The propagation of outwardly expanding premixed flames in turbulent media is examined within the context hydrodynamic theory wherein flame, treated as a surface density discontinuity separating fresh combustible mixture from burned products, propagating at speed dependent upon local geometric and mixture/flow characteristics. An embedded manifold approach, one adept handling multi-valued disjoi...

A turbulent lifted slot-jet flame is studied using direct numerical simulation (DNS). A single step chemistry model is employed with a mixture-fraction dependent activation energy to quantitatively reproduce the dependence of laminar burning rate on equivalence ratio that is typical of hydrocarbon fuels. It is observed that the leading flame edge exhibits a single branch close to the stoichiome...

A novel flame retardant, zinc hydroxystannate-decorated graphene oxide (ZHS/GO) nanohybrid, was successfully prepared and well characterized. Herein, the ZHS nanoparticles could not only enhance the flame retardancy of GO with the synergistic flame-retardant effect of ZHS but also prevent the restack of GO to improve the mechanical properties of poly (vinyl chloride) (PVC) matrix. The structure...

The potential of Palm Methyl Esters (PME) as an alternative fuel for gas turbines is investigated using a swirl burner. The main air flow is preheated to 623 K and a swirling spray flame is established at atmospheric pressure. The spray combustion characteristics of PME are compared to diesel and Jet-A1 fuel under the same burner power output of 6 kW. Investigation of the fuel atomizing charact...

We study the evolution of an initially spherical kernel of burned gas in a fresh reactive mixture in the presence of a gravity field. The study is carried out numerically in the framework of an axisymmetric geometry, the chemistry being modeled by an irreversible overall one-step reaction. Attention is focused on the influence of two nondimensional parameters, namely the reciprocal of the Froud...

An experimental and computational investigation on the liftoff characteristics of laminar partially premixed flames (PPFs) under normal (1-g) and microgravity (μ-g) conditions is presented. Lifted methane–air PPFs were established in axisymmetric coflowing jets using nitrogen dilution and various levels of partial premixing. The μ-g experiments were conducted in the 2.2-s drop tower at the NASA...