Analysis of Wall–flame Interaction in Laminar Non-premixed Combustion

Ciottoli, Pietro Paolo; Galassi, Riccardo Malpica; Angelilli, Lorenzo; Cuoci, Alberto; Im, Hong G.; Valorani, Mauro

doi:10.1080/00102202.2019.1678963

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…The timescales of the modes are ordered from fast to slow and according to the criterion originally introduced in [29] and later revised in [67], the timescales (and the modes they associate with) can be classified as fast (τ 1 < ... < τ M ) and slow (τ M +1 < ... < τ N +1 ) [68][69][70]. The fast timescales are responsible for the generation of the constraints in the phase space (i.e., the slow invariant manifold) on which the slow system evolves.…”

Section: Methodsmentioning

confidence: 99%

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames

Tingas

2021

Fuel

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Section: Methodsmentioning

confidence: 99%

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames

Tingas

2021

Fuel

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“…The computational singular perturbation (CSP) method [19] provides a theoretical and computational framework to characterize the dynamics of linear and non-linear multiscale systems. The method has been extensively applied to the analysis of chemically reactive systems [29][30][31][32][33][34][35][36][37], and biochemical systems [10,11], involving a large number of time scales associated with chemical reactions.…”

Section: Csp Applied To Droplet Dynamicsmentioning

confidence: 99%

Analysis of droplet evaporation dynamics using computational singular perturbation and tangential stretching rate

Angelilli,

Galassi,

Ciottoli

et al. 2024

Preprint

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Computational singular perturbation (CSP) has been successfully used in the analysis of complex chemically reacting flows by systematically identifying the intrinsic timescales and slow invariant manifolds that capture the essential subprocesses driving the dynamics of the system. In this article, the analytical and computational framework is applied for the first time to analyze the Lagrangian droplets undergoing evaporation and dispersion in the surrounding gases. First, a rigorous mathematical formulation is derived to adapt the CSP tools into the droplet dynamics equations, including the formal definition of the tangential stretching rate (TSR) that represents the explosive/dissipative nature of the system. A steady ammonia and a falling water droplet studies are then conducted to demonstrate the utility of the CSP methodology in identifying various physical mechanisms driving the evolution of the system, such as the distinction of thermal-driven and mass-driven regimes. Various definitions of the importance indices are also examined to provide in-depth analysis of different subprocesses and their interactions in modifying the droplet dynamics.

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“…The accuracy and the sensitivity of the solution to the chemical kinetic model was assessed by Angelilli et al [16], where it was found that the DIMA15 mechanism [31,32] reduced through the computational singular perturbation (CSP) reduction method [33] is sufficient to capture the flame dynamics. Accordingly, the DIMA15 mechanism was used in the present study.…”

Section: Test Case Descriptionmentioning

confidence: 99%

A Lagrangian analysis of combustion regimes using multi-modal turbulent combustion model

Angelilli

Ciottoli

Pérez

et al. 2023

Preprint

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High Reynolds number turbulent reacting flows poses a modeling challenge due to the multi-regime, mixed-mode nature of the combustion processes. The present study attempts to provide insights into the complex combustion characteristics in turbulent flames by conducting highly resolved large eddy simulations of the Darmstadt multi-regime burner exhibiting both premixed and nonpremixed combustion regimes with occurrences of local extinction and re-ignition. Massless Lagrangian particles are transported along with the flow in order to monitor the evolution of the local flow-chemistry interaction. The simulations are validated against experimental data, and the Lagrangian properties are compared against the traditional premixed model in progress variable space and a generalized multi-modal manifold model in mixture fraction and generalized progress variable space. The comparison reveals that minor radical species are sensitive to the generalized progress variable dissipation rates, and the multi-modal manifold model is more suitable to reproduce the complex flame structure. Using the multi-modal model framework, the evolution of the combustion regimes is analyzed by the slope of the Lagrangian particle trajectory in the phase space.

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Analysis of Wall–flame Interaction in Laminar Non-premixed Combustion

Cited by 9 publications

References 23 publications

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames

Analysis of droplet evaporation dynamics using computational singular perturbation and tangential stretching rate

A Lagrangian analysis of combustion regimes using multi-modal turbulent combustion model

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