Film cooling performance of a tripod hole anti-vortex geometry is evaluated on cascade vane pressure and suction surfaces with steady-state IR (infrared thermography) technique and compared to a baseline cylindrical hole geometry performance. The base geometry is a simple cylindrical hole design inclined at 30° from the surface with pitch-to-diameter ratio of 3.0. The tripod hole geometry, also called an anti-vortex design, is where two side holes, also of the same diameter, branch out from the root at 15° angle. The pitch-to-diameter ratio between the main holes for this design is 6.0. Two secondary fluids — air and carbon-dioxide — were used to study the effects of coolant-to-mainstream density ratio (DR = 0.95 and 1.45) on film cooling effectiveness. Several blowing ratios in the range 0.5 –4.0 were investigated independently at the two density ratios. Results show that the tripod hole design clearly provides higher film cooling effectiveness the baseline case with overall reduced coolant usage on both pressure and suction side of the airfoil. Additional testing was also conducted to measure the aerodynamic effects of injecting coolant through the cylindrical and tripod hole designs. Results show that the coolant issued from a tripod hole design has a significantly smaller effect on the overall aerodynamic performance of the vane.
- Heat Transfer Division
Performance of Tripod Antivortex Injection Holes on Vane Film Cooling
- Views Icon Views
- Share Icon Share
- Search Site
LeBlanc, C, Narzary, D, Ekkad, S, & Alvin, MA. "Performance of Tripod Antivortex Injection Holes on Vane Film Cooling." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 745-755. ASME. https://doi.org/10.1115/HT2012-58135
Download citation file: