Modeling the Effect of Swirl on Turbulence Intensity and Burn Rate in S.I. Engines and Comparison with Experiment

Investigation of diesel engine performance and emissions by multi-dimensional modeling

“…These properties are calculated on the basis of various atomization models whose characteristics and assumptions are given below. The histories of the computational parcels are obtained from the Lagrangian conservation equations of mass, momentum, and energy in the normal way [18,19]. In atomization model, Huh's model was used as an atomization model in the simulations.…”

Performance Analysis of a Diesel Engine Within a Multi-Dimensional Framework

“…In cold flow studies, generally the simplest standard k- model is widely used [15]. In spray modelling, there are numerous additional models for spray injection, spray breakup, droplet collision, evaporation, wall impingement etc [16,17]. In atomization model, Huh's model was used as an atomization model in the simulations [18].…”

Turbulent Flows in Reciprocating Internal Combustion Engines

“…Using the example of modelling swirl turbulence production, one can develop an appreciation of the role of the integral scale, L, in the dissipation process. In a recent paper, Davis et al 24 developed an heuristic model for the contribution of swirl to the turbulent kinetic energy via the dissipation of the mean angular momentum. In this model the integral scale was assumed to be the same for swirling or non-swirling flows during the intake stroke.…”

“…Using eqns (24), (28) and (29), the initial turbulent diffusivity can now be estimated, and has the following value K~I2L· = 0·024S 2 X rpm/30…”

“…Hence, the initial kinetic energy can be written as (24) In order to solve eqn (18) it is necessary to model L during the intake process. During the intake process, the turbulent jet, which is created at the intake valve by the piston motion, is rolled up into a vortex that fills the space between the intake valve and the piston top.…”