Loading...

Computational study of parameters affecting turbulent flat plate film cooling

Mahjoob, S ; Sharif University of Technology | 2004

143 Viewed
  1. Type of Document: Article
  2. DOI: 10.1115/gt2004-53027
  3. Publisher: American Society of Mechanical Engineers , 2004
  4. Abstract:
  5. Blade film cooling is one of the best methods to improve efficiency of gas turbines. In this work, two different methods of film cooling, namely, slot injection and discrete hole injection have been numerically studied on a flat plate. Incompressible, stationary, viscous, turbulent flow has been simulated using the FLUENT CFD code with the standard k-s model. The study of injection angle and velocity ratio show that the optimum film cooling in both methods, occurs at the jet angle of 30° but with the velocity ratio of 1.5 for slot case and 0.5 for discrete hole case. The study of jet aspect ratio in discrete hole method, shows that stretching the hole in spanwise direction increases the film cooling effectiveness. Because it not only cool a larger region in both spanwise and streamwise directions, but also can sustain the cooled flow closer to the blade's wall. The study of jet spacing shows that increasing the jet spacing decreases the effectiveness but not as much as jet aspect ration does
  6. Keywords:
  7. Film cooling ; Gas turbines ; Flow (Dynamics) ; Computational fluid dynamics ; Blades ; Turbulence ; Flat plates
  8. Source: 2004 ASME Turbo Expo, Vienna, 14 June 2004 through 17 June 2004 ; Volume 3 , 2004 , Pages 23-32
  9. URL: https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2004/41685/23/363378