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Flow visualisation of the external flow from a converging slot-hole film-cooling geometry

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Sargison, JE and Oldfield, MLG and Guo, SM and Lock, GD and Rawlinson, AJ (2005) Flow visualisation of the external flow from a converging slot-hole film-cooling geometry. Experiments in Fluids, 38 (3). pp. 304-318. ISSN 0723-4864

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Abstract

This paper presents flow visualisation experiments
for a novel film-cooling hole, the converging
slot-hole or console for short. Previously published
experimental results have demonstrated that the console
improved both the heat transfer and the aerodynamic
performance of turbine vane and rotor blade cooling
systems. Flow visualisation data for a row of consoles
were compared with that of cylindrical and fan-shaped
holes and a slot at the same inclination angle of 35° to
the surface, on a large-scale, flat-plate model at enginerepresentative
Reynolds numbers in a low speed tunnel
with ambient temperature mainstream flow. In the first
set of experiments, the flow was visualised by using a fine
nylon mesh covered with thermochromic liquid crystals,
allowing the measurement of gas temperature contours
in planes perpendicular to the flow. This data demonstrated
that the console film was similar to a slot film,
and remained thin and attached to the surface for the
coolant-to-mainstream momentum flux ratios of 1.1 to
40 and for a case with no crossflow (infinite momentum
flux ratio). A second set of flow visualisation experiments
using water/dry-ice fog have confirmed these
results and have shown that the flow through all coolant
geometries is unsteady.

Item Type: Article
Journal or Publication Title: Experiments in Fluids
Page Range: pp. 304-318
ISSN: 0723-4864
Identification Number - DOI: 10.1007/s00348-004-0892-1
Additional Information:

The original publication is available at http://www.springerlink.com/content/100416/

Date Deposited: 22 Oct 2007 12:22
Last Modified: 24 Oct 2017 22:04
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