ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
The numerical analysis of spray formation for GDI system using dynamically coupled internal nozzle flow and ELSA spray simulation
The numerical simulation has been carried out to assess the spray formation characteristics for the gasoline direct injection (GDI) - Spray G injector using a dynamically coupled approach of the internal nozzle flow and the Eulerian Lagrangian Spray Atomization (ELSA) method. The Spray G injector geometry details are adopted from the Engine Combustion Network (ECN). The ELSA model uses the Eulerian framework for the near nozzle region and the Lagrangian framework for the dilute region of the spray. In this analysis, the internal nozzle flow is dynamically coupled with external spray formation to capture the essence of the needle lift and internal nozzle effects. The RNG k-ε turbulence model is used to account for the turbulence effects. The isooctane fuel is used as the surrogate for gasoline fuel, and the results obtained are validated with experimental data obtained through ECN. A reasonable agreement has been achieved with the simulation predictions. Alternative fuels such as methanol and ethanol are used for this analysis to compare the spray formation characteristics with isooctane fuel.