Characteristics of Methanol and Iso-octane Under Flashing and Non-flashing Conditions in ECN-G Spray
2022-01-0590
03/29/2022
- Event
- Content
- This paper investigated the spray characteristics of methanol under the flash and non-flash boiling conditions defined by the Engine Combustion Network (ECN) Spray G. As a counterpart, the spray features of iso-octane were also simulated and compared to methanol. The Void of Fluid (VOF) approach under the Eulerian scheme was employed to model the internal nozzle flow details, which information was used to initialize the spray parcels and taken as input for the Lagrangian simulations, namely, the one-way coupling method. Since the Eulerian high-fidelity simulations allow capturing the effects of the flow inside the non-symmetrical injector, the rate of injection (ROI) profile, discharge coefficient, and plume angle et al. are not required for the Lagrangian simulations. The simulation results show that the flash boiling led to shorter penetrations and better mixing compared to the non-flash boiling condition. Compared to isooctane, methanol demonstrated a better mixing process owing to its unique physical properties. To calibrate the experimental data, parametric simulations were conducted, and the effects of the turbulence model and spray break-up constants were investigated. The predicted spray penetrations were more sensitive to the turbulence parameters than the spray break-up constants. After spray calibrations, a comparative study of the spray-combustion under a compression ignition condition between methanol and iso-octane was conducted. Compared to iso-octane, methanol resulted in a longer lift-off length but lower soot and NOx emissions.
- Citation
- Moreno Cabezas, K., Liu, X., and Im, H., "Characteristics of Methanol and Iso-octane Under Flashing and Non-flashing Conditions in ECN-G Spray," SAE Technical Paper 2022-01-0590, 2022, .