An experimental and analytical study on spray flow field by liquid/gas coaxial injector elements (I)

The spray flow field formed by flush face concentric tube injector elements was investigated by nonreactive cold liquid gas flow test. An analytical model was derived to predict the spray flow field, including the local atomization rate of the liquid jet, the gas phase velocity decay, liquid mass flux dispersion and the local liquid droplets to gas mixing efficiencies. It was shown that the ratio of the half width of the liquid phase mass flux to that of the gas phase velocity is the critical factor in controlling the mixing efficiencies of the spray flow field; in addition, this critical factor is related to the ratio of the gas to liquid injection velocity.