Comparative analysis of combustion dynamics using three reaction source models.

The OpenFOAM computational fluid dynamics code was used to investigate the performance of three combustion models, namely, Muppala, Zimont and Algebraic. The performance characteristics of these models were tested in a fully premixed (stoichiometric Φ = 1.0 ) modern, high-performance 4-valve, iso-octane, dual overhead cam (DOHC) engine with quasi-symmetric pent roof combustion chamber running at 1500 revolutions per minute. The performance characteristics of the three combustion models were found to be reasonably representative of measurement data that are usually observed in internal combustion engine test bed experiments. The combined or overall duration Δ θ o , of the flame development Δ θ d and propagation period Δ θ b ′ for the three models were 5.53 ms, 5.69 ms and 6.04 ms for the Muppala, Zimont and Algebraic models, respectively, and these values correspond to 49.75◦CA, 51.175 CA and 54.425 CAwhich are well within the 30 ≤ Δ θ o ≤ 90 acceptable degree crank angle range during typical internal combustion engine operations. The maximum pressure with the corresponding degree crank angle positions at which they occur for the Muppala, Zimont and Algebraic models were found to be: 59.86 b a r , 6.83 ∘ C A , 53.19 b a r , 11.9 ∘ C A and 47.64 b a r , 12.1 ∘ C A respectively. Furthermore, the results from the present study show that the flame-development period Δ θ d , was almost identical for the three combustion models, whereas the rapid-burning interval Δ θ b , was almost indistinguishable for the three combustion models up to about the 80% mark of the regress variable. In specific terms, the complete salient findings from this study are summarised in the conclusion section of this study. [ABSTRACT FROM AUTHOR]