A Binary Gas Composition Sensor to Measure Impermeable Wall Concentration in Film Cooling Experiments PUBLIC ACCESS

[+] Author Affiliations
R. Seffal, S. G. Schwarz, S. J. Walker

Tulane University, New Orleans, LA

Paper No. 92-GT-222, pp. V004T09A019; 7 pages
  • ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Cologne, Germany, June 1–4, 1992
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7896-5
  • Copyright © 1992 by ASME


A binary gas composition sensor has been developed to measure impermeable wall effectiveness with the foreign gas injection technique. The sampled gas is drawn at a controlled flow rate over a platinum hot wire connected to an anemometer circuit. A change in composition of the gas flowing over the wire results in a change in the heat loss to the gas and, hence, the anemometer output voltage. The sensitivity of a prototype sensor with a 6.1 mm platinum hot wire length has been found to be 0.278 V/% helium at a mass concentration of 2% He.

The sensor has been tested in a film cooling experiment in which an air-helium mixture (helium mass concentration 2%) was injected through a slot along a flat surface. A series of sensors placed downstream of the injection slot measured the foreign gas wall concentrations. The effectiveness results deduced from the anemometer output voltages compare very well to those of classical film cooling experiments in the literature.

The use of the binary gas composition sensor in film cooling experiments has the advantage of simulating adiabatic walls without the disadvantages of the inability to reduce the effectiveness data during the film cooling test and the requirement of an expensive gas chromatograph.

Copyright © 1992 by ASME
Topics: Sensors , Film cooling
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