Influence of Turbulent Gaseous Jet Configuration on Entrainment – Experimental Study

Abstract

Recently published studies report on significant Particulate Matter (PM) formation, comprising organic carbon aerosols, in hydrogen- and hydrogen-rich reformate-fed Internal Combustion Engines. There is a lack of the knowledge about the hollow- cone jet entrainment characteristics at different stages of the jet development, jet interaction with a lubricated cylinder wall, and the entrainment characteristics comparison with the round-jet. The method of shadowgraphy imaging accompanied by the smoke-wire visualization of the ambient entrainment by the jet is suggested and employed for the first time for entrainment and jet structure investigation. We show that the hollow-cone jets exhibit different vapor front entrainment behavior, compared to the round jet. In contrast to the round jet. The phenomenon of a twofold impact of the leading vortex on the farfield ambient with repulsing the ambient downstream the leading vortex and pulling it toward the trail-jet region upstream the vortex is found in the hollow-cone jets after the collapsing. We demonstrate that in contrast to the round jet, the hollow-cone one entrains the ambient in the near field through the inner TNTI.