A fast-response probe for the measurement of total temperature in unsteady or fluctuating compressible flows is discussed. The operation of the device is based on the measurement of transient heat flux at different probe operating temperatures. The heat flux gauges used in the present investigation were thin film platinum resistance thermometers painted onto the stagnation region of hemispherical fused quartz probes. The quartz probes had a diameter of approximately 3 mm. Uncertainty estimates indicate that temperature measurements with an accuracy of better than ±3 K are possible. As a demonstration of the accuracy and utility of the device, total temperature and convective heat transfer coefficient measurements were obtained in a number of supersonic nozzle tests and in a compressible turbulent jet experiment.

Issue Section:
Gas Turbines: Controls and Diagnostics
Topics:
Compressible flow, Probes, Temperature, Heat flux, Quartz, Convection, Gages, Nozzles, Operating temperature, Platinum, Resistance thermometers, Temperature measurement, Thin films, Transients (Dynamics), Turbulence, Uncertainty
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