An Improved Aspirating Probe for Total-Temperature and Total-Pressure Measurements in Compressor Flows PUBLIC ACCESS

[+] Author Affiliations
Dale E. Van Zante, Theodore H. Okiishi

Iowa State University, Ames, IA

Kenneth L. Suder, Anthony J. Strazisar

NASA Lewis Research Center, Cleveland, OH

Paper No. 94-GT-222, pp. V001T01A081; 9 pages
  • ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • The Hague, Netherlands, June 13–16, 1994
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7883-5
  • Copyright © 1994 by ASME


The aspirating probe originally designed by Epstein and Ng at MIT was modified by replacing the two platinum coated tungsten hot wires normally used with platinum iridium alloy wires. The resulting improved unsteady total pressure and total temperature resolution of the modified probe is demonstrated. Flowfield measurements were made downstream of NASA Rotor 37 for a part speed operating condition to test the performance of the probe. Time resolved blade-to-blade total temperature and total pressure as calculated from the two platinum iridium hot wire voltages are shown. The flowfield measurements are compared with independent measurements of total pressure with high response transducers and total temperature calculated from laser anemometer measurements. Limitations of a more often used unsteady temperature data reduction method which involves only one aspirating probe hot wire voltage and a high-response pressure measurement are discussed.

Copyright © 1994 by ASME
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