methane number calculation software avl 3.1

In this combustion process, a homogeneous, lean fuel gas mixture is introduced into the combustion chamber and ignited with a diesel jet. This is especially true for road freight traffic, off-road applications and marine propulsion. The favorable availability of gaseous fuels will increase the importance of so-called dual fuel combustion processes. The adjusted mechanism is able to describe ignition phenomena in the context of natural gas–diesel, i.e., dual fuel combustion.įuture emission legislations require new technologies and technological improvements in the field of internal combustion engines in terms of engine concepts and alternative fuels like e-fuels, biofuels and fuel blends. For the identification of the reactions suitable for the mechanism adaption, sensitivity and flow analyzes were performed. The observed deviations between the simulation results and the measurements performed with a rapid compression expansion machine (RCEM) and a combustion vessel motivated the adaptation of the mechanism by adjusting the Arrhenius parameters of individual reactions.

The selected mechanism was used for computational fluid dynamics (CFD) simulations to calculate the ignition of a diesel spray injected into air and a natural gas–air mixture. By comparing the measured and calculated ignition delay times (IDTs) of different homogeneous methane–propane– n-heptane mixtures, six different n-heptane mechanisms were investigated and evaluated. In this study, a reaction mechanism is presented that is optimized for the simulation of the dual fuel combustion process using n-heptane and a mixture of methane/propane as surrogate fuels for diesel and natural gas, respectively.

Methane number calculation software avl 3.1