Numerical simulation of the flow field and fuel sprays in an IC engineA two-dimensional model for axisymmetric piston-cylinder configurations is developed to study the flow field in two-stroke direct-injection Diesel engines under motored conditions. The model accounts for turbulence by a two-equation model for the turbulence kinetic energy and its rate of dissipation. A discrete droplet model is used to simulate the fuel spray, and the effects of the gas phase turbulence on the droplets is considered. It is shown that a fluctuating velocity can be added to the mean droplet velocity every time step if the step is small enough. Good agreement with experimental data is found for a range of ambient pressures in Diesel engine-type microenvironments. The effects of the intake swirl angle in the spray penetration, vaporization, and mixing in a uniflow-scavenged two-stroke Diesel engine are analyzed. It is found that the swirl increases the gas phase turbulence levels and the rates of vaporization.
Document ID
19870061477
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nguyen, H. L. (NASA Lewis Research Center Cleveland, OH, United States)
Schock, H. J. (NASA Lewis Research Center Cleveland, OH, United States)
Ramos, J. I. (Carnegie-Mellon University Pittsburgh, PA, United States)
Carpenter, M. H. (NASA Langley Research Center Hampton, VA, United States)
Stegeman, J. D. (Toledo, University OH, United States)