Short Response Measurement Methods for the Determination of the Velocity and Temperature Fluctuations in High-Temperature Flows.

An optical device using an infrared simultaneous emission and absorption method for measurements of instantaneous gas temperatures, as well as total pressure probes with a short response time in order to measure the turbulence level have been developed to characterize the unsteadiness of high-temperature flows. These two experimental techniques are described and the results obtained with hot turbulent flows are analyzed and compared with more classical indications given by laser velocimetry. Additional application of these techniques to obtain the turbulence spectra and to determine the integral scale by the optical method of crossed beams is also examined.