Phenomenological Combustion Models

摘要: For the calculation of engine combustion processes, various model categories can be employed, which are quite diverse in their level detail, but also time requirements, see Stiesch (2003). Calculation models customarily designated as phenomenological that calculate and pollutant formation contingent upon important physical chemical phenomena like spray dispersion, mixture formation, ignition, reaction kinetics, etc. Because a spatial subdivision space into zones varying temperature composition is often necessary, referred to quasidimensional models. Phenomenological (or quasidimensional) differ on one hand from zero-dimensional simplified thermodynamic) models, simplify chamber being ideally mixed at every point based empirical approaches for rate. On other hand, CFD codes (CFD = computational fluid dynamics, Chap. 12 ff.), we consciously do without an explicit solution turbulent three-dimensional flow field, reduce considerably (Fig. 11.1). The revolution lies region seconds while it takes hours 11.2).