Date of Award

3-2023

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

James L. Rutledge, PhD

Abstract

Film cooling experimentation traditionally reports on the cooling performance of specialty-crafted cooling holes at various angles and array patterns. This is repeated across a variety of model geometries in an effort to provide as much information to the turbine blade designer. While this extensive database of cooling performance is helpful, its true value is found in the designer’s ability to effectively superpose the results on top of each other. One technique for predicting the performance of multiple coolant sources is film cooling superposition theory. This analytical model was employed classically by characterizing the adiabatic effectiveness across a model’s surface; however, adiabatic effectiveness neglects internal cooling effects. The present work seeks to renew film cooling superposition theory such that the actual surface temperature distribution across a model can be effectively calculated: a theory that properly characterizes the effects of internal and external cooling alike. The results show that it is possible to superpose overall effectiveness results from running each plenum independently and develop a more complete prediction of the cooling configuration’s performance.

AFIT Designator

AFIT-ENY-MS-23-M-276

Comments

A 12-month embargo was observed.

Approved for public release. Case number on file.

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