Modern dry low emissions (DLE) combustors are characterized by highly swirling and expanding flows that makes the convective heat load on the gas side difficult to predict and estimate. A coupled experimental–numerical study of swirling flow inside a DLE annular combustor model is used to determine the distribution of heat transfer on the liner walls. Three different Reynolds numbers are investigated in the range of 210,000–840,000 with a characteristic swirl number of 0.98. The maximum heat transfer coefficient enhancement ratio decreased from 6 to 3.6 as the flow Reynolds number increased from 210,000 to 840,000. This is attributed to a reduction in the normalized turbulent kinetic energy in the impinging shear layer, which is strongly dependent on the swirl number that remains constant at 0.98 for the Reynolds number range investigated. The location of peak heat transfer did not change with the increase in Reynolds number since the flow structures in the combustors did not change with Reynolds number. Results also showed that the heat transfer distributions in the annulus have slightly different characteristics for the concave and convex walls. A modified swirl number accounting for the step expansion ratio is defined to facilitate comparison between the heat transfer characteristics in the annular combustor with previous work in a can combustor. A higher modified swirl number in the annular combustor resulted in higher heat transfer augmentation and a slower decay with Reynolds number.
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September 2011
Research Papers
Study of Flow and Convective Heat Transfer in a Simulated Scaled Up Low Emission Annular Combustor
Sunil Patil,
Sunil Patil
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
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Teddy Sedalor,
Teddy Sedalor
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
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Danesh Tafti,
Danesh Tafti
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
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Srinath Ekkad,
Srinath Ekkad
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
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Yong Kim,
Yong Kim
Solar Turbines
, Incorporated, San Diego
, CA 92101
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Partha Dutta,
Partha Dutta
Solar Turbines
, Incorporated, San Diego
, CA 92101
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Hee-Koo Moon,
Hee-Koo Moon
Solar Turbines
, Incorporated, San Diego
, CA 92101
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Ram Srinivasan
Ram Srinivasan
Solar Turbines
, Incorporated, San Diego
, CA 92101
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Sunil Patil
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
Teddy Sedalor
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
Danesh Tafti
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
Srinath Ekkad
Mechanical Engineering Department,
Virginia Polytechnic Institute and State University
, Blacksburg
, VA 24061
Yong Kim
Solar Turbines
, Incorporated, San Diego
, CA 92101
Partha Dutta
Solar Turbines
, Incorporated, San Diego
, CA 92101
Hee-Koo Moon
Solar Turbines
, Incorporated, San Diego
, CA 92101
Ram Srinivasan
Solar Turbines
, Incorporated, San Diego
, CA 92101J. Thermal Sci. Eng. Appl. Sep 2011, 3(3): 031010 (8 pages)
Published Online: August 12, 2011
Article history
Received:
November 3, 2010
Revised:
April 26, 2011
Online:
August 12, 2011
Published:
August 12, 2011
Citation
Patil , S., Sedalor , T., Tafti , D., Ekkad, S., Kim , Y., Dutta , P., Moon , H., and Srinivasan, R. (August 12, 2011). "Study of Flow and Convective Heat Transfer in a Simulated Scaled Up Low Emission Annular Combustor." ASME. J. Thermal Sci. Eng. Appl. September 2011; 3(3): 031010. https://doi.org/10.1115/1.4004531
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