Spray collision modelling of immiscible droplets in direct water injection

D. Tsuru, S. Kawauchi, K. Okazaki, H. Tajima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Droplet collision in a diesel spray has been studied through the observations of a binary collision system with two equivalent droplets of the same liquid. Moreover, conventional CFD (Computational Fluid Dynamics) codes only consider the coalescence and the stretching separation of two identical liquid droplets. DWI (Direct Water Injection) system recently introduced to reduce NOx emission from marine diesels, however, could have considerable collisions between the droplets of the different liquid, that is, between water droplets and fuel droplets since it has near co-axial nozzle layout and water is usually injected under much lower pressure than fuel. In this study, the criteria of the collision outcomes between immiscible droplets were newly derived theoretically and implemented into KIVA3 code. These criteria divided bounce, coalescence and reflexive or stretching separation regimes. The effective entrainment of water into fuel spray was numerically captured in the DWI system of the two-needle injector by introducing concentric fuel (inner) and water (outer) sphere after coalescence or reflexive separation. The predictions were partially confirmed through observation of the actual DWI spray in a constant volume bomb.

Original languageEnglish
Title of host publication11th International Annual Conference on Liquid Atomization and Spray Systems 2009, ICLASS 2009
PublisherILASS Americas/Professor Scott Samuelsen UCI Combustion Laboratory University of California Irvine, CA 92697-3550
ISBN (Electronic)9781617826535
Publication statusPublished - 2009
Event11th International Annual Conference on Liquid Atomization and Spray Systems, ICLASS 2009 - Vail, United States
Duration: Jul 26 2009Jul 30 2009

Publication series

Name11th International Annual Conference on Liquid Atomization and Spray Systems 2009, ICLASS 2009

Conference

Conference11th International Annual Conference on Liquid Atomization and Spray Systems, ICLASS 2009
CountryUnited States
CityVail
Period7/26/097/30/09

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

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