An extension to the level set flamelet model of Peters [1] for premixed turbulent combustion that takes the effects of cold ambient air entrainment into account is presented. The model is valid in the flamelet regime, where the reaction zone thickness is smaller than the Kolmogorov length scale. The inner structure of the instantaneous flame front is taken into account by a presumed pdf approac...

In this paper, we critically analyzed possibilities of probability density function (PDF) methods for the closed-form description combustion chemical effects in turbulent premixed flames. We came to conclusion that concept a classical modeling strategy PDF method based on use reaction-independent mixing models is not applicable The reason strong dependence reactions due thin-reaction-zone natur...

The Lagrangian Flamelet Model is formulated as a combustion model for large-eddy simulations of turbulent jet diffusion flames. The model is applied in a large-eddy simulation of a piloted partially premixed methane/air diffusion flame ~Sandia flame D!. The results of the simulation are compared to experimental data of the mean and RMS of the axial velocity and the mixture fraction and the unco...

This research addresses the flame structure of single aluminum particles burning in air with the emphasis on the transition from spherically symmetric to non-symmetric combustion regime. The unique feature of this work is that free motionless aluminum particles were produced and ignited in both normal and microgravity environments. That allowed us to observe whether the particle flame non-symme...

A new combustion model is developed and applied to simulate combustion in dual-fuel engines in which the premixed natural gas is ignited by the combustion flame initiated by a diesel spray. The model consists of a diesel auto-ignition model and a flame propagation model. A G-equation model previously developed to simulate SI engine combustion was incorporated with an auto-ignition model to simu...

The stochastic model of cool-flame combustion a hydrocarbon mixture is considered. For this 3D model, noise excitement large-amplitude oscillations in the parametric zone, where deterministic has single equilibrium attractor, studied. By statistics interspike intervals, phenomenon anti-coherence resonance revealed. To estimate threshold intensities that causes excitement, sensitivity technique ...

Practically, an accurate combustion chemistry model is of great importance in engine simulations when it is combined with the computational fluid dynamics computations. Syngas is used as one of the fuel options in internal combustion engines. In the current work, we optimize a combustion chemistry model of syngas using machine learning algorithms. Result shows that the optimized model can achie...

Homogeneous charge compression ignition is considered a promising solution to face the increasing regulations imposed by legislator in transport sector, thanks pollutant and CO2 emissions reduction. In this work, quasi-dimensional multi-zone HCCI model integrated with 1D commercial software developed validated. It based on control mass Lagrangian approach computes mixture chemistry evolution th...