Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Fluid Dynamics
Volume 58, Number 18
Sunday–Tuesday, November 24–26, 2013; Pittsburgh, Pennsylvania
Session E26: Reacting Flows III: Coal & Soot |
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Chair: Babak Shotorban, The University of Alabama in Huntsville Room: 321 |
Sunday, November 24, 2013 4:45PM - 4:58PM |
E26.00001: Transported PDF modeling for pulverized coal combustion Xinyu Zhao, Daniel C. Haworth A transported probability density function (PDF) method has been applied to the simulation of pulverized coal combustion. A Lagrangian particle/Eulerian mesh algorithm has been employed to treat the gas phase. An independent set of Lagrangian parcels are used to model the solid phase (pulverized coal). The two phases are coupled by particle-source-in-cell technique and by source term redistribution models. Other high-fidelity models, such as photon Monte Carlo radiation model, are integrated into the PDF-coal framework. Temperature and global characteristics of coal combustion are compared with experimental data. Sensitivities of the results to model variations are explored. [Preview Abstract] |
Sunday, November 24, 2013 4:58PM - 5:11PM |
E26.00002: A Study of Turbulence-Chemistry-Soot-Radiation Interaction in Luminous Turbulent Jet Flames Somesh Roy, Daniel Haworth A detailed soot model based on method of moments with interpolative closure (MOMIC) is used in RANS simulations of luminous turbulent jet flames using OpenFOAM. A detailed chemical mechanism has been used to describe the chemistry of key soot precursors, and a transported probability density function (tPDF) method has been used to capture the turbulence-chemistry-soot-radiation interactions. The results from the detailed soot model have been compared with those from a semi-empirical, two-equation soot model for accuracy and performance. The effects of turbulence-chemistry-radiation interactions on soot dynamics are isolated and quantified. [Preview Abstract] |
Sunday, November 24, 2013 5:11PM - 5:24PM |
E26.00003: Large-eddy simulation of pulverized coal swirl jet flame Masaya Muto, Hiroaki Watanabe, Ryoichi Kurose, Satoru Komori, Saravanan Balusamy, Simone Hochgreb Coal is an important energy resource for future demand for electricity, as coal reserves are much more abundant than those of other fossil fuels. In pulverized coal fired power plants, it is very important to improve the technology for the control of environmental pollutants such as nitrogen oxide, sulfur oxide and ash particles including unburned carbon. In order to achieve these requirements, understanding the pulverized coal combustion mechanism is necessary. However, the combustion process of the pulverized coal is not well clarified so far since pulverized coal combustion is a complicated phenomenon in which the maximum flame temperature exceeds 1500 degrees Celsius and some substances which can hardly be measured, for example, radical species and highly reactive solid particles are included. Accordingly, development of new combustion furnaces and burners requires high cost and takes a long period. In this study, a large-eddy simulation (LES) is applied to a pulverized coal combustion field and the results will be compared with the experiment. The results show that present LES can capture the general feature of the pulverized coal swirl jet flame. [Preview Abstract] |
Sunday, November 24, 2013 5:24PM - 5:37PM |
E26.00004: Damk\"ohler number effects on soot formation and growth in turbulent nonpremixed flames Fabrizio Bisetti, Antonio Attili, Michael E. Mueller, Heinz Pitsch An analysis of soot formation and growth, based on a set of large simulations of n-heptane/air turbulent nonpremixed combustion, is presented. A detailed chemical mechanism, which includes polycyclic aromatic hydrocarbons, and a high-order method of moments for soot modeling are employed for the first time in the three-dimensional simulation of turbulent sooting flames. The effects of scalar dissipation rate on the soot growth are studied performing three simulations at different Damk\"ohler number while holding the Reynolds number constant. The temperature field is unchanged by the rescaling, due to negligible extinction in all cases. Soot precursors are more sensitive to strain than temperature and their peak concentration decreases by about $40\%$ and $80\%$ as the Damk\"ohler number is reduced by a factor of $2$ and $4$. It is shown that decreasing the Damk\"ohler number does not affect the soot number density, while the soot mass fraction shows a linear dependence on Damk\"ohler number. [Preview Abstract] |
Sunday, November 24, 2013 5:37PM - 5:50PM |
E26.00005: Monte Carlo Simulation Of Soot Evolution along Lagrangian Trajectories in a Turbulent Flame Ahmed Abdelgadir, Kun Zhou, Antonio Attili, Fabrizio Bisetti A newly developed Monte Carlo method is used to simulate soot formation and growth in a turbulent n-heptane/air flame. The Monte Carlo method is used to simulate the soot evolution along selected Lagragnian trajectories obtained from a direct numerical simulation of a turbulent sooting jet flame [Attili \textit {et al}., Direct and Large-Eddy Simulation 9, Springer, 2013] based on a high-order method of moments. The method adopts an operator splitting approach, which splits the deterministic processes (nucleation, surface growth and oxidation) from coagulation, which is treated stochastically. The purpose of this work is to assess the solution based on the moment method and to investigate the soot particle size distribution (PSD) that is not available in methods of moments. Nucleation and coagulation have the greatest effect on the PSD, therefore, various coagulation models are considered. Along each trajectory, one or more rapid nucleation events occur, affecting the shape of the PSD. It is shown that oxidation and surface growth affect the PSD quantitatively, but do not change the shape significantly. [Preview Abstract] |
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