Abstract
Homogeneous Charge Compression Ignition (HCCI) is a promising advanced combustion mode, featured by both high thermal efficiency and low emissions. In this context, a 0D multi-zone model has been developed, where the thermal stratification in the combustion chamber has been taken into account. The model is based on a control mass Lagrangian multi-zone approach. In addition, a procedure based on a tabulated approach (Tabulated Kinetic of Ignition - TKI) has been developed, to perform an accurate and fast prediction of the air/fuel mixture auto-ignition. This methodology allows combining the accuracy of detailed chemistry with a negligible computational effort. The tabulated procedure has been preliminarily verified through the comparison with the results of a commercial software (GT-Power™). In this assessment, single zone simulations have been performed comparing the TKI strategy to a conventional chemical kinetics one, in four different cases at varying the intake temperature and the equivalence ratio. Then, the proposed 0D multi-zone model has been validated against experimental data available in the literature. The analyses are carried out with reference to an HCCI engine fuelled with pure hydrogen and working in a single operating point, namely 1500 rpm, 2.2 bar IMEP and with a fuel/air equivalence ratio of 0.24. Three different temperatures, i.e., 373, 383, and 393 K, have been considered for the intake air. The experimental/numerical comparisons of pressure cycles and burn rates proved that the proposed numerical approach can reproduce the experiments with good accuracy, without the need for case-by-case tuning.
Highlights
In the present-day scenario, the automotive industry is facing a challenging path consisting in the design of low emission and low fuel-consumption vehicles, through the development of innovative Internal Combustion Engine (ICE) architectures
The Homogeneous Charge Compression Ignition (HCCI), as a low-temperature combustion (LTC) concept proposed by Onishi et al [1], represents a reliable technique, able to produce ultra-low NOx levels and to provide greater fuel conversion efficiencies, compared to those of conventional ICEs [2,3,4]
Since the HCCI engines are characterized by the absence of the flame front propagation, the combustion phenomenon is described through the evolution of the mixture composition in the cylinder via a detailed chemical kinetic mechanism [11,12,13]
Summary
In the present-day scenario, the automotive industry is facing a challenging path consisting in the design of low emission and low fuel-consumption vehicles, through the development of innovative Internal Combustion Engine (ICE) architectures. An increasing interest is addressed to innovative combustion modes Among these options, the Homogeneous Charge Compression Ignition (HCCI), as a low-temperature combustion (LTC) concept proposed by Onishi et al [1], represents a reliable technique, able to produce ultra-low NOx levels and to provide greater fuel conversion efficiencies, compared to those of conventional ICEs [2,3,4]. Since the HCCI engines are characterized by the absence of the flame front propagation, the combustion phenomenon is described through the evolution of the mixture composition in the cylinder via a detailed chemical kinetic mechanism [11,12,13] For this reason, the most common HCCI modelling is based on a single zone approach [1416]. The whole procedure is applied to reproduce the experimental data related to an HCCI engine fuelled with hydrogen
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