A numerical investigation of gas flow effects on high-pressure gas atomization due to melt tip geometry variation

摘要: A parametric numerical study is presented on how melt feed tube geometry influences the gas flow field of a high-pressure atomizer (HPGA). The axisymmetric, turbulent, compressible Navier-Stokes equations are solved for gas-only in vicinity tip confined-feed, annular-slit atomizer. results indicate that fully retracted can develop high overambient base pressure over wide range operating pressures, while an extended subambient pressure, called aspirating effect, which encourages to flow. Adding taper angle decreases effect. However, radial gradient along its forces move radially outward into high-shear region flow, thus encouraging droplet formation. develops highest such force, but this tends decrease magnitude with extension. Hence, compromise must be established whereby good aspiration character longer balanced against pressure-driving force shorter tip. provide details and effects due variation