Title page for ETD etd-06072004-141016


Type of Document Master's Thesis
Author Hebert, Ryan Thomas
Author's Email Address rheber7@lsu.edu
URN etd-06072004-141016
Title Innovative Cooling Configurations for Low Emission Gas Turbine Combustors
Degree Master of Science in Mechanical Engineering (M.S.M.E.)
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Srinath Ekkad Committee Chair
Keith Gonthier Committee Member
Su-Seng Pang Committee Member
Keywords
  • combustor
  • gas turbine
  • heat transfer
  • impingement
Date of Defense 2004-05-14
Availability unrestricted
Abstract
Presently, effective cooling of modern low NOx combustor liners is achieved through combinations of innovative impingement configurations and other heat transfer enhancement methods. An inherent characteristic of conventional impingement configurations is the occurrence of downstream heat transfer degradation due to increased crossflow effects. In the present study, two different impingement configurations are studied. Both impingement configurations examined in this study aim to increase heat transfer effectiveness by reducing the detrimental effects of spent air crossflow. In Part I, a combination technique wherein impingement is combined with ribs placed in between impingement rows is studied. Three configurations with increased rib placements and reduced impingement holes are studied. Each case is compared to a pure impingement configuration for the same jet Reynolds number. In Part II, an innovative impingement configuration, called the zero-crossflow design, is examined. In this design, spent air is directed away from the target surface in an attempt to completely eliminate the detrimental effects of crossflow by reducing its interaction with impingement jets. Three different jet arrays with decreasing numbers of impingement jets are examined in this part of the study. For all test cases, three jet Reynolds numbers (10000, 20000, and 30000) are studied.

Detailed heat transfer distributions are obtained through out the study using a transient liquid crystal technique. Results from Part I show that the presence of ribs increases jet impingement heat transfer along the entire target surface. The crossflow improvements of this combination provide higher heat transfer with reduced cooling air requirements, even though some crossflow degradation is still present. In contrast, the zero-crossflow design of Part II shows minimal heat transfer degradation due to crossflow. This design also displays the ability to produce symmetric heat transfer distributions, which are almost completely independent of the exit flow direction. Finally, the sparse arrays of both parts of the study show more efficient cooling by achieving similar levels of heat transfer with greatly reduced coolant flows.

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