This paper demonstrates a method of calculating the entropy generation rate in an incompressible laminar turbine blade boundary-layer from measurements of surface heat transfer rate. It is shown that the entropy generated by fluid friction in an incompressible blade boundary-layer is significantly less than that generated by heat transfer at engine representative temperature ratios. The centre blade in a low-speed linear cascade is electrically heated and isolated from the airflow with a bypass valve. Upon opening the valve the blade is transiently cooled and thin film heat transfer gauges, painted on machinable glass ceramic inserts mounted into the surface of the blade, are used to record blade surface temperature and surface heat transfer rate signals; local Nusselt numbers are then calculated. Non-dimensional temperature distributions are derived across the boundary-layer using the blade surface heat transfer rate and a similarity condition. The equation describing the local entropy generation per unit volume is then integrated through the boundary-layer at each chordwise measurement point on the blade surface.
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ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
June 2–5, 1997
Orlando, Florida, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7868-2
PROCEEDINGS PAPER
Entropy Generation Measurement in a Laminar Turbine Blade Boundary-Layer
John D. Wallace,
John D. Wallace
University of Limerick, Limerick, Ireland
Search for other works by this author on:
Mark R. D. Davies
Mark R. D. Davies
University of Limerick, Limerick, Ireland
Search for other works by this author on:
John D. Wallace
University of Limerick, Limerick, Ireland
Mark R. D. Davies
University of Limerick, Limerick, Ireland
Paper No:
97-GT-450, V001T03A076; 8 pages
Published Online:
December 24, 2014
Citation
Wallace, JD, & Davies, MRD. "Entropy Generation Measurement in a Laminar Turbine Blade Boundary-Layer." Proceedings of the ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery. Orlando, Florida, USA. June 2–5, 1997. V001T03A076. ASME. https://doi.org/10.1115/97-GT-450
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