Evaporation And Spreading Of Isooctane Sprays In High Velocity Air Streams

The evaporation and spreading of isooctane sprays were investigated over a range of air-flow and fuel-injection conditions common in ram-jet engines. The fuel was injected contrastream from a simple orifice injector into air flowing through a duct 8 inches in diameter. The measurements were made over the following ranges: air temperatures, 80 degrees to 390 degrees R; air velocities, 100 to 350 feet per second; air static pressures, 18 to 35 inches of mercury absolute; fuel-injection pressure drops, 25 to 85 pounds per square inch; diameters of fuel injector orifice, 0.024 to 0.041 inch; and axial distances from fuel injector, 5 to 18 inches. Over these ranges, expressions were obtained which related the evaporation and spreading of the sprays to the experimental variables.