AI AA-88-0237 Structure and Mixing Properties of Pressure-Atomized Sprays

Effects of Ambient Gas Density on the Structure of Pressure-atomized Sprays

A theoretical and experimental study of the dense-spray region of pressure-atomized nonevaporating sprays is described, emphasizing effects of ambient gas density in the atomization breakup regime. Mean liquid volume fraction distributions were measured for 9.5 mm diameter water jets in still air at pressures of 1-8 atm. Mixing was strongly affected by the gaslliquid density ratio and the degre...

Continuous-phase Properties of the Near-injector Region of Non- Evaporating Pressure-atomized Sprays

Mixing, Transport and Combustion in Sprays

Al~traet--Recent advances concerning analysis of sprays and drop/turbulence interactions are reviewed. Consideration is given to dilute sprays and related dilute dispersed flows, which contain well-defined dispersed-phase elements (e.g. spherical drops) and have dispersed-phase volume fractions less than 1%; and to the near-injector, dense spray region, having irregularly-shaped liquid elements...

Qualitative measurements of pressure-atomized sprays through simultaneous collection of planar fluorescence, phosphorescence, and Mie scattering data

A laser diagnostic technique useful for qualitatively locating and describing regions of vapor and liquid structures of a pressure atomized fuel spray is examined. While Mie scattering is sensitive to the liquid phase within a spray, planar laser-induced fluorescence is sensitive to both the liquid and vapor phases. Hence, a comparison of images utilizing these two techniques could be used to q...

A turbulence-based model for the primary breakup of pressure atomized liquid jets

The primary objective of this study was to investigate and validate a predictive, turbulence based primary breakup model. The ESE model is based on a modeled evolution of the turbulent energy spectrum, and is sufficiently general that it may be applied to a broad range of pressure-atomized spray processes, such as those found in agricultural irrigation, industrial coating, automotive fuel injec...