Title page for ETD etd-05102005-130229


Type of Document Master's Thesis
Author Elder, Erin N.
URN etd-05102005-130229
Title Internal Heat Transfer and External Effectiveness Measurements for a Novel Turbine Blade Cooling Design
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Thole, Karen A. Committee Chair
Dancey, Clinton L. Committee Member
Ng, Wing F. Committee Member
Keywords
  • microcircuit
  • gas turbines
  • heat transfer
  • film cooling
  • internal cooling
Date of Defense 2005-05-05
Availability unrestricted
Abstract
Efficiency and power output of gas turbines improve with an increase in turbine

inlet temperatures, and blade designers continually seek out new methods of increasing

these temperatures. Increases in turbine inlet temperatures are achieved by utilizing a

combination of internal convective cooling and external film-cooling. This study will

evaluate several novel cooling schemes for turbine airfoils, called microcircuits.

Microcircuits are placed inside the turbine blade wall, and the features turbulate the air

and increase heat transfer surface area, thereby augmenting convective cooling. The

coolant flow then exits internal cooling passages to the external side of the blade. Here

the coolant forms a protective layer along the external surface of the blade to protect the

blade from the heated mainstream flow.

In the current study, a low-speed large-scale wind tunnel facility was developed to

measure internal heat transfer coefficients and external adiabatic effectiveness, using

thermal liquid crystallography and infrared thermography. This test facility is unique in

that it can be used to test the effects of internal cooling features on external film cooling.

Results show that the highest augmentations in internal heat transfer were seen at the

lowest Reynolds numbers. Internal features affected the shapes of external film-cooling

contours, but the magnitudes of the spanwise averaged values did not change

significantly with changes in internal geometry.

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