Full Coverage Impingement Heat Transfer at High Temperatures PUBLIC ACCESS

[+] Author Affiliations
R. A. A. Abdul Husain, G. E. Andrews

The University of Leeds, Leeds, UK

Paper No. 90-GT-285, pp. V004T09A032; 13 pages
  • ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Brussels, Belgium, June 11–14, 1990
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7907-8
  • Copyright © 1990 by ASME


Transient cooling techniques were developed for the direct simultaneous measurement of full coverage multi-jet impingement heat transfer coefficient and cooling effectiveness under high temperature combustion convective wall heating conditions. A step change in the impingement coolant flow rate was made and the change in temperature recorded as a function of time, from which the heat transfer coefficient was calculated. A comparison between steady state and transient techniques was also made on a conventional low temperature electrically heated test facility and good agreement was found. There was reasonable agreement between the high temperature heat transfer coefficients and the low temperature results, using similar transient cooling techniques. There was little influence of the coolant to wall temperature ratio on the impingement heat transfer coefficient or the cooling effectiveness obtained from the high temperature test rig. The transient technique was used to study the influence of crossflow in the impingement gap on both the cooling effectiveness and the heat transfer coefficient for a range of low pressure loss impingement walls with an X/D of 1.9–11.

Copyright © 1990 by ASME
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