A Multi-Zone Combustion Model integrated with a fast Tabulated-Chemistry Approach applied for the Simulation of HCCI Engines supplied with Hydrogen or Carbon-Based Fuels
2022-01-0459
03/29/2022
- Event
- Content
- To meet the stringent regulation imposed by EU and other legislators, various advanced combustion modes for Internal Combustion Engines (ICEs) are currently under investigation. Among those, Homogeneous Charge Compression Ignition (HCCI) appears a promising solution, simultaneously reducing pollutant emission and enhancing thermal efficiency. In this context, the numerical simulation has evolved into a powerful tool to investigate the combustion modes and to develop optimum control strategies, thanks to its greater flexibility and lower cost, if compared with the experiments. To simulate HCCI and other advanced combustion modes, based on charge stratifications in the combustion chamber, a general multi-zone model has been developed and implemented through user coding into a commercial software (GT-Power™). This model is based on a control mass Lagrangian multi-zone approach and it incorporates a procedure based on an off-line tabulation of chemical kinetics (Tabulated Kinetic of Ignition - TKI). It performs an accurate and fast prediction of the air/fuel mixture auto-ignition, combining the accuracy of detailed chemistry with a lighter computational effort. The tabulated procedure is preliminarily verified against the results of a conventional chemical kinetics solver applied to a constant-volume homogeneous reactor and to and a single-zone engine cycle simulation. Subsequently, the multi-zone model is applied to reproduce experimental data taken from literature in engines burning different fuels (hydrogen, conventional gasoline, n-heptane, and methane), at various temperatures at IVC, air/fuel ratio, and EGR levels. Model accuracy is verified on both experimental pressure traces, rate of heat release, and noxious emissions. The numerical results showed good agreement with literature data without the need for a case-by-case tuning. The methodology proved to be a reliable tool to investigate the operation of a HCCI engine, to be applied in the development of new engine architecture working under this advanced combustion mode.
- Citation
- De Bellis, V., Malfi, E., Fasulo, G., Lanotte, A. et al., "A Multi-Zone Combustion Model integrated with a fast Tabulated-Chemistry Approach applied for the Simulation of HCCI Engines supplied with Hydrogen or Carbon-Based Fuels," SAE Technical Paper 2022-01-0459, 2022, .