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An Experimental Investigation of the Effect of Dimples on Turbine Adiabatic Film Cooling by Isaac Roland

An Experimental Investigation of the Effect of Dimples on Turbine Adiabatic Film Cooling

by Isaac Roland
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Book cover type: Paperback
  • ISBN13: 9781288319107
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Biblioscholar
  • Publisher Imprint: Biblioscholar
  • Publication Date:
  • Pages: 100
  • Original Price: GBP 11.95
  • Language: English
  • Edition: N/A
  • Item Weight: 150 grams
  • BISAC Subject(s): General

This experiment explored the ability of a row of cylindrical dimples' vortex shedding to entrain the cooling film in the boundary layer for longer distances, thus enhancing cooling on a turbine leading edge model. The experiment utilized a semi-cylindrical leading edge followed by an after body with straight surfaces. A foam leading edge drilled with cooling holes allowed for a determination of adiabatic film effectiveness using an Infrared Thermography (IR) technique to measure surface temperature distributions. Two test models were utilized, one with a row of seven dimples placed upstream from the cooling-hole, while the other model had a row of seven downstream. Five blowing ratios were tested: 0.5, 0.75, 1.0, 1.25, and 1.5. It was observed that the dimples introduced disturbances in the boundary layer that encouraged vertical and lateral diffusion of the cooling film that caused reattachment of coolant jet liftoff. Dimples placed upstream of the cooling hole improved spanwise averaged adiabatic film cooling effectiveness by up to 60% for far downstream locations. Dimples placed downstream of the cooling hole enhanced up to 30% for far downstream locations.

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This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

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