Title page for ETD etd-04292010-232619


Type of Document Master's Thesis
Author Sedalor, Teddy
Author's Email Address sedatedd@vt.edu,sedatedd@gmail.com
URN etd-04292010-232619
Title Heat Transfer and Flow Characteristic Study in a Low Emission Annular Combustor
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Ekkad, Srinath V. Committee Chair
Tafti, Danesh K. Committee Member
West, Robert L. Jr. Committee Member
Keywords
  • dry low emissions
  • infrared thermal imaging
  • swirler
  • combustor liner cooling
Date of Defense 2009-12-07
Availability unrestricted
Abstract
Modern Dry Low Emissions (DLE) combustors are characterized by highly swirling and

expanding flows that makes the convective heat load on the combustor liner gas side difficult to

predict and estimate. A coupled experimental-numerical study of swirling flow and its effects on

combustor liner heat transfer inside a DLE annular combustor model is presented. A simulated

scaled up annular combustor shell was designed with a generic fuel nozzle provided by Solar

Turbines to create the swirl in the flow. The experiment was simulated with a cold flow and

heated walls. An infrared camera was used to obtain the temperature distribution along the liner

wall. Experimentally measured pressure distributions were compared with the heat transfer

results. The experiment was conducted at various Reynolds Numbers to investigate the effect on

the heat transfer peak locations and pressure distributions. A CFD study was performed using

Fluent and turbulence models and used to corroborate and verify the experimental results.

Results show that the heat transfer enhancement in the annulus has slightly different

characteristics for the concave and convex walls. Results also show a much slower drop in heat

transfer coefficient enhancement with increasing Reynolds number compared to can combustors

from a previous study. An introductory study of the effect of a soft wall on the heat transfer on

the combustor liner is also presented.

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