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
- gas turbines
- heat transfer
- film cooling
- internal cooling
Date of Defense 2005-05-05 Availability unrestricted AbstractEfficiency 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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