SPRAY STRUCTURE AND PRIMARY ATOMIZATION CHARACTERISTICS OF LIQUID JETS IN SUPERSONIC CROSSFLOWS

摘要

The breakup processes of liquid jets injected into supersonic crossflows were experimental studied. Various injection pressure, liquid properties, injector diameter and free stream Mach number were used to provide a wide range of jets conditions. Novel developed Particle Field Holography (PFH) technique was firstly used to visualize the detailed spray structure and breakup processes. Results indicate that the aerodynamic forces are the main mechanism leading a liquid jet breakup in supersonic crossflows. The success of experiments verifies that the instable wave grow up on liquid column surface ultimately lead column breakup into ligaments.