An Experimental Investigation on Spray Characteristics Emanating from Liquid-Liquid Coaxial Swirl Atomizer

Liquid fuel/oxidizer atomization is extensively used in rocket engines for exploiting their high mixing efficiency. An experimental investigation is performed to explore the characteristics of sprays produced by a liquid-liquid coaxial swirl atomizer in a non-combusting environment. Investigation data will be used to correlate between liquid properties, atomizer geometric dimension, and atomization spray characterization. The idea is design the atomizer, fabricate, cold flow test and analyze the result. This atomizer is divided into two parts which is the inner atomizer and the outer atomizer. There also has two liquid inlet points where one inlet is meant for inner nozzle while the other inlet is meant for the outer nozzle. Two water supplies of the same kind will be supplied into the atomizer. As compared to basic conventional atomizer design, this atomizer sprays two liquid simultaneously at different angles and different swirl directions, but at the same axis. In this paper, it described the characteristics of spray for outer and inner atomizer. As the result, it was found that the outer atomizer have high value of spray cone angle compared to inner atomizer.