Fundamental research of turbulent combustion often requires the unambiguous localization of ame front positions and structures. Laser-induced uorescence (LIF) imaging provides di erent possibilities of detecting two-dimensional distributions of species typical for reactive areas. Simultaneous measurements of hydroxyl and formaldehyde laserinduced uorescence and total number densities by Rayleig...

A three-dimensional direct numerical simulation database of an open turbulent jet spray flame representing a laboratory-scale burner configuration has been analyzed to investigate self-interactions (FSIs) in the presence flow induced shear, best authors' knowledge, for first time. The FSI occurrences [i.e., unburned gas mixture pockets (UBGPs), tunnel formations (TFs), closures (TCs), and burne...

The nature of carbon burning flames in Type Ia supernovae is explored as they interact with Kolmogorov turbulence. One-dimensional calculations using the Linear Eddy Model of Kerstein (1991) elucidate three regimes of turbulent burning. In the simplest case, large scale turbulence folds and deforms thin laminar flamelets to produce a flame brush with a total burning rate given approximately by ...

In this work, we develop the large-eddy simulation (LES)/probability density function (PDF) simulation capability for turbulent combustion and apply it to a turbulent CH4=H2=N2 jet flame (DLR Flame A). The PDF code is verified to be second-order accurate with respect to the time-step size and the grid size in a manufactured one-dimensional test case. Three grids ð64 64 16; 192 192 48; 320 320 8...

This paper describes an experimental investigation of acoustically forced lean premixed turbulent bluff-bodystabilised flames in an enclosure short enough so that no coupling of the combustor downstream acoustics occurred for the frequencies studied here, which allows an unambiguous examination of the flame response to inlet velocity fluctuations. Special emphasis was placed on the amplitude de...

Experimental propane/air Bunsen flame at atmospheric pressure are investigated in the context of DarrieusLandau (DL) instability. Results from asymptotic theory are utilized in order to estimate the non-dimensional critical length scale δc = LD/λc (LD the flame thickness and λc the critical length scale). The non-dimensional flame thickness δ = LD/L is varied either by varying the equivalence r...

In 1979, Professor Bilger was among the first faculty to have a sabbatical visit at the new Combustion Research Facility (CRF) at Sandia Laboratories, in Livermore, California. During this sabbatical, Professor Bilger received from Dr. Mike Drake, then at General Electric Corporate Research and Development, an advance copy of the pioneering paper of Raman scattering in a turbulent flame of H2 i...

Soot volume fraction and number density in a turbulent diffusion flame burning kerosene/air were predicted using two approaches. The first used a conventional soot inception model based on the acetylene concentration and is referred to as the acetylene model. The second used a soot inception model based on the formation rate of three and two ring aromatics [1] and is referred to as the PAH ince...

An improved spark ignition model has been developed and implemented into the KIVA-3V code. In this model, the spark ignition kernel growth is tracked by Lagrangian particle markers. The effects of turbulent flow and spark discharge energy on the kernel growth are considered. After the ignition kernel size exceeds a critical size related to the integral turbulent length scale of the flow, the tu...