A new approach for steady state heat transfer measurements is proposed. Temperature distributions are measured at the surface and a defined depth inside the wall to provide boundary conditions for a three-dimensional heat flux calculation. The practical application of the technique is demonstrated by employing a superposition method to measure heat transfer and film cooling effectiveness downstream of two different 0.75D deep narrow trench geometries and cylindrical holes. Compared to the cylindrical holes, both trench geometries lead to an augmentation of the heat transfer coefficient supposedly caused by the highly turbulent attached cooling film emanating from the trenches. Areas of high heat transfer are visible, where recirculation bubbles or large amounts of coolant are expected. Increasing the density ratio from 1.33 to 1.60 led to a slight reduction of the heat transfer coefficient and an increased cooling effectiveness. Both trenches provide a net heat flux reduction superior to that of cylindrical holes, especially at the highest momentum flux ratios.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5672-7
PROCEEDINGS PAPER
Heat Transfer Measurements Downstream of Trenched Film Cooling Holes Using a Novel Optical Two-Layer Measurement Technique
Peter Schreivogel,
Peter Schreivogel
University of the Federal Armed Forces Munich, Neubiberg, Germany
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Michael Pfitzner
Michael Pfitzner
University of the Federal Armed Forces Munich, Neubiberg, Germany
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Peter Schreivogel
University of the Federal Armed Forces Munich, Neubiberg, Germany
Michael Pfitzner
University of the Federal Armed Forces Munich, Neubiberg, Germany
Paper No:
GT2015-42385, V05BT12A012; 12 pages
Published Online:
August 12, 2015
Citation
Schreivogel, P, & Pfitzner, M. "Heat Transfer Measurements Downstream of Trenched Film Cooling Holes Using a Novel Optical Two-Layer Measurement Technique." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5B: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05BT12A012. ASME. https://doi.org/10.1115/GT2015-42385
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