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Investigation of Sand Particle Deposition and Erosion Within a Short Pin Fin Array

[+] Author Affiliations
Jonathan B. Cowan, Danesh K. Tafti

Virginia Tech, Blacksburg, VA

Atul Kohli

Pratt & Whitney, East Hartford, CT

Paper No. GT2010-22362, pp. 139-149; 11 pages
doi:10.1115/GT2010-22362
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4399-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

This paper investigates the erosion and deposition characteristics of sand particles in a short pin fin array. The simulation is carried out using a LES solver for the fluid (carrier) phase and a Langragian approach for the particle (dispersed) phase. Three particles Stokes numbers (0.78, 3.1 and 19.5) are explored as well as three non-dimensional particle softening temperatures (θST = 0, 0.37 and 0.67). The deposition is shown to increase with decreasing particle Stokes number from 0.005% for Stp = 19.5 to 13.4% for Stp = 0.78 and is almost completely concentrated on the channel walls (99.6%–100%). The erosion potential is shown to increase with Stokes number and is highest on the pin faces. The deposition increases with decreasing softening temperature from 13.4% at θST = 0.67 to 79% for θST = 0. Overall, the channel walls of the array show the greatest potential for deposition. On the other hand, the pin faces show the greatest potential for erosion.

Copyright © 2010 by ASME

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