Modelling of spray characteristics from multi-hole injectors for direct-injection gasoline engines

S. Tonini, M. Gavaises, C. Arcoumanis, G. E. Cossali, M. Marengo

Research output: Contribution to conferencePaper

Abstract

Gasoline sprays from high-pressure multi-hole nozzles for direct injection spark-ignition engines have been simulated using a CFD spray model. Model validation takes place against experimental data available for injection into a constant volume chamber. These include CCD spray images and droplet velocity and diameter measurements obtained with a two-component phase Doppler anemometry (PDA) system at injection pressures up to 200bar and chamber pressures varying from atmospheric to 12bar. An 1-D FIE (Fuel Injection Equipment) hydraulic flow simulation provides the injection rate, while a 3-D and two-phase CFD nozzle flow model predicts the injection velocity increase due to cavitation. Finally, a cavitation-induced atomisation model predicts the droplet size distribution very near the nozzle exit. The subsequent spray development is predicted using the Eulerian-Lagrangian methodology, including for liquid droplet aerodynamic break-up, turbulent dispersion, droplet vaporisation and droplet-to-droplet interaction. Overall, both model predictions and measurements confirmed the advantages of high-pressure multi-hole injectors for gasoline direct-injection engines relative to swirl pressure atomisers, in terms of spray structure independency from chamber thermodynamic and injection operating conditions.

Original languageEnglish
Publication statusPublished - 1 Dec 2006
Event10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan
Duration: 27 Aug 20061 Sep 2006

Conference

Conference10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
CountryJapan
CityKyoto
Period27/08/061/09/06

Keywords

  • Multi-hole injector
  • Multi-phase flow modelling
  • Spray guided direct-injection gasoline engines

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    Tonini, S., Gavaises, M., Arcoumanis, C., Cossali, G. E., & Marengo, M. (2006). Modelling of spray characteristics from multi-hole injectors for direct-injection gasoline engines. Paper presented at 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006, Kyoto, Japan.