Abstract
In this paper, air entrainment into diesel spray was investigated. To visualization of the ambient air flow and measurement of entrainment characteristics, the Laser Induced Fluorescence-Particle Image Velocimetry (LIF-PIV) method was applied to the surrounding air of the spray upstream in a non-evaporative conditions. Also, we investigated the effects of injection pressure on the entrainment characteristics. The results show that the entrainment velocity increases and the tangential velocity decreases as the downstream of the spray. In addition, in the set-off region of the quasi-steady diesel spray, the entrainment velocity and entrainment mass flow rate increase with increasing injection pressure, although the ratio of entrainment mass flow rate to fuel injection rate changes slightly with injection pressure.
