Effects of the Operating Variables and Atomization Parameters on Diesel Spray Characteristics by Means of a Transient Evaporative Spray Atomization Model

The objective of the work is to learn about the internal structure of transient evaporative Diesel sprays. A simple atomization model of a non-stationary evaporative spray, described in [1], is used in this paper to study the effects of the operating variables and atomization parameters, of the primary and secondary models, on the Diesel sprays characteristics. The model is a phenomenological and DDM one, and is realized in a PC with C programming language. There are several sub-models included: A primary atomization model of the jet liquid vein based on the jet interface instabilities caused by the aerodynamic action, including an intact length model. A secondary atomization model of droplets break-up based on the Taylor analogy. A droplet evaporation model including the heat-up and the stationary periods, as well as the natural and forced convection effects. A droplet deceleration model based on the aerodynamic forces interaction, in which the air velocity is calculated by means of integrating the acceleration due to the aerodynamic forces. As final result of the model use, penetration and Sauter mean diameter correlations has been obtained.