Title page for ETD etd-0328103-091826


Type of Document Dissertation
Author Marques, Christophe
Author's Email Address cmarque@lsu.edu
URN etd-0328103-091826
Title Manufacturing and Analysis of a LIGA Heat Exchanger for the Surface of a Tube: A Cooling Simulation of the Leading Edge Region of a Turbine Blade
Degree Doctor of Philosophy (Ph.D.)
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kevin Kelly Committee Chair
Dimitris Nikitopoulos Committee Member
Michael Murphy Committee Member
Michael Tom Committee Member
Srinath Ekkad Committee Member
Sumanta Acharya Committee Member
Gregory Gusik Dean's Representative
Keywords
  • microfabrication
  • pin fin
  • MEMS
  • LIGA
  • heat exchanger
  • turbine blade cooling
Date of Defense 2003-03-14
Availability unrestricted
Abstract
Fabricating nickel micro heat exchangers directly on planar or non-planar metal surfaces has been demonstrated using the LIGA micromachining process. These heat exchangers can effectively control the temperature of surfaces in high heat flux applications. Of particular interest is the temperature control of gas turbine engine components. The locations in the gas turbine engine where improved, efficient cooling is required includes gas turbine blades, stator vanes, the turbine disk, and the combustor liner. In this dissertation, the primary application of interest is the use of such heat exchangers to cool airfoils such as turbine blades. In the first part of the study, the manufacturing and testing procedures of a flat configuration parallel plate micro pin fin heat exchanger are described. The pin fin array geometry investigated is staggered, with pin diameters of 500 m, height to diameter ratios of 1.0 and spacing to diameter ratios of 2.5. Pressure loss and heat transfer experimental results for 4,000Re20,000 are reported and a Nu-Re correlation is provided. Favorable comparisons with studies on similar pin fin patterns tested at a larger scale are revealed. The flat micro pin fin heat exchanger performance is concluded to always exceed the parallel plate (smooth channel) counterpart by a factor of 1.35 to 1.78 in the Reynolds number range studied. An analytic model based on these experimental results is described and used to make predictions for cooling effectiveness values attaining 0.72 in a gas turbine blade cooling application. In the second part of the study, the feasibility to fabricate a micro pin fin heat exchanger on a simple airfoil, with a leading edge approximated by a cylinder, is demonstrated. The corresponding pin fin array geometry used is in-line, with pin diameters of 200 m, height to diameter ratios of 2.5 and spacing to diameter ratios of 5. Heat transfer tests performed in a high temperature rig at gas Reynolds numbers near 10,000 are reported. Cooling effectiveness values ranging from 0.70 to 0.88 are obtained for coolant to mainstream gas mass ratios from 1% to 4 % and coolant to mainstream gas temperature ratios from 1.62 to 2.26.
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