Effects of Interjet Spacing on Burning Multiple Sprays

The physico-chemical processes, in terms of size, shape, atomization, evaporation, and burning characteristics of multiple spray flames, depend on the mutual interaction of individual jets and the effects of surrounding airstream. In the present study three configurations, namely, 1-jet, 2-jets, and 3-jets arranged in a line, were used. Jet-A fuel was the liquid. Identical twin-fluid air-assist atomizers were employed. Four interjet spacings, a/d = 18.5, 24.7, 30.9, and 37, where a was the distance between the jets and d was the atomizer exit diameter, were employed to study the effects of interjet spacing. Measurements included flame length, flame merging length, flame liftoff height, droplet size distribution, flame temperature, and major species concentrations. The transverse profiles in the near-nozzle region and the far-burner regions are presented. With an increase in interjet spacing, the amount of oxygen penetration through the space between the jets increases and leads to higher far-burner temperature, lower soot emission, and higher production of carbon monoxide and nitrogen oxides. (Author)