Abstract
This paper presents some results of as experimental investigation on the air movement around the injected diesel fuel spray. The single shot fuel spray was injected into a high pressure chamber charged the high pressure and room temperature air. The volume of the chamber is large enough to avoid the influence of the surrounding walls.
The air movement around the injected fuel spray was measured by the“smoke wire”method using highspeed camera and consequently the air entrainment was achieved quantitatively.
The following conclusions can be drawn in this investigation:
(1) The air entrains almost normally into the penetration part of the spray and the air around dillution part is pushed aside by the spray.
(2) The air velocity around the spray decreases as the ambinet pressure increases.
(3) The air velocity becomes slower as the distance from the nozzle tip longer and at the end of penetration part it becomes nearly equal to zero.
(4) The volume of air entraining into the penetration part of the spray is about a half of the apparent spray volume independent on the ambient pressure and time from injection start.
