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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

EFFECT OF FREESTREAM TURBULENCE ON RECOVERY FACTOR OF A CYLINDRICAL TEMPERATURE PROBE

DOI: 10.1615/TFESC1.fnd.013200
pages 945-958

Matthew Stinson
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, MN 55455

Richard J. Goldstein
Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA


KEY WORDS: Temperature Probe, Recovery Factor, Temperature Measurement, High-Speed Flow, Cylinder in Crossflow, Freestream Turbulence, Thermocouple Probe

Abstract

When measuring the fluid temperature in a high-speed flow field, the temperature probe recovery factor must be known in order to deduce the local static and total temperatures in the flow. The probe recovery factor is known to be a function of probe geometry and fluid Prandtl number. Additionally, the probe recovery factor has been shown to vary with Reynolds number and Mach number. However, it is unknown whether the recovery factor varies with freestream turbulence intensity. In this study, the probe recovery factor for a butt-joint thermocouple probe (small cylinder in crossflow) was experimentally determined over a range of freestream turbulence intensities (1% to 6%) for a Mach number of 0:2. Results showed that there was a small, but repeatable, decrease in the probe's recovery factor as the turbulence intensity increased. Failure to properly correct for this effect can lead to significant error in measuring the temperature in a high-speed turbulent flow field.

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