Time-Resolved LDV and CARS Measurements in a Premixed Reacting Flow

Abstract

We demonstrated the feasibility of making time-resolution measurements of velocity and temperature at the same points in space using remote transmission and reception of laser-probes. The measurements were made of the turbulent premixed reacting flow around a bluff body. The maximum allowable repetition rate of laser shots for temperature determination was 25 Hz. We found that the ratio of the time averaged velocity and temperature, U/T depended strongly on the relative intensity of temperature fluctuation, X. The ratio of Favre to Reynolds averages of the mainstream velocity, U/U as well as UT/O&T characteristic of the heat transfer, slightly correlated with X but was close to unity. Any relationship between the temperature and velocity fluctuations was not found. Within the limits of the present date, it is suggested that the temperature fluctuation played a dominant role in the turbulent reacting flow. We considered that time-varying parts of velocity were secondary in the turbulence and combustion interaction.