Relationship between local reaction rate and flame structure in turbulent premixed flames from simultaneous 10 kHz TPIV, OH PLIF, and CH2O PLIF

Osborne, Jeffrey R.; Ramji, Sarah Ann; Carter, Campbell D.; Steinberg, Adam M.

doi:10.1016/j.proci.2016.07.124

Cited by 38 publications

(7 citation statements)

References 17 publications

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“…for the investigations of turbulence-flame interactions. It is, in principle, different from the fluid particle/parcel tracking widely used in non-reacting turbulence studies and the reacting flow studies of Day et al (2012Day et al ( , 2015, Osborne et al (2017) and Hamlington et al (2017). Sometimes, the fluid parcels can be complex fluid-dynamic strain-rate structures of the turbulent flow field (Steinberg & Driscoll 2009).…”

Section: Forward Flame Particle Trackingmentioning

confidence: 99%

Evolution of local flame displacement speeds in turbulence

Dave

Chaudhuri

2019

J. Fluid Mech.

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Section: Forward Flame Particle Trackingmentioning

confidence: 99%

Evolution of local flame displacement speeds in turbulence

Dave

Chaudhuri

2019

J. Fluid Mech.

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“…2011; Coriton, Steinberg & Frank 2014; Osborne et al. 2016, 2017; Wabel, Skiba & Driscoll 2017 a ; Wabel et al. 2017 b ).…”

Section: Data Processing and Uncertaintymentioning

confidence: 99%

“…That is, the PLIF data are used to separate the flow into unburnt (c = 0) and burnt (c = 1) regions; intermediate values of c are not considered. This is most commonly done based on OH PLIF images, in which the OH PLIF signal rapidly increases in the thin oxidation layer of the flame (Steinberg et al 2011;Coriton, Steinberg & Frank 2014;Osborne et al 2016Osborne et al , 2017Wabel, Skiba & Driscoll 2017a;Wabel et al 2017b).…”

Section: Analysis Of Ch 2 O Plifmentioning

confidence: 99%

Enstrophy transport in swirl combustion

2019

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The contributions of vortex stretching, dilatation, baroclinic torque and viscous diffusion to Reynolds-averaged enstrophy transport in turbulent swirl flames were experimentally measured using tomographic particle image velocimetry and $\text{CH}_{2}\text{O}$ planar laser induced fluorescence at jet Reynolds numbers of 26 000–51 000. The mean baroclinic torque was determined by subtracting the other terms in the enstrophy transport equation from the mean Lagrangian derivative. Enstrophy production from baroclinic torque was found to be significant relative to the other transport terms across all conditions studies. This result contrasts with direct numerical simulations of flames in homogeneous isotropic turbulence, which show a decreasing relative significance of baroclinic torque with increasing turbulence intensity (e.g. Bobbitt, Lapointe & Blanquart, Phys. Fluids, vol. 28 (1), 2016, 015101). Hence, the significance of baroclinic enstrophy production in flames is not determined entirely by the local turbulence and flame properties, but also depends on the configuration-specific pressure field.

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“…Numerous numerical and experimental studies have been performed to understand the intrinsic behavior of 𝑆 𝐷 with respect to flame structure [e.g. [3][4][5][6][7], flame stretch (including strain and curvature) [e.g. [6][7][8][9], turbulence intensity [e.g.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the detailed flame transport in a SI engine using simultaneous dual-plane OH-LIF and stereoscopic PIV

Peterson

Baum

Dreizler

et al. 2019

Combustion and Flame

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Understanding the detailed flame transport in IC engines is important to accurately predict ignition and combustion phasing, rate of heat release and assess engine performance. This is particularly important for RANS and LES engine simulations, which often struggle to accurately predict flame propagation and heat release without first adjusting model parameters. Detailed measurements of flame transport in technical systems are required to guide model development and validation. This work introduces an experimental dataset designed to study the detailed flame transport and flame/flow dynamics for spark-ignition engines. Simultaneous dual-plane OH-LIF and stereoscopic PIV is used to acquire 3D measurements of unburnt gas velocity (⃑ ⃑), flame displacement speed () and overall flame front velocity (⃑ ⃑) during the early flame development. Experiments are performed in an optical engine operating at 800 and 1500 RPM with premixed, stoichiometric isooctane-air mixtures. Analysis reveals several distinctive flame/flow configurations that yield a positive or negative flame displacement for which the flame progresses towards the reactants or products, respectively. For the operating conditions utilized, exhibits and inverse relationship with flame curvature and a strong correlation between negative and convex flame contours is observed. Trends are consistent with thermo-diffusive flames, but have not been quantified in context of IC engines. Flame wrinkling is more severe at the higher RPM, which results in a broader distribution towards higher positive and negative velocities. Spatially-resolved distributions of ⃑ ⃑ and are presented to describe in-cylinder locations where either convection or thermal diffusion is the dominating mechanism contributing to flame transport. Findings are discussed in relation to common engine flow features, including flame transport near solid surfaces. Findings provide a first insight into the detailed flame transport within a technically relevant environment and are designed to support the development and validation of engine simulations.

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Relationship between local reaction rate and flame structure in turbulent premixed flames from simultaneous 10 kHz TPIV, OH PLIF, and CH2O PLIF

Cited by 38 publications

References 17 publications

Evolution of local flame displacement speeds in turbulence

Evolution of local flame displacement speeds in turbulence

Enstrophy transport in swirl combustion

An experimental study of the detailed flame transport in a SI engine using simultaneous dual-plane OH-LIF and stereoscopic PIV

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