Application of a Nonadiabatic Flamelet/Progress-Variable Approach to Large-Eddy Simulation of H2/O2 Combustion Under a Pressurized Condition

Kishimoto, Akihiro; Moriai, Hideki; Takenaka, Kenichiro; Nishiie, Takayuki; Adachi, Masaki; Ogawara, Akira; Kurose, Ryoichi

doi:10.1115/1.4037099

Cited by 23 publications

(15 citation statements)

References 7 publications

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“…This SGS model is chosen because its formulation promotes the near-wall scaling and vanishing due to turbulence damping properties of the no-slip wall boundary condition. A Non-Adiabatic Flamelet/Progress-Variable (NA-FPV) approach [11,12] wherein the influence of heat loss due to cooled wall, latent heat of evaporation of fuel droplets and liquid fuel film formed on the wall surface, and radiative heat transfer, on the variation of each physical quantity can be accounted for, is employed as the combustion model for n-dodecane in the LESs and DNS. The diffusion flamelet database is generated using FlameMaster [13] by solving the flamelet equations for 1-D counter diffusion flame, using a detailed chemical kinetics mechanism of n-dodecane consisting of 255 chemical species and 2289 reactions [14].…”

Section: Computational Details and Model Formulationmentioning

confidence: 99%

Assessment of LES for Investigating Spray Flame Impinging on a Wall under Compression-Ignition Engine-like Environment

Pillai

Kai

et al. 2021

ICLASS

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The applicability of Large-Eddy Simulation (LES) for analysing the phenomenon of turbulent spray flame impinging on a wall, under Compression-Ignition (CI) engine-like environment is assessed. The fuel spray is n-dodecane whose turbulent combustion is modelled using a Non-Adiabatic Flamelet/Progress-Variable (NA-FPV) approach. LESs are based on a Eulerian-Lagrangian framework and the sigma sub-grid turbulence model is used to calculate the subgrid scale (SGS) turbulent viscosity. Dynamics of liquid fuel film formed on the wall surface are captured using a particle-based framework. To couple the convective and radiative heat transfer at the wall surface, with the conduction heat transfer within the finite thickness solid wall, Conjugate Heat Transfer (CHT) is incorporated. LESs are performed with and without SGS models using different mesh resolutions, and the results are compared with those of a Direct Numerical Simulation (DNS). Application of sub-grid turbulence models is found to be crucial for accurate predictions of ignition delay time, flame lift-off length, wall heat flux, and other statistical quantities. It is demonstrated that LES can be successfully applied for reproducing the characteristics of turbulent spray flame, and its interaction with a wall upon impingement, while achieving 5 -6 times speed-up in computational performance compared to DNS.

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Section: Computational Details and Model Formulationmentioning

confidence: 99%

Assessment of LES for Investigating Spray Flame Impinging on a Wall under Compression-Ignition Engine-like Environment

Pillai

Kai

et al. 2021

ICLASS

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“…Hossain et al [25] avoided unrealistically low temperatures by slightly modifying the fuel composition at the boundaries and achieved a realistic temperature without changing the solution domain. On the other hand, Kishimoto et al [26] modified the source term in the energy equations and obtained flamelet data covering a wide range of enthalpy defects. In this method, the heat loss became larger in the hightemperature zone and smaller in the low-temperature zone near the boundary; therefore, the temperature dependence of the enthalpy defect yielded realistic heat loss in the solution domain.…”

Section: Additional Dimension For Heat Transfer Between the Gas Phase And Dispersed Phasementioning

confidence: 99%

Analysis of flame structure using detailed chemistry and applicability of flamelet/progress variable model in the laminar counter-flow diffusion flames of pulverized coals

Akaotsu

Matsushita

Aoki

et al. 2020

Advanced Powder Technology

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Pulverized coal is still found in many practical devices even though it is recognized as "dirty fuel" because of its CO 2 and pollutant emissions. To overcome this problem, advanced coal utilization technologies have been developed using numerical simulations. In this study, the structures of the laminar counter-flow diffusion flames of pulverized coals were investigated by performing simulations based on detailed chemistry. The high-temperature region became narrower as the coal/air ratio increased, because of the departure from the stoichiometric mixture and local quenching by the heat transfer between the gas and solid phases. Further, the applicability of the flamelet/progress-variable (FPV) model was investigated through a priori and a posteriori tests. The a priori test confirmed that the FPV model is capable of reproducing the numerical solutions obtained using the detailed chemistry, including the mass fractions of minor

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“…However, the conventional FGM has th the reaction is basically stored in adiabatic conditions, so that the effect of heat loss on the change in the composition of chemical species cannot be considered. In this study, therefore, a non-adiabatic procedure, which was proposed by Kishimoto et al [23] for generating non-premixed flamelet libraries that consider the effects of heat losses based on the flamelet/progress-variable approach [24], is employed for generating the premixed flamelet library. The calculations of the one-dimensional free-propagating flames for generating the premixed flamelet libraries for the FGM and NA-FGM are conducted by using…”

Section: Les/na-fgmmentioning

confidence: 99%

“…FrontFlow/Red extended by some research institutes, including Kyoto University, referred to as FFR-Comb [23,27,28]. Previously, the NA-FPV was implemented to the LES solver and the accuracy of non-adiabatic procedure is validated [23]. In this study, the NA-FGM is newly implemented to the code.…”

Section: Computational Detailsmentioning

confidence: 99%

Predictions of NO and CO emissions in ammonia/methane/air combustion by LES using a non-adiabatic flamelet generated manifold

Honzawa

Kai

Okada

et al. 2019

Energy

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A large-eddy simulation (LES) employing a non-adiabatic flamelet generated manifold approach, which can account for the effects of heat losses due to radiation and cold walls, is applied to NH 3 /CH 4 /air combustion fields generated by a swirl burner, and the formation mechanisms of NO and CO for ammonia combustion are investigated in detail. The amounts of NO and CO emissions for various equivalence ratios, are compared with those predicted by LES employing the conventional adiabatic flamelet generated manifold approach and measured in the bespoke experiments. The results show that the amounts of NO and CO emissions predicted by the large-eddy simulations with the non-adiabatic flamelet generated manifold approach agree well with the experiments much better than the ones with the adiabatic flamelet generated manifold approach. This is because the NO and CO reactions for NH 3 /CH 4 /air combustion are quite susceptible to H and OH radicals concentrations and gas temperature. This suggests that it is essential to take into account the *Revised Manuscript with No Changes Marked Click here to view linked References 2 effects of various heat losses caused by radiation and cold walls in predicting the NO and CO emissions for the combustion of ammonia as a primary fuel.

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Application of a Nonadiabatic Flamelet/Progress-Variable Approach to Large-Eddy Simulation of H2/O2 Combustion Under a Pressurized Condition

Cited by 23 publications

References 7 publications

Assessment of LES for Investigating Spray Flame Impinging on a Wall under Compression-Ignition Engine-like Environment

Assessment of LES for Investigating Spray Flame Impinging on a Wall under Compression-Ignition Engine-like Environment

Analysis of flame structure using detailed chemistry and applicability of flamelet/progress variable model in the laminar counter-flow diffusion flames of pulverized coals

Predictions of NO and CO emissions in ammonia/methane/air combustion by LES using a non-adiabatic flamelet generated manifold

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