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ARTICLE INFO In this paper, the influence of the equivalence ratio on combustion characteristics has been examined by considering 16 different operating conditions. The fuel used in this research is gasoline and the ignition takes place in two stages. The first stage of combustion is due to low-temperature reaction heat release (LTRHR), and the sec...
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... this point, as it has shown with increasing equivalence ratio the maximum rate of n-heptane has happened later which has caused some issues in predicting the effect of equivalence ratio on LTRHR. The impact of equivalence ratio on the values of Pmax and crank angle related to Pmax for all 16 operating conditions are inspected which is illustrated in Figure 11. For both simulating and experimental results, with increasing equivalence ratio the maximum value of Pmax increases, and also the moment of occurrence of Pmax happen in advance. ...
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Dedicated in-cylinder reforming where gasoline fuel is injected directly into a rich mixture can control the combustion of gasoline engines. This work investigates the effects of injection parameters and in-cylinder fuel reforming on a gasoline direction injection (GDI) e...
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... Using these software packages, the complexities of fluid flow inside the combustion chamber can be analyzed by considering chemical kinetics. However, these software packages, require high time costs despite their high accuracy (Yousefzadeh and Jahanian, 2017;Rabeti et al., 2021a). In this study, the 3D-CFD simulations were performed using the AVL FIRE commercial software coupled with detailed chemical kinetics. ...
Homogeneous charge compression ignition engine is a promising alternative to traditional internal combustion engines mainly due to its high thermal efficiency, low NOx, and soot emissions. Heat transfer from gases to the combustion chamber walls has a significant effect on the combustion, performance, and formation of pollutants in HCCI engines. This study used the zero-dimensional single-zone model coupled with detailed chemical kinetics to compare the accuracy of different semi-empirical heat transfer models In the single-zone model, the heat transfer models including, Annand, Woschni, Hohenberg, Assanis, and Hensel were evaluated in a wide working range of a natural gas-fueled HCCI engine. To the best of the author's knowledge, the heat transfer has not been experimentally measured in an HCCI engine fueled with natural gas. Therefore, in this investigation, a three-dimensional computational fluid dynamics model with detailed chemical kinetics has been considered to study the heat transfer models. The validation results indicated that the 3D model could accurately estimate the engine-out parameters. Besides, the response surface method was employed to evaluate the impacts of the engine operating parameters, including the intake pressure (1, 1.25, and 1.5 bars), equivalence ratio (0.3, 0.5, and 0.7), and engine speed (800, 1100, and 1400 rpm) on the heat flux as a response factor. The results indicated that Assanis and Hohenberg heat transfer models had the best performance in estimating the heat transfer of an HCCI engine with an average error of 14.3% and 16.3%, respectively, compared with the 3D model.
