Vorticity generation and attenuation as vortices convect through a premixed flame

Mueller, Charles J.; Driscoll, James F.; Reuss, David L.; Drake, Michael C.; Rosalik, M.E.

doi:10.1016/s0010-2180(97)00122-3

Cited by 137 publications

(53 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect has been studied by Rutland & Ferziger (1991), who carried out a two-dimensional simulation. Mueller et al (1998) performed particle image velocimetry (PIV) measurements of the interaction between a vortex pair and a premixed flame, which provided the first quantitative experimental results of the generation of vorticity in premixed combustion. Louch & Bray (1998) have performed two-dimensional simulations of Mueller's experiments.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of homogeneous turbulence in combination with premixed combustion at low Mach number modelled by the $G$-equation

2006

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of homogeneous turbulence in combination with premixed combustion at low Mach number modelled by the $G$-equation

2006

View full text Add to dashboard Cite

show abstract

“…Section 2 defines the general flame/vortex interaction problem that will be solved numerically. Such flame vortex interactions were extensively investigated to describe fundamental combustion processes (see, e.g., [57,58,59,60,61,62]), and they also have been examined in some clever experiments (see, e.g., [63,64,65,66,67,68,69]). An AMR technique was also recently coupled with a level-set method in [70] to describe flame/vortex interaction problems.…”

Section: Introductionmentioning

confidence: 99%

Time–space adaptive numerical methods for the simulation of combustion fronts

Duarte¹,

Descombes²,

Tenaud³

et al. 2013

Combustion and Flame

View full text Add to dashboard Cite

To cite this version:Max Duarte, Stéphane Descombes, Christian Tenaud, Sébastien Candel, Marc Massot. Time-space adaptive numerical methods for the simulation of combustion fronts. Combustion and Flame, Elsevier, 2013, 160 (6) AbstractThis paper presents a new computational strategy for the simulation of combustion fronts based on adaptive time operator splitting and spatial multiresolution. High-order and dedicated onestep solvers compose the splitting scheme for the reaction, diffusion, and convection subproblems, to independently cope with their inherent numerical difficulties and to properly solve the corresponding temporal scales. Adaptive and thus highly compressed spatial representations for localized fronts originating from multiresolution analysis result in important reductions of memory usage, and hence numerical simulations with sufficiently fine spatial resolution can be performed with standard computational resources. The computational efficiency is further enhanced by splitting time steps established beyond standard stability constraints associated to mesh size or stiff source time scales. The splitting time steps are chosen according to a dynamic splitting technique relying on solid mathematical foundations, which ensures error control of the time integration and successfully discriminates time-varying multi-scale physics. For a given semidiscretized problem, the solution scheme provides dynamic accuracy estimates that reflect the quality of numerical results in terms of numerical errors of integration and compressed spatial representations, for general multi-dimensional problems modeled by stiff PDEs. The strategy is efficiently applied to simulate the propagation of laminar premixed flames interacting with vortex structures, as well as various configurations of self-ignition processes of diffusion flames in similar vortical hydrodynamics fields. A detailed study of the error control is provided and show the potential of the approach. It yields large gains in CPU time, while consistently describing a broad spectrum of space and time scales as well as different physical scenarios.

show abstract

“…In recent years, different mechanisms have been identified that cause these instabilities, such as feedback loops between pressure and heat release fluctuations [5], flow instabilities and unsteady air-fuel mixing [12]. All these instabilities can have a major impact on combustion leading to flame front disturbances and fluctuations of the heat release [2,8] and may significantly compromise the NOx emissions [7].…”

Section: Introductionmentioning

confidence: 99%

Unsteady flame and flow field interaction of a premixed model gas turbine burner

Schildmacher

Hoffmann

Selle

et al. 2007

Proceedings of the Combustion Institute

View full text Add to dashboard Cite

In recent years, the NOx emissions of heavy duty gas turbines have been significantly reduced by introducing lean premixed combustion. However, these flames are known to be prone to combustion instabilities, which became the key issue of modern gas turbine combustion research. In this paper, investigations of a single model gas turbine burner are presented with special focus on thermo-acoustic eigenmodes of the combustor and the resulting interaction between periodic flow field oscillations and flame front fluctuations. A numerical analysis of the eigenmodes of the combustor rig was preformed and compared to pressure probe measurements. By the numerical analysis Helmholtz mode pressure oscillations were predicted to be present in the air plenum upstream the burner as well as in the combustion chamber. These oscillation modes could well be confirmed by the analysis of the pressure signals taken at different position within the combustor rig. By these pressure oscillations thermo-acoustic flame instabilities are triggered. Due to a phase lag between the pressure oscillations in the air plenum and those in the combustion chamber, fluctuations of air flow through the burner are induced, which in turn cause fluctuations of the equivalence ratio at the burner exit plane. As result, fluctuations of the heat release rate within the flame are established, which interfere with the acoustics of the rig and, thus, unstable combustion is maintained. The dynamics of the flow field and of the flame was studied experimentally by phase-locked LDA and OH-LIF diagnostics. The experimental results give an excellent insight into the chain of processes that are responsible for the thermo-acoustic instabilities. Interestingly, two different oscillation modes could be identified depending on the amplitude of the oscillations. At low oscillation levels only weak and locally confined velocity fluctuations in the main reaction zone were observed which do not have any significant impact on the flame. By increasing the equivalence ratio, the transition from low to high oscillation levels can be triggered. Under high oscillation levels, a pumping motion of the flow field in axial direction could be identified which causes strong periodic disturbances of the flame.

show abstract

Vorticity generation and attenuation as vortices convect through a premixed flame

Cited by 137 publications

References 18 publications

Direct numerical simulation of homogeneous turbulence in combination with premixed combustion at low Mach number modelled by the $G$-equation

Direct numerical simulation of homogeneous turbulence in combination with premixed combustion at low Mach number modelled by the $G$-equation

Time–space adaptive numerical methods for the simulation of combustion fronts

Unsteady flame and flow field interaction of a premixed model gas turbine burner

Contact Info

Product

Resources

About