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research-article

MODELING DEPOSITION IN TURBINE COOLING PASSAGES WITH TEMPERATURE DEPENDENT ADHESION AND MESH MORPHING

[+] Author and Article Information
Christopher Bowen

Aerospace Research Center, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43235
bowen.250@osu.edu

Nathan Libertowski

Aerospace Research Center, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43235
libertowski.1@buckeyemail.osu.edu

Mehdi Mortazavi

Aerospace Research Center, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43235
mehdi1608@gmail.com

Dr. Jeffrey Bons

Aerospace Research Center, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43235
bons.2@osu.edu

1Corresponding author.

ASME doi:10.1115/1.4042287 History: Received August 23, 2018; Revised December 13, 2018

Abstract

The role of temperature on deposition in gas turbine internal cooling geometries is investigated. Single impingement cones are developed by an oversized (6 mm) impinging jet over a range of temperatures and flow velocities using 0-5 µm ARD. Cone size was found to increase with increasing temperature and decrease with increasing velocity. Capture efficiency and cone angle ef- fects are presented, and packing factor data is used as a metric to determine if the contact area (Acont ) for adhesion explains the trends seen with temperature. It is systematically demonstrated that the surface free energy (?) is likely a first order function of temperature in internal deposition for the range of temperatures investigated. Candidate physical mechanisms that may cause in- creased adhesive force at elevated temperatures are identified. Temperature dependent adhesion is added to the OSU Deposition Model which is then used with a simplified morphing approach to match temperature induced blockage patterns in a vane leading edge cooling experiment. This process is improved upon using a full mesh morphing routine and matching two of the experimental deposition cones at varied flow temperatures. The added fidelity that mesh morphing affords is demonstrated.

Copyright (c) 2018 by ASME
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