PENETRATION AND DISPERSION OF TRANSIENT GAS JETS AND SPRAYS

Results from numerical computations performed to represent the transie nt behavior of axisymmetric non-vaporizing and vaporizing sprays injec ted into a constant volume chamber are presented. These results are co mpared with those from vaporizing spray experiments where, for the sam e mass and momentum flow rates, the effect of chamber density on spray penetration and dispersion angle was studied. It is shown that with t he practical numerical resolution employed here, which appears to be i nadequate, the results do not agree. Higher resolution is impractical from a numerical point of view for sprays. Hence, the present work fur ther explores whether gas jets, which may be computed with a high reso lution, are comparable to the sprays in terms of penetration and dispe rsion angle. For each gas jet computation, the injected mass and momen tum flow rates and the chamber density in the corresponding gas jet co mputations are maintained the same as those in the spray experiments. Comparisons show that the gas jet penetration and angles are in agreem ent with the trends of the spray measurements. In both cases, the pene tration decreases with increasing chamber density and the dispersion a ngle increases.