The combustion analysis on HCCI (homogen charge compression ignition engine)

Experimental researches on internal combustion engine for design and product development both cost high and take up long time. In this study, open source multi dimensional modeling tools which are used on internal combustion engine modeling is explaned. KIVA4 and OpenFOAM codes including different numerical models/approaches and written with different programming languages were comparedFirstly, a multi-dimensional model was used for Caterpillar 3401E engine. Modeling of combustion process was performed by being used n-heptane (RON0) reaction mechanism which includes 29 species and 52 reactions in a single-zone numerical model in which is used for data being obtained by CFD code as an initial value. After the process of combustion was investigated, 0.3 equivalence ratio was determined as an optimum value, in a consequence of studies were performed at the different equivalence ratios (0.01.-0.5) according to in-cylinder temperature and emission values. The effect of different EGR rates (%0-%35) on combustion process was investigated at 0.3 equivalence ratio. It is confirmed while the combustion reactions took up longer time depending on the rise in ERG ratio, in-cylinder pressure and temperature values were reduced. Consequently, as a conclusion a positive effect will be obtained on reducing of NOx emission depending on temperature.The comparison was performed between data were obtained by the experiments and modeling with used RON0, RON20, RON40 and RON60 fuels. The experiments were performed at 2200 rpm engine speed and five different engine loads (4, 8, 12, 16 and 20 Nm). The 6 different reaction mechanisms were used to model combustion process of primary reference fuels (PRF). The single-zone numerical model and CFD models were used from among of engine modeling methods. Chemkin software was used as a the single-zone numerical model tool and OpenFOAM codes were used as a CFD modeling tool which is used three dimensional geometry. Besides, the effects of the different working parameters on combustion of homogeneous charged compression ignition (HCCI) engine were examined by means of numerical models