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research-article

Dynamic Similarity in Turbine Deposition Testing and the Role of Pressure

[+] Author and Article Information
Craig Sacco

Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, OH 43235
craigsacco1@gmail.com

Christopher Bowen

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

Ryan Lundgreen

Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, OH 43235
ryanlundgreen@gmail.com

Dr. Jeffrey Bons

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

Eric Ruggiero

GE Aviation, Cincinnati, OH 45215
eric.ruggiero@ge.com

Jason Allen

GE Aviation, Cincinnati, OH 45215
allenj@ge.com

Jeremy Bailey

GE Aviation, Cincinnati, OH 45215
bailey@ge.com

1Corresponding author.

ASME doi:10.1115/1.4038550 History: Received August 23, 2017; Revised September 23, 2017

Abstract

The role of absolute pressure in deposition testing is reviewed from first principles. Relevant dimensionless parameters for deposition testing are developed and dynamic similarity conditions are assessed in detail. Criteria for establishing appropriate conditions for laboratory studies of deposition are established pursuant to the similarity variables. The role of pressure is particularly singled out for consideration relative to other variables such as temperature, particle size, and test article geometry/scaling. A case study is presented for deposition in a generic array of impinging jets. A fixed quantity (2g) of 0-10micron Arizona Road Dust (ARD) is delivered to the impingement array at three different temperatures (290, 500, and 725K) and at fixed pressure ratio. Deposition results are presented for operating pressures from 1 to 15atm. Surface scans show that the height of deposit cones at the impingement sites decreases with increasing pressure at constant temperature and pressure ratio. This reduction is explained by the lower "effective" Stokes number that occurs at high particle Reynolds numbers, yielding fewer particle impacts at high pressure. A companion CFD study identifies the additional role of Reynolds number in both the impingement hole losses as well as the shear layer thickness.

Copyright (c) 2017 by ASME
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