Temperature and velocity profiles are measured for cyclohexane, n-heptane, ethyl alcohol and isooctane free, laminar, boundary-layer, sooting, diffusion flames. Temperatures are measured with 3 mil Pt/Pt-13%Rh thermocouples. Corrected gas temperatures are derived by performing an energy balance of convection to and radiation from the thermocouple bead incorporating the variation of air conductivity and platinum emissivity with temperature. Other effects are shown to be negligible. Velocities are measured using laser Doppler Velocimetry techniques. Profiles are compared with previously reported analytic temperature and velocity fields. Comparison of theoretical and experimental temperature profiles suggests improvement is needed in the analytical treatment that accounts for the effects of thermal cracking of the fuel. The velocity profiles are in good agreement, with the departure of theory from observation partially due to the small fluctuations inherent in these free flows.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering