Dispersion of a Plain Jet Spray of Kerosene in an Annular Swirling Air Flow at Elevated Temperature and Pressure

Abstract

Abstract The dispersion, evaporation, and the representative diameters of an evaporating kerosene Jet A-1 spray in an annular flow of swirling air were investigated experimentally. The liquid fuel was injected radially into the annulus by means of a system comprising a single plain jet nozzle of D=0.457mm and a filmer ring positioned at a radial distance of 3mm and extending 5mm past the fuel nozzle in the axial direction. Co-swirling as well as counter-swirling annular air flows were employed. The swirl angles were approximately 29°. The air flow was measured by Laser-Doppler-Anemometry (LDA). Measurement techniques applied to the 2-phase flow included spray visualization by Mie-scattering laser light sheets and quantitative measurements by Phase-Doppler-Anemometry (PDA). Test conditions were Tair=750K, pair=6bar and 12bar, with a nominal total air velocity of 114m/s at the point of fuel injection. PDA measurements were also conducted at the corresponding cold test conditions in terms of air density. The fuel to air momentum flux ratio was constant at q=4.6 except for some supplementary tests.