The Effectiveness of Film Cooling With Three-Dimensional Slot Geometries

[+] Author and Article Information
M. N. R. Nina

Department of Mechanical Engineering, Instituto Superior Técnico, Lisbon, Portugal

J. H. Whitelaw

Department of Mechanical Engineering, Imperial College of Science and Technology, London, England

J. Eng. Power 93(4), 425-430 (Oct 01, 1971) (6 pages) doi:10.1115/1.3445602 History: Received December 21, 1970; Online July 14, 2010


The paper describes measurements of adiabatic wall temperature downstream of discrete hole injection slots for a range of parameters relevant to gas turbine practice. The influence of open-area-ratio, slot-lip-length and slot-lip-thickness is determined for tangential holes and a range of mass velocity ratios, 0.3 < m < 2.0, and downstream distances up to 40 equivalent slot heights; similar measurements are reported downstream of three-dimensional splash cooling geometries. In all, 13 different three-dimensional configurations are investigated and permit conclusions to be drawn as to the significance of the parameters investigated. The measurements clearly demonstrate the need for a thin and long slot lip and for a large value of open area ratio.

Copyright © 1971 by ASME
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