Simultaneous measurement of velocity and temperature in high-temperature turbulent flows: a combination of LDV and a three-wire temperature probe

This paper deals with a simple and reliable technique for simultaneous meas urement of velocity and temperature in high-temperature turbulent flows, in cluding combustion. The technique is based on the combination of laser Dopp ler velocimetry and a digitally compensated fine-wire thermocouple. For tem perature measurement, a two-thermocouple probe with a fine cold wire [Tagaw a et al. (1998) Rev Sci Instrum 69: 3370-3378] is used, which enables in si tu measurement of thermocouple time constants and accurate compensation of the thermocouple response. When tested in a turbulent wake behind a heated cylinder, the technique proves to be highly reliable and effective for inve stigating heat transport processes in various non-isothermal turbulent flow s.