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contributor authorSunil Patil
contributor authorYong Kim
contributor authorPartha Dutta
contributor authorTeddy Sedalor
contributor authorDanesh Tafti
contributor authorHee-Koo Moon
contributor authorRam Srinivasan
contributor authorSrinath Ekkad
date accessioned2017-05-09T00:47:01Z
date available2017-05-09T00:47:01Z
date copyrightSeptember, 2011
date issued2011
identifier issn1948-5085
identifier otherJTSEBV-28833#031010_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147636
description abstractModern 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.
publisherThe American Society of Mechanical Engineers (ASME)
titleStudy of Flow and Convective Heat Transfer in a Simulated Scaled Up Low Emission Annular Combustor
typeJournal Paper
journal volume3
journal issue3
journal titleJournal of Thermal Science and Engineering Applications
identifier doi10.1115/1.4004531
journal fristpage31010
identifier eissn1948-5093
keywordsFlow (Dynamics)
keywordsHeat transfer
keywordsReynolds number
keywordsCombustion chambers
keywordsEmissions
keywordsConvection
keywordsTurbulence AND Heat transfer coefficients
treeJournal of Thermal Science and Engineering Applications:;2011:;volume( 003 ):;issue: 003
contenttypeFulltext


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