Modelling Turbulent Combustion Coupled with Conjugate Heat Transfer in OpenFOAM

Abbassi, M. El; Lahaye, Domenico; Vuik, Kees

doi:10.1007/978-3-030-55874-1_113

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…As mentioned in the introduction, the application of the conjugate heat transfer (CHT) method is a viable approach for accurately predicting the thermal boundary conditions of the furnace walls. In general, the CHT method is an integrated approach that addresses the thermal behavior within both the fluid and solid domains simultaneously . It determines the temperature distribution across the fluid–solid interface through thermal coupling between these two domains.…”

Section: Experimental Apparatus and Numerical Methodologymentioning

confidence: 99%

“…In general, the CHT method is an integrated approach that addresses the thermal behavior within both the fluid and solid domains simultaneously. 23 It determines the temperature distribution across the fluid−solid interface through thermal coupling between these two domains. As for the governing equations in the solid domain, only energy transfer needs to be resolved.…”

Section: Numerical Approach 231 Description Of Modelmentioning

confidence: 99%

“…The conjugate heat transfer (CHT) method, which considers the thermal interactions between solid and fluid domains, has recently been acknowledged as an effective approach for representing thermal boundary conditions in combustion simulations. 23 However, much of the current literature on ammonia combustion furnace simulations primarily focuses only on the flow field in the fluid domain, often overlooking the crucial heat transfer processes between fluid and solid domains. That is, wall boundary conditions are typically approximated using fixed temperature or heat flux densities, which can deviate significantly from the actual operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In numerical analysis of combustion furnaces, a critical aspect is the precise estimation of thermal boundary conditions on furnace walls, as this significantly impacts the prediction accuracy of temperature and species distribution. The conjugate heat transfer (CHT) method, which considers the thermal interactions between solid and fluid domains, has recently been acknowledged as an effective approach for representing thermal boundary conditions in combustion simulations . However, much of the current literature on ammonia combustion furnace simulations primarily focuses only on the flow field in the fluid domain, often overlooking the crucial heat transfer processes between fluid and solid domains.…”

Section: Introductionmentioning

confidence: 99%

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Toward the Development of Low-NO Ammonia Cofiring Furnaces: Numerical Investigation into the Secondary Injection System Using the Conjugate Heat Transfer Method

Yang,

Hori,

Sawada

et al. 2024

Energy Fuels

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In the context of utilizing ammonia for cofiring power generation, the air-staged strategy is recognized as an effective method for controlling NO emissions due to its ability to stage air input, thereby creating a fuel-rich region within the furnace. To explore the NO formation and reduction characteristics employing the secondary injection system under various experimental conditions, the present study utilized three-dimensional numerical simulations to investigate the impact of the primary air ratio (λ1) and the secondary nozzle diameter (D 2). The conjugate heat transfer method is used to accurately simulate thermal conditions at the furnace walls. Results indicate that with a constant total air ratio of 1.2, simply reducing the primary air ratio, which enhances fuel-rich combustion in the primary air zone, does not lead to a linear decrease in NO emissions. Instead, NO emissions exhibit a V-shaped trend, reaching a minimum when the primary air ratio equals 0.6. An analysis of combustion characteristics reveals two distinct combustion modes appear as the primary air ratio varies, which is the primary reason for this phenomenon. When λ1 ≥ 0.6, as fuel and most of the oxidizers are injected through the primary nozzle, reactions are predominantly concentrated in the primary air region of the furnace where the reaction temperatures are higher. The formation of a fuel-rich region in this central zone leads to a notable decline in NO emissions. Conversely, when λ1 < 0.6, the flow from the secondary nozzle increases, shifting the main combustion reactions toward the secondary air zone, where the flame temperature significantly decreases. In these conditions, the main reactions do not occur in the fuel-rich region of the primary air zone, leading to a trend where NO emissions increase again as the primary air ratio decreases. Regarding the impact of the secondary nozzle diameter at lower ammonia cofiring ratios, results demonstrate that increasing the nozzle size enhances reduction reactions and controls NO emissions. These findings provide insights for the parameter design and selection of low-NO ammonia cofiring furnaces in future studies.

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Section: Experimental Apparatus and Numerical Methodologymentioning

confidence: 99%

Section: Numerical Approach 231 Description Of Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Toward the Development of Low-NO Ammonia Cofiring Furnaces: Numerical Investigation into the Secondary Injection System Using the Conjugate Heat Transfer Method

Yang,

Hori,

Sawada

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

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“…All simulations have been conducted using an in-house solver based on the libraries available in the open-source software OpenFOAM-v2006. A new solver was developed based on the conjugate solver chtMultiRegionFoam, described by Abbassi et al [24]. This solver uses a cell-centred finite volume scheme in both the solid and fluid domains.…”

Section: Methodology 21 Numerical Solvermentioning

confidence: 99%

Conjugate Modeling of a Closed Co-Rotating Compressor Cavity

Parry,

Tang,

Scobie

et al. 2023

Journal of Engineering for Gas Turbines and Power

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Robust methods to predict heat transfer are vital to accurately control the blade-tip clearance in compressors and the radial growth of the discs to which these blades are attached. Fundamentally, the flow in the cavity between the co-rotating discs is a conjugate problem: the temperature gradient across this cavity drives large-scale buoyant structures in the core that rotate asynchronously to the discs, which in turn governs the heat transfer and temperature distributions in the discs. The practical engine designer requires expedient computational methods and low-order modelling. A conjugate heat transfer methodology that can be used as a predictive tool is introduced here. Most simulations for rotating cavities only consider the fluid domain in isolation and typically require known disc temperature distributions as the boundary condition for the solution. This paper presents a novel coupling strategy for the conjugate problem, where unsteady Reynolds Averaged Navier-Stokes (URANS) simulations for the fluid are combined with a series of steady simulations for the solid domain in an iterative approach. This strategy overcomes the limitations due to the difference in thermal inertia between fluid and solid; the method retains the unsteady flow features but allows a prediction of the disc temperature distributions, rather than using them as a boundary condition. This approach has been validated on the fundamental flow configuration of a closed co-rotating cavity. Metal temperatures and heat transfer correlations predicted by the simulation are compared to those measured experimentally for a range of engine-relevant conditions.

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