A CFD Investigation of Different Port Runner in a GDI Engine.

In this paper computational modeling was conducted on a single cylinder four valve pent-roof spark ignition (SI) engine at a speed of 1000rpm. The model was validated against experimental data available in the literature. To study the effect of intake port configuration two designs of ports were incorporated into the intake of base model. The parameter of SI engine at cold start condition by motoring revealed the betterment of engine performance for different port runner configuration. The turbulence character of average temporal fluctuation velocity along the cylinder axis of an engine is high for model-2. It is more around 54% than other models. The forward tumble is 1.73 for model-2. This ratio is higher than model-1 and model-3 by 2.9% and 90.17% respectively whereas cross tumble is 55.56% and 33.33%. Now the model-3 has maximum positive swirl than the other models with 16.67% and 33.33% for model-1 and model-2 respectively in which negative direction has attain maximum value at model-1 than model-2 and model-3 as 6.25% and 82.5%. The strength of vortices is defined by its length scale of turbulence parameter. The model-2 has 16.05% and 22.9% higher length scale strength than other models. Also it has maximum kinetic energy and dissipation rate at around 66% and 83% than other two models. Model-2 has better than other models for good preparation of mixture and combustion to meet out recent norms and regulation which gets greener engine. [ABSTRACT FROM AUTHOR]