Droplet velocity measurements in a four-cylinder optical DI diesel engine
Laser Doppler velocimetry (LDV) measurements of fuel spray droplet velocities were obtained in the combustion chamber of an optical direct injection 1.9L diesel engine and compared with spray images obtained with an image-intensified CCD camera. In agreement with previous results under atmospheric conditions, the leading droplets in the spray tip exhibited lower velocity than the following droplets, and droplet velocities decreased rapidly soon after the end of injection. Results confirm that in small direct injection diesel engines, at least under low-load conditions, the spray imposes its own velocity field on the air flow which implies that the pre-injection mean flow and turbulence are of secondary importance in terms of the local mixing during the injection period.
Bibliographic Reference: Paper presented: COMODIA '94, Yokohama (JP), July 11-14, 1994
Availability: Available from (1) as Paper EN 38104 ORA
Record Number: 199410303 / Last updated on: 1994-11-28
Original language: en
Available languages: en