Study of gas fuel temperature influence on combustion performance by means of numerical modeling is a main objective of this work. Combustion of a single jet of propane in a cross-flowing stream of preheated and oxygen deficient air is analyzed. Both Eddy-Break-Up and PDF/mixture fraction combustion models coupled with RNG k-ε turbulent model were applied and compared. Thermal and prompt NOx mo...

the premixed counterflow flames propagation in combustion of mixture which is a uniform mixture of fuel particles and air is analytically studied. this analysis framework is based on thermal-diffusion model with assumption that the lewis number is unit and the strain rate is constant. velocity profile is assumed as a function of one variable like x. the structure of the flame is presumed to con...

Applying the Bray-Moss-Libby (BML) bi-modal asymptotic limit to a progress variable signal in premixed turbulent flame, relation is established between variation rate of mean flame brush thickness, surface wrinkling and burning velocity. This scaling suggests that link amplification by turbulence increase velocity may need be modulated corrective term proportional thickness. correction expected...

A systematic evaluation of the stability of a re-circulation zone behind a backward facing step under conditions expected in an aircraft engine nacelle has been conducted together with the evaluation of the effects of the flow structure on a propane diffusion flame established downstream of the step. The objective being to characterize a “worst case” fire scenario. Characterization of the non-r...

We develop a one-dimensional theoretical model for thermals burning in Type Ia supernovae based on the entrainment assumption of Morton, Taylor and Turner. Extensions of the standard model are required to account for the burning and for the expansion of the thermal due to changes in the background stratification found in the full star. The model is compared with high-resolution three-dimensiona...

Turbulent multi-phase combustion is encountered in a number of engineering applications, such as internal combustion engines and gas-turbine aircraft engines. Therefore, the ability to perform accurate numerical simulations of these systems is of paramount importance to improve their design and efficiency. However, the underlying physics of spray combustion are extremely complicated. The liquid...

We report a large-eddy simulation (LES)/probability density function (PDF) study of a non-premixed CO/H2 temporally-evolving turbulent planar jet flame, which has previously been studied using direct numerical simulations (DNS) with a skeletal chemical mechanism. The flame exhibits strong turbulence– chemistry interactions resulting in local extinction followed by re-ignition. In this study, th...