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Hydrodynamic Measurements Throughout a Flat Plate Multi-Row Film Cooling Array With Inclined Holes

[+] Author Affiliations
Greg Natsui, Michael T. Voet, Zachary Little, Erik Fernandez, Jay Kapat

University of Central Florida, Orlando, FL

Jason E. Dees

General Electric, Niskayuna, NY

Paper No. GT2016-56184, pp. V05CT19A007; 12 pages
doi:10.1115/GT2016-56184
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4980-4
  • Copyright © 2016 by ASME

abstract

Particle image velocimetry and particle scattering measurements are taken over a flat multi-row film cooled surface. The effect of coolant mass flow (characterized by blowing ratio, momentum flux ratio or velocity ratio) is investigated. The array investigated has 8 rows containing 52 holes of 3.8 mm diameter with inclination angles of 20° and hole length-to-diameter ratios of 11.2. The lateral and streamwise pitches are 7.5 times the diameter. The holes are in a staggered arrangement.

PIV measurements are taken with CO2 as coolant injecting into an air primary stream. Two streamwise aligned planes are measured; a centerline plane and a plane spaced laterally half a diameter from centerline. The PIV results provide a quantitative view of the flow over eight rows of injection as well as the recovery region. Images are acquired at 8 Hz and have a spatial resolution of 10.3 interrogation windows per hole diameter. The tunnel has low freestream turbulence (1%) and is low speed, so the primary turbulence production mechanism is shearing. As a result, the M = 0.45 blowing ratio case shows higher levels of turbulent kinetic energy compared with the M = 1.05 blowing ratio case. Uncertainty in the PIV measurements is estimated via the correlation statistics method.

Copyright © 2016 by ASME

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