JET INTERACTION IN LIQUID-LIQUID COAXIAL INJECTORS

Interaction between two conical sheets of liquid formed by a coaxial s wirl injector has been studied using water in the annular orifice and potassium permanganate solution in the inner orifice. Experiments usin g photographic techniques have been conducted to study the influence o f the inner jet on outer conical sheet spray characteristics such as s pray cone angle and break-up length. The core spray has a strong influ ence on the outer sheet when the pressure drop in the latter is low. T his is attributed to the pressure variations caused by ejector effects . This paper also discusses the merging and separation behavior of the liquid sheets which exhibits hysteresis effect while injector pressur e drop is varied.