Several conventional models of spray breakup were implemented into the KIVA-II code, including:
- Taylor Analogy Breakup model (O'Rourke and Amsden, 1987),
- WAVE KH-RT breakup model (Patterson and Reitz, 1998),
- Stochastic breakup model (Gorokhovski and Saveliev, 2003).
These models were originally developed for quasi-steady-state sprays injected at constant or slightly varying velocity.
The current study is focused on analysis of the effect of high injection acceleration on breakup in diesel sprays.
In order to improve predictions of spray penetration at the initial stage of injection, a new semi-phenomenological model of breakup, taking into account injection acceleration, is suggested. The model is developed based on the classical WAVE breakup model suggested by Reitz (1987).
The new model provides an equation for the spray breakup time as a function of jet acceleration. The model has been developed using an assumption that the spray liquid core can be approximated as a solid body. The instantaneous injection velocity was specified, based on the measured rate of injection and taking into account the effect of cavitation.
A customised version of the KIVA II code was validated against in-house experimental observations of highly-transient Diesel sprays
The results of our study are summarised in the paper.