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A converging slot-hole film-cooling geometry - Part 1: Low-speed flat-plate heat transfer and loss

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Sargison, JE and Guo, SM and Oldfield, MLG and Lock, GD (2002) A converging slot-hole film-cooling geometry - Part 1: Low-speed flat-plate heat transfer and loss. Transactions of the ASME: Journal of Turbomachinery, 124 (3). pp. 453-460. ISSN 0889504x

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Abstract

This paper presents experimental measurements of the performance of a new film cooling hole geometry - the Converging Slot-Hole or Console. This novel, patented geometry has been designed to improve the heat transfer and aerodynamic loss performance of turbine vane and rotor blade cooling systems. The physical principles embodied in the new hole design are described, and a typical example of the console geometry is presented. The cooling performance of a single row of consoles was compared experimentally with that of typical 35° cylindrical and fan-shaped holes and a slot, on a large-scale, flat-plate model at engine representative Reynolds numbers in a low speed tunnel with ambient temperature main flow. The hole throat area per unit width is matched for all four hole geometries. By independently varying the temperature of the heated coolant and the heat flux from an electrically heated, thermally insulated, constant heat flux surface, both the heat transfer coefficient and the adiabatic cooling effectiveness were deduced from digital photographs of the colour play of narrowband thermochromic liquid crystals on the model surface. A comparative measurement of the aerodynamic losses associated with each of the four film-cooling geometries was made by traversing the boundary layer at the downstream end of the flat plate. The promising heat transfer and aerodynamic performance of the console geometry have justified further experiments on an engine representative nozzle guide vane in a transonic annular cascade presented in Part 2 of this paper [1].

Item Type: Article
Journal or Publication Title: Transactions of the ASME: Journal of Turbomachinery
Page Range: pp. 453-460
ISSN: 0889504x
Identification Number - DOI: 10.1115/1.1459735
Date Deposited: 28 Oct 2007 21:55
Last Modified: 18 Nov 2014 03:24
URI: http://eprints.utas.edu.au/id/eprint/2308
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