CORRECTION OF TEMPERATURE-FLUCTUATION MEASUREMENTS USING COLD WIRES

Lecordier, jc dupont, a gajan, p paranthoen, pIt has been shown previously that the frequency response of cold wires used to measure a turbulent temperature field can be noticeably attenuated because of thermal inertia of the wire, end conduction heat loss between wire and prongs, and spatial resolution. The correction of temperature signals is, therefore, indispensable. The transfer functions of cold wires have been determined by using a home-made dynamic calibration system. A theoretical analysis is used to take into account spatial resolution. The proposed method of correction for temperature fluctuation spectra and RMS intensity accounting for these three effects is applied to the determination of temperature variance profile in the heated wake of a line source in a turbulent boundary layer