PDF modelling of turbulent non-premixed combustion with detailed chemistry

Numerical and experimental investigation of turbulent three separated jets

In the present study, the effects of a directed co-flow on the process of mixture jet with variable density have been investigated numerically. Three density ratios were considered namely Rρ=0.55, 1.5 and 1.52, respectively, for binary mixtures methane-air, carbon dioxide-air and propane-air. The directed co-flow preserves its axial symmetry at the inlet and its direction varies between +20° and −20°. In addition, the k − ɛ model and model equation of the algebraic non-equal scales are used to investigate effects of the variable density in axisymmetric turbulent jet. Comparative studies are presented in the case of the calculations of the average variables such as the longitudinal velocity, species concentration and the turbulent kinetic energy. The results obtained indicate that the directed co-flow with positive angles enhances considerably the mixing.

Effects of a directed co-flow on a non-reactive turbulent jet with variable density

Thermal striping in triple jet flow

Large eddy simulation of two isothermal and reacting turbulent separated oxy-fuel jets

A study of turbulence/combustion interactions in a relatively large turbulent diffusion flame of an axisymmetric methane jet into air is presented. A first order k–ɛ turbulence closure model is used along with two different models (equal scales and non-equal scales) for the submodel describing the scalar dissipation rate. The flamelet concept is used to model the turbulent combustion along with a joint mixture fraction/strain rate probability density function (PDF) for the prediction of the average parameters of the turbulent diffusion flame. The numerical approach is that of Patankar and Spalding, while the flamelet simulations are obtained from the RUN-1DL code of Rogg and co-workers based on a 17 species detailed reaction mechanism. The chosen configuration is that of the experimentally studied turbulent diffusion flame of Streb [1]. A comparison between these experimental results and the obtained numerical ones is thus presented. Relatively good agreements are obtained which show the usefulness of the two-scale model compared to the classical one-scale model for predicting turbulent diffusion flames. Nonetheless some discrepancies are obtained in the outer and downstream regions of the jet, especially in comparison with the experimental data. These are attributed to short coming of the considered turbulence model and soot radiation which is not accounted for.

Dynamic and scalar turbulent fluctuation in a diffusion flame of an-axisymmetric methane jet into air

The Transport of a scalar quantity in a turbulent round jet is addressed by testing and applying the non- equal scales model based on the two-Scale-Direct-Interaction-Approximation (TSDIA) of Yoshizawa for three first order models. In this way the assumption of equal time scales for mechanical and scalar turbulence, leading to a constant turbulent Schmidt number is no longer needed. It is shown that the trends, which are observed in the experiments, are reproduced qualitatively by the non-equal scales model.

Scalar dissipation rate modelling in turbulent jets using first-order models

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Dynamic and scalar turbulent fluctuation in a diffusion flame of an-axisymmetric methane jet into air

Scalar dissipation rate modelling in turbulent jets using first-order models