Advances and challenges in modeling high-speed turbulent combustion in propulsion systems

Gonzalez-Juez, Esteban D.; Kerstein, Alan R.; Ranjan, Reetesh; Menon, Suresh

doi:10.1016/j.pecs.2016.12.003

Cited by 94 publications

(30 citation statements)

References 206 publications

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“…Success in modeling combustion chemistry is dependent upon the reliability of the chemical kinetic model used. Modeling of the small-scale system with detailed reaction mechanisms is necessary [72,73] to accurately describe the catalytic combustion process, and to accurately capture the combustion characteristics such as the formation of pollutant species. The influence of nitrogen in a high temperature environment must also be accounted for.…”

Section: Detailed Chemical Kinetic Modelmentioning

confidence: 99%

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Chen

Gao

2018

Catalysts

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The catalytic combustion characteristics of methane-air mixtures in small-scale systems were investigated at elevated temperatures, with particular emphasis on identifying the main factors that affect formation and removal of combustion-generated pollutants. Computational fluid dynamics simulations were performed using detailed chemical kinetic mechanisms, and more insights were offered into the phenomena occurring in the temperature range where homogeneous and heterogeneous reaction pathways are both important. Reaction engineering analysis was performed to provide an in-depth understanding of how to achieve low emissions of pollutants. Spatial distributions of the major species involved were presented to gain insight into the interplay between the two competing pathways involved. The results indicated that the distribution of oxidized products depends critically on the feed composition, dimension, temperature, and pressure. Small-scale catalytic systems enable low emissions of pollutants even in a high temperature environment, along with high combustion efficiency. The interplay between the two competing pathways via radicals is strong, and the heterogeneous pathway can significantly inhibit the homogeneous pathway. The inhibiting effect also accounts for the low emissions of nitrogen oxides. Almost all of the nitrogen oxides emitted by small-scale catalytic systems are nitric oxide. Catalytic combustion technology can be used to reduce the formation of undesired products, especially pollutant nitrogen oxide gases far below what can be achieved without catalysts. Recommendations for the design of small-scale catalytic systems are provided.

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Section: Detailed Chemical Kinetic Modelmentioning

confidence: 99%

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Chen

Gao

2018

Catalysts

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“…Computational fluid dynamics integrated with detailed kinetic models is an effective tool for revealing the physical and chemical phenomena involved in the reaction process and subsequently understanding the underlying mechanism [51,52]. In the following sections, a two-dimensional computational fluid dynamics model with detailed chemistry and transport is developed in order to accurately describe the low-temperature catalytic oxidation process of syngas over platinum.…”

Section: Model Developmentmentioning

confidence: 99%

Catalytic Oxidation of Synthesis Gas on Platinum at Low Temperatures for Power Generation Applications

et al. 2018

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This paper addresses the issues related to the low-temperature catalytic oxidation of synthesis gas at high pressures under lean-burn conditions. The purpose of this study is to explore the mechanism responsible for the interplay between carbon monoxide and hydrogen during their combined oxidation process. Particular attention is given to the temperature range from 500 to 770 K, which is relevant to the catalyst inlet temperature encountered in catalytic combustion gas turbine systems. Computational fluid dynamics simulations were performed by using a numerical model with detailed chemistry and transport. Reaction path analysis was conducted, and the rate-determining step in the reaction mechanism was finally identified. It was shown that there is a strong interplay between carbon monoxide and hydrogen during the combined oxidation process. The addition of hydrogen causes a great change in the adsorbed species on the surface of the catalyst. At temperatures as low as 600 K, the presence of hydrogen makes the active surface sites more available for adsorption, thus promoting the catalytic oxidation of carbon monoxide. The coupling steps between the two components make a small contribution to the promoting effect. At temperatures below 520 K, the presence of hydrogen inhibits the catalytic oxidation of carbon monoxide due to the competitive effect of hydrogen on oxygen adsorption.

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“…In contrast, CFD approaches for engineering problems approximate the above physics with turbulent combustion models. There are numerous turbulent combustion models available [2,3] and several studies have compared them [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Subgrid Reaction-Diffusion Closure for Large Eddy Simulations Using the Linear-Eddy Model

Arshad

Gonzalez-Juez

Dasgupta

et al. 2019

Flow Turbulence Combust

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Turbulent combustion models approximate the interaction between turbulence, molecular transport and chemical reactions. Among the many available turbulent combustion models, the present focus is the linear-eddy model (LEM) used as a subgrid combustion model for large eddy simulations. In particular this paper introduces a new LEM closure with the reaction-rate approach to close the filtered chemical source terms in the governing equations for species mass fractions and enthalpy. The new approach is tested using a nonpremixed syngas flame and a bluff-body stabilized premixed flame problem. Simulation results are compared to data from a direct numerical simulation and experiments. This comparison shows that mean and rms quantities compare well with experiments and are in the range of previous simulation studies. These results are obtained with a pressure-based and unstructured computational-fluid-dynamics solver, an approach that is preferred in industry. Keywords Turbulent combustion model • Large eddy simulations • Linear-eddy model • Chemical source term closure • Bluff-body stabilized flame • Reacting temporal jet • Splicing

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Advances and challenges in modeling high-speed turbulent combustion in propulsion systems

Cited by 94 publications

References 206 publications

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

RETRACTED: Catalytic Combustion Characteristics of Methane-Air Mixtures in Small-Scale Systems at Elevated Temperatures

Catalytic Oxidation of Synthesis Gas on Platinum at Low Temperatures for Power Generation Applications

Subgrid Reaction-Diffusion Closure for Large Eddy Simulations Using the Linear-Eddy Model

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