Numerical modelling of fuel spray formation and collapse from multi-hole injectors under flash-boiling conditions

Numerical Modelling and Optimization of the Mixture Formation Process by Multi-Hole Injectors in a GDI Engine

CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

This work consists of studying the effect of needle motion of typical single-hole injectors on spray characteristics. Three-dimensional moving mesh simulations have been carried out to calculate the injection process of cylindrical and conical geometries. The CFD analysis includes a numerical model which simulates the effect of cavitation. Results show that the flow within the nozzle and at the...

Numerical Simulation of Unsteady Nozzle Flow and Spray Formation under Diesel Engine Conditions

In this paper a numerical approach for the prediction of the unsteady atomization process of liquid fuel in Diesel engine is presented. The dependences between the transient nozzle flow and spray formation are analysed. For that purpose models to simulate unsteady nozzle flows including the transient behaviour of cavitation and two-phase atomization process are employed. Results of transient fl...

String cavitation formation inside fuel injectors

The formation of vortex or ‘string’ cavitation has been visualised at pressures up to 2000 bar in an automotive-sized optical diesel fuel injector nozzle. The multi-hole nozzle geometry studied allowed observation of the hole-to-hole vortex interaction and, in particular, that of a bridging vortex in the sac region between the holes. Above a threshold Reynolds number, their formation and appear...

Numerical Simulation of Flash Boiling Effect in a 3-Dimensional Chamber Using CFD Techniques

 Flash Boiling atomization is one of the most effective means of generating a fine and narrow-dispersed spray. Unless its complexity its potential has not been fully realized. In This Paper, a three dimensional chamber has been modeled with a straight fuel injector. Effect of Flash Boiling has been investigated by computational fluid dynamics (CFD) techniques. A finite volume approach with the ...