Simulation of the Self-Ignition of a Cold Premixed Ethylene-Air Jet in Hot Vitiated Crossflow

Solana-Pérez, Roberto; Schulz, O.; Noiray, Nicolas

doi:10.1007/s10494-020-00212-3

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…Large-eddy simulations (LES) (Schulz & Noiray 2019; Schulz et al. 2019; Solana-Pérez, Schulz & Noiray 2021) were performed based on the experiment of Wagner et al. (2015) and the spatio-temporal evolution of the auto-ignition process along the windward mixing layer was analysed.…”

Section: Introductionmentioning

confidence: 99%

“…These studies suggested that auto-ignition is the dominant flame stabilization mechanism for the unsteady windward flame, and premixed flame propagation is dominant for the leeward flame. Large-eddy simulations (LES) Solana-Pérez, Schulz & Noiray 2021) were performed based on the experiment of Wagner et al (2015) and the spatio-temporal evolution of the auto-ignition process along the windward mixing layer was analysed.…”

Section: Introductionmentioning

confidence: 99%

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A direct numerical simulation study on the structures and turbulence–flame interactions of a laboratory-scale lean premixed jet flame in cross-flow

Cheng

Wang²,

Luo³

et al. 2023

J. Fluid Mech.

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In the present work, direct numerical simulation of a laboratory-scale lean premixed reacting jet in cross-flow was performed to explore the flow–flame structures and turbulence–flame interactions. A jet of lean premixed ethylene–air mixtures (equivalence ratio $\phi = 0.6$ ) was injected into a hot vitiated cross-flow. Both non-reacting and reacting cases were simulated. It was found that the reacting jet penetrates deeper in the cross-flow with a weaker shear layer compared with the non-reacting one. The wake of the non-reacting and reacting jet is characterized by vertical vortices and recirculation zones, respectively. As for the flame structure of the reacting case, the reaction intensity varies considerably in different flame zones. The heat release rate on the leeward side is higher than that on the windward side, but lower than that of the corresponding laminar flame. The analysis of the turbulence–flame interactions of the reacting case showed that the large local Damköhler number ( $Da$ ) related to reaction-induced dilatations results in an increased tendency of the scalar gradient to align with the most extensive strain rate, which is more evident in the regions with high heat release rate on the leeward side. Negative dilatation regions with positive tangential strain rate and negative normal strain rate are observed on the windward side. High positive dilatations appear on the flame front of the leeward side. The tangential strain rate is negatively correlated with the normal strain rate and curvature. Regions with a high local $Da$ on the windward side correspond with high positive curvature regions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A direct numerical simulation study on the structures and turbulence–flame interactions of a laboratory-scale lean premixed jet flame in cross-flow

Cheng

Wang²,

Luo³

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…This allows for good mixing between the fresh fuel and the hot vitiated products, leading to a partially-premixed type of flame. Several studies analyzed flame stabilization mechanisms in second stage flames featuring a jet-in-crossflow configuration [10,11] where [10] used H 2 -rich fuels. In sequential combustion configuration [12][13][14][15][16][17][18][19] used natural gas/air mixtures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixing on the Anchoring and Combustion Regimes of Pure Hydrogen Flames in Sequential Combustors

Solana-Pérez

Shcherbanev

Ciani³

et al. 2022

Journal of Engineering for Gas Turbines and Power

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In this work we perform an experimental study of the combustion of pure hydrogen in the sequential stage of a generic combustor. This academic test rig is a simplified model of an industrial sequential combustor. The sequential fuel is injected using different injector geometries. The composition and temperature of the hot stream at the inlet of the sequential burner are defined by the mass flows of the hot combustion products from the first stage and of the dilution air. This temperature is varied between 1100 K and 850 K by modifying the dilution air mass flow in order to study the different combustion regimes of the sequential hydrogen flame. High-speed imaging of OH radicals chemiluminescence is performed with optical emission spectroscopy to measure vitiated gas temperatures. We investigate the transition from a flame anchored in the sequential combustion chamber, to one stabilized upstream into the mixing section, when the inlet flow temperature is increased. Of particular interest is the increasing rate of formation of autoignition kernels in this transition process. The underlying combustion regime change is analyzed with 0D reactor simulations, and the limitations of such a simplified low-order model of the flame location are discussed. The effects and importance of the mixing process between fresh fuel and the hot vitiated co-flow is examined. Two different injectors are compared under the same operating conditions that provide different degrees of mixing and allow to demonstrate the impact of mixing quality on the flame morphology.

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Section: Introductionmentioning

confidence: 99%

Effect of Mixing on the Anchoring and Combustion Regimes of Pure Hydrogen Flames in Sequential Combustors

Solana-Pérez

Shcherbanev

Ciani³

et al. 2022

Volume 3A: Combustion, Fuels, and Emissions

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In this work we perform an experimental study of the combustion of pure hydrogen in the sequential stage of a generic combustor. This academic test rig is a simplified model of an industrial sequential combustor. The sequential fuel is injected using different injector geometries. The composition and temperature of the hot stream at the inlet of the sequential burner are defined by the mass flows of the hot combustion products from the first stage (30 kW natural gas-air flame with equivalence ratio of 0.7) and of the dilution air. This temperature is varied between 1100 K and 850 K by modifying the dilution air mass flow in order to study the different combustion regimes of the sequential hydrogen flame. High-speed imaging of OH radicals chemiluminescence is performed with optical emission spectroscopy to measure vitiated gas temperatures. In particular, we investigate the transition from a flame anchored in the sequential combustion chamber, to the situation where it stabilizes upstream into the mixing section, when the inlet flow temperature is increased. Of particular interest is the increasing rate of formation of autoignition kernels in this transition process. The underlying combustion regime change is analyzed with 0D reactor simulations, and the limitations of such a simplified low-order model of the flame location are discussed. The effects and importance of the mixing process between fresh fuel and the hot vitiated co-flow is examined. Two different injectors are compared under the same operating conditions that create different flow structures along the mixing section. As a result of that, they provide different degrees of mixing between the hydrogen and the hot vitiated flow and allow to demonstrate the impact of mixing quality on the flame morphology.

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Simulation of the Self-Ignition of a Cold Premixed Ethylene-Air Jet in Hot Vitiated Crossflow

Cited by 8 publications

References 47 publications

A direct numerical simulation study on the structures and turbulence–flame interactions of a laboratory-scale lean premixed jet flame in cross-flow

A direct numerical simulation study on the structures and turbulence–flame interactions of a laboratory-scale lean premixed jet flame in cross-flow

Effect of Mixing on the Anchoring and Combustion Regimes of Pure Hydrogen Flames in Sequential Combustors

Effect of Mixing on the Anchoring and Combustion Regimes of Pure Hydrogen Flames in Sequential Combustors

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