Abstract
The effect of turbulence intensity and fuel vapor pressure on the thermal structure in a linear array of burning droplet streams has been investigated using two levels of turbulence intensity and fuel vapor pressure. Particular attention has been focused on the relationship between the dynamic motion of the flame front and the thermal structure of the flame. Bare microthermocouples, digitally compensated for thermal inertia effects, were used to measure fluctuating gas-phase temperatures in this dilute spray flame with 407 μm nominal diameter hexane droplets. The flame was formed by nine vertical streams oriented in a plane and horizontally separated by a distance of 4 mm. Increasing the vapor pressure of the fuel caused higher flame temperatures at the average location of the premixed-gas flame. However, the essential features of the average and fluctuating temperature profiles as well as the probability density function (pdf) surfaces were unchanged over the range of vapor pressures investigated. The higher-turbulence intensity level promoted higher temperature fluctuations because the fluctuating combustion zone of the flame was widened. The dynamics of the drifting motion of the flame as well as the instantaneous temperature profiles across the flame were also influenced, causing the disappearance of the bimodal shape in the pdf surfaces.
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