the Rotating Aerodynamic Disturbance of a Transonic Fan
J. Turbomach (May 2025)
Effect of Ceramic Matrix Composites on the Thermal Efficiency of a Power Generation Turbine
J. Turbomach (May 2025)
Heat Transfer Enhancement in Pulsating Flows: A Bayesian Approach to Experimental Correlations
J. Turbomach (May 2025)
Related Articles
Aerothermal Investigations of Tip Leakage Flow in Axial Flow Turbines—Part II: Effect of Relative Casing Motion
J. Turbomach (January,2009)
Aerothermal Investigations of Tip Leakage Flow in Axial Flow Turbines—Part I: Effect of Tip Geometry and Tip Clearance Gap
J. Turbomach (January,2009)
Effect of Squealer Geometry Arrangement on a Gas Turbine Blade Tip
Heat Transfer
J. Heat Transfer (June,2002)
RELATIVE CASING MOTION EFFECT ON SQUEALER TIP COOLING PERFORMANCE AT TIGHT TIP CLEARANCE
J. Thermal Sci. Eng. Appl (January,0001)
Related Proceedings Papers
Related Chapters
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
The Special Characteristics of Closed-Cycle Gas Turbines
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential