Date of Award

3-2024

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

James L. Rutledge, PhD

Abstract

The desire for more powerful engines drives higher turbine inlet temperatures and a greater need to cool them. Experimentalists attempt to match cooling effectiveness between two conditions by matching several non-dimensional parameters, one of which is the coolant warming factor. The first investigation of this study examines the effect of the internal Reynolds number and the advective capacity ratio on the coolant warming factor by making use of a computational model and four different gases. It indicates the non-negligible and opposing effects of external convection and solid conduction on the coolant warming factor at matched internal Reynolds number and advective capacity ratio. The influence of the internal Reynolds number and advective capacity ratio on the coolant warming factor prompted a second investigation into their effects on overall cooling effectiveness. This investigation examined the relative importance of matching freestream and coolant Reynolds numbers alongside advective capacity ratio on overall effectiveness. It found contradictory results indicating both the freestream and coolant Reynolds numbers are more important than the other.

AFIT Designator

AFIT-ENY-MS-24-M-187

Comments

A 12-month embargo was observed for posting this work on AFIT Scholar.

Distribution Statement A, Approved for Public Release. PA case number on file.

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