Measurement of Core Structure of Coaxial Jets Under Cold-Flow and Hot-Fire Conditions

Nomenclature C = coefficient in breakup length correlation D = injector diameter, liquid exit diameter unless noted otherwise / transmitted x-ray intensity with absorber present /o = transmitted x-ray intensity with no absorber present L = length of injector passage Lb = intact-liquid-core length or liquid jet breakup length P pressure R = specific gas constant ReD = liquid jet Reynolds number, ptVtD/iit r = injector inlet corner radius t = integrated thickness of x-ray absorber V, v = velocity frei = gas/liquid relative velocity, \vg — vt\ Weg = Weber number based on gas density and gas/liquid relative velocity, pgv^D/a x = axial position in liquid jet measured from injector, or image pixel column location y = image pixel row location