TY - JOUR
TI - Characteristics of diffusion flames with accelerated motion
AU - Lou Bo
AU - Qiu Yonghai
AU - Xu Jianhong
JN - Thermal Science
PY - 2016
VL - 20
IS - 6
SP - 2113
EP - 2124
PT - Article
AB - The aim of this work is to present an experiment to study the characteristics  of a laminar diffusion flame under acceleration. A Bunsen burner (nozzle  diameter 8 mm), using liquefied petroleum gas as its fuel, was ignited under  acceleration. The temperature field and the diffusion flame angle of  inclination were visualised with the assistance of the visual display  technology incorporated in MATLAB™. Results show that the 2-d temperature  field under different accelerations matched the variation in average  temperatures: they both experience three variations at different time and  velocity stages. The greater acceleration has a faster change in average  temperature with time, due to the accumulation of combustion heat: the  smaller acceleration has a higher average temperature at the same speed. No  matter what acceleration was used, in time, the flame angle of inclination  increased, but the growth rate decreased until an angle of 90°: this could be  explained by analysis of the force distribution within the flame. It is also  found that, initially, the growth rate of angle with velocity under the  greater acceleration was always smaller than that at lower accelerations; it  was also different in flames with uniform velocity fire conditions.