抄録
Diesel spray characteristics are largely governed by the atomization phenomenon. Atomization phenomenon in the computational fluid dynamics (CFD) may be described using a breakup model. Previously, diesel spray analysis has been done using a breakup model such as Kelvin-Helmholtz and Rayleigh-Taylor (KH-RT) model. KH model and RT model are modeled for high Weber number conditions. Even if the fuel is injected with high pressure, the downstream region of spray is corresponding to relatively low Weber number conditions. To overcome this problem, we develop the KH-MTAB model. This is a hybrid breakup model where the KH model and Modified Taylor Analogy Breakup (MTAB) model are used to model the primary and secondary breakup respectively. MTAB model is more suitable for the description of secondary breakup, compared to RT model. In this report, in order to validate the KH-MTAB model at high density fields, it is calculated in conditions of non-evaporation and evaporation spray. It is found that LES is in good agreement with experimental results such as macroscopic characteristic like penetration, and microscopic characteristic like SMD in non-evaporation spray. Furthermore LES is in good agreement with vapor penetration and liquid penetration in evaporative spray.
