B104 IGNITION TIMES OF n-DECANE DROPLET ARRAY IN HIGH-TEMPERATURE LOW-SPEED AIRFLOW(Droplet/particle combustion-1)

概要

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The objectives of this study were to measure ignition times of a n-decane droplet array exposed to a high temperature of 925 K and a low-speed airflow up to 10 cm/s, and to observe the ignition event by high-speed photography of OH emission. The experiments, in which initial droplet size, spacing of droplets and airflow velocity were changed, were conducted in a microgravity field to avoid the disturbance of natural convection. The results showed that ignition time of a single droplet took a minimum at a certain airflow velocity and that the droplet array also had a minimum when the airflow velocity and the spacing between droplets were changed. These phenomena can be explained by the competition between the mass transfer rate and the reaction rate. OH emission at ignition always appeared behind the droplets and the propagated to the forward stagnation point of the droplets.
一般社団法人日本機械学会の論文
2000-10-01