Detailed Measurements of Local Heat Transfer Coefficient in the Entrance to Normal and Inclined Film Cooling Holes
- 1 April 1996
- journal article
- Published by ASME International in Journal of Turbomachinery
- Vol. 118 (2), 285-290
- https://doi.org/10.1115/1.2836638
Abstract
The local heat transfer inside the entrance to large-scale models of film cooling holes has been measured using the transient heat transfer technique. The method employs temperature-sensitive liquid crystals to measure the surface temperature of large-scale perspex models. Full distributions of local Nusselt number were calculated based on the cooling passage centerline gas temperature ahead of the cooling hole. The circumferentially averaged Nusselt number was also calculated based on the local mixed bulk driving gas temperature to aid interpretation of the results, and to broaden the potential application of the data. Data are presented for a single film cooling hole inclined at 90 and 150 deg to the coolant duct wall. Both holes exhibited entry length heat transfer levels that were significantly lower than those predicted by entry length data in the presence of crossflow. The reasons for the comparative reduction are discussed in terms of the interpreted flow field.Keywords
This publication has 4 references indexed in Scilit:
- An Advanced Method of Processing Liquid Crystal Video Signals From Transient Heat Transfer ExperimentsJournal of Turbomachinery, 1995
- Heat Transfer Enhancement Within a Turbine Blade Cooling Passage Using Ribs and Combinations of Ribs With Film Cooling HolesPublished by ASME International ,1994
- Internal Cooling Passage Heat Transfer Near the Entrance to a Film Cooling Hole: Experimental and Computational ResultsPublished by ASME International ,1992
- Detailed Heat Transfer Measurements Near and Within the Entrance of a Film Cooling HolePublished by ASME International ,1988