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Title: Detailed measurements of local heat transfer coefficient in the entrance to normal and inclined film cooling holes

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.

Authors:
; ; ; ;  [1];  [2]
  1. Univ. of Oxford (United Kingdom). Dept. of Engineering Science
  2. Rolls Royce, Bristol (United Kingdom)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
250814
Report Number(s):
CONF-940626-
Journal ID: JOTUEI; ISSN 0889-504X; TRN: IM9629%%127
Resource Type:
Journal Article
Journal Name:
Journal of Turbomachinery
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Conference: 39. international gas turbine and aeroengine congress and exposition, The Hague (Netherlands), 13-16 Jun 1994; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; TURBINE BLADES; FILM COOLING; HEAT TRANSFER; LIQUID CRYSTALS; TURBULENT FLOW

Citation Formats

Gillespie, D R.H., Byerley, A R, Ireland, P T, Wang, Z, Jones, T V, and Kohler, S T. Detailed measurements of local heat transfer coefficient in the entrance to normal and inclined film cooling holes. United States: N. p., 1996. Web. doi:10.1115/1.2836638.
Gillespie, D R.H., Byerley, A R, Ireland, P T, Wang, Z, Jones, T V, & Kohler, S T. Detailed measurements of local heat transfer coefficient in the entrance to normal and inclined film cooling holes. United States. https://doi.org/10.1115/1.2836638
Gillespie, D R.H., Byerley, A R, Ireland, P T, Wang, Z, Jones, T V, and Kohler, S T. 1996. "Detailed measurements of local heat transfer coefficient in the entrance to normal and inclined film cooling holes". United States. https://doi.org/10.1115/1.2836638.
@article{osti_250814,
title = {Detailed measurements of local heat transfer coefficient in the entrance to normal and inclined film cooling holes},
author = {Gillespie, D R.H. and Byerley, A R and Ireland, P T and Wang, Z and Jones, T V and Kohler, S T},
abstractNote = {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.},
doi = {10.1115/1.2836638},
url = {https://www.osti.gov/biblio/250814}, journal = {Journal of Turbomachinery},
number = 2,
volume = 118,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1996},
month = {Mon Apr 01 00:00:00 EST 1996}
}