Date of Award

3-22-2018

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

James L. Rutledge, PhD.

Abstract

Effective film cooling relies on the performance of the selected cooling hole shape and placement of the holes on the surface of the blade. To test each holes effectiveness, large scale, low-temperature testing has been used to reduce cost and complexity. The resulting quantity from this testing is called the adiabatic effectiveness (n). The adiabatic effectiveness can then scaled up to engine operating conditions to predict how the selected film cooling hole will perform. This process is complicated by the nonlinear variation of gas properties between coolant and freestream conditions as well as between the experimental and engine conditions. In this study, various gases were used as coolant to simulate changes in gas properties as one might have between experimental and engine conditions. It was found that when specific heat is included in the form of a new parameter known as the Advective Capacity Ratio (ACR), adiabatic effectiveness results scale well between different cooling gases. Specifically at low momentum flux ratios, use of ACR produced very similar adiabatic effectiveness profiles between all gases.

AFIT Designator

AFIT-ENY-MS-18-M-256

DTIC Accession Number

AD1056571

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