Effects of spacing and arrangement of droplet on combustion characteristics of monodispersed suspended-droplet cluster model under microgravity

Autoignition and early flame behavior of a spherical cluster of 49 monodispersed droplets

“…The closed symbols represent the group flame and the open symbols the individual flames. Global trend of the temporal variation of the burning sphere diameter was almost the same, regardless of the flame appearance at ignition [12]. The burning sphere diameter decreased and then increased at the beginning of the combustion.…”

“…The burning sphere diameter relative to the droplet cluster diameter increased with decreasing the droplet spacing in the middle stage of combustion. The burning sphere diameters for the clusters with much smaller droplet spacing would approach the flame diameter of a single droplet with the same volume as the total droplets in the cluster [12]. The head of the broken arrow for each droplet spacing data set in Fig.…”

“…In the present study, on the other hand, effects of droplet spacing and size on combustion of the autoignited droplet clusters were examined following the first experimental study on effects of droplet number, spacing and arrangement ( [12] in paper). The droplets were mono-disperse, and each droplet was spatially fixed for sustaining the cluster configuration and the uniform droplet spacing until the end of combustion.…”

“…The monodispersed suspendeddroplet cluster (MSDC) model with which arrangement, spacing and initial diameter of the droplet are well-controlled has been developed. 1540 In the first phase of the experimental study [12], effects of the arrangement and the spacing on combustion characteristics of the droplet clusters which autoignite and burn in a high-temperature air were examined. The initial diameter of each droplet was kept constant.…”

A Hydrocarbon Droplet Evaporating in Turbulent Environment at Elevated Ambient Pressure and Temperature

“…That is, spray may be assumed as an ensemble of droplets and, hence, its understanding could be achieved through knowledge gained from the examination of a single droplet. That is why most published work on spray combustion was performed on a single droplet (e.g., Abramzon and Sirignano, 1989;Birouk and Fabbro, 2013;Faeth, 1983;Law, 1982;Sirignano, 1983;Yan and Aggarwal, 2006) or an array of droplets to account for their interactions (e.g., Chauveau et al, 2011;Cho et al, 2009;Dwyer et al, 2000;Imaoka and Sirignano, 2005;Lee et al, 2010;Lefebvre, 1989;Segawa et al, 2005;Umemura et al, 1981, Wu and Sirignano, 2011a, 2011bZoby et al, 2011;and references cited therein). However, although the idealized "single droplet" case study may not be able to replicate the more complex spray phenomenon, it is still capable of revealing useful knowledge that can help advance our understanding of two-phase combustion.…”