Sensitivity of Radiation Modeling to Property Estimation Techniques in the Freeboard of Lignite-Fired Bubbling Fluidized Bed Combustors (BFBCs)

Ozen, Guzide; Selçuk, Nevín

doi:10.1080/00102202.2014.883848

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…Solovjov and Webb [26,27] further improved the model for multicomponent gas mixtures including soot particles. SLW model was compared with various nongray models and found to be the best choice with regard to computational time and accuracy [17,[28][29][30][31][32]. Implementation of SLW method in ANSYS FLUENT is not available to date.…”

Section: Introductionmentioning

confidence: 99%

SLW model for computational fluid dynamics modeling of combustion systems: Implementation and validation

Ozen

Selçuk

2016

Numerical Heat Transfer, Part B: Fundamentals

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Spectral Line-Based Weighted Sum of Gray Gases (SLW) model was implemented to Computational Fluid Dynamics (CFD) Solver, ANSYS FLUENT. Discrete Ordinate Method (DOM) available in ANSYS FLUENT was used as Radiative Transfer Equation (RTE) Solver. ANSYS FLUENT with SLW was applied to the prediction of incident heat fluxes for three test problems; two containing isothermal homogenous/nonhomogenous water vapor and one isothermal water vapor/carbon dioxide mixture. Predictive accuracy of SLW in ANSYS FLUENT was assessed by benchmarking its predictions against those of ray tracing (RT) with Statistical Narrow-Band (SNB) and Method of Lines (MOL) solutions of DOM with SLW. Comparisons reveal that the results of CFD code are in good agreement with the benchmark solutions. This finding proves that the use of DOM with SLW in CFD codes would provide more accurate solutions in studies involving gas combustion, where accuracy in spectral radiative properties plays dominant role in heat flux predictions. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

SLW model for computational fluid dynamics modeling of combustion systems: Implementation and validation

Ozen

Selçuk

2016

Numerical Heat Transfer, Part B: Fundamentals

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“…The MOL solution of DOM with SLW for gas and geometric optics approximation for particles is inherited in the computation of the radiative characteristics of the combustor in this study (Ozen and Selçuk, 2014). As solutions of MOL of DOM with SLW for particle laden combustion gases in circulating fluidized bed combustors are not available to date, a 2D (axisymmetric cylindrical coordinate system) radiation code based on the MOL solution of DOM with SLW and geometric optics approximation is developed.…”

Section: Introductionmentioning

confidence: 99%

“…Radiative properties depend on temperature and gas composition as well as composition, shape, size distribution, and concentration of particles. Previous work for an accurate and computationally efficient solution method for RTE and radiative property estimation technique in the dilute zone of fluidized bed combustors revealed that the method of lines (MOL) solution of discrete ordinates method (DOM) coupled with spectral line-based weighted sum of gray gases model (SLW) for gas and geometric optics approximation for particles provides accurate and computationally efficient solutions for wall fluxes and source term distributions in the dilute zone of fluidized bed combustors (Ozen and Selçuk, 2014).…”

Section: Introductionmentioning

confidence: 99%

Radiative Heat Transfer in the Dilute Zone of an Air-Fired Circulating Fluidized Bed Combustor and Its Oxy-Fired Retrofit

Ozen

Aydın

Selçuk

2016

Combustion Science and Technology

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A 2D radiation model based on method of lines (MOL) solution of discrete ordinates method (DOM) coupled with spectral line-based weighted sum of gray gases model (SLW) is developed to predict radiative heat fluxes along the dilute zone of the lignite-fired 150 kW t Middle East Technical University (METU) circulating fluidized bed combustor (CFBC) under both air-fired and oxy-fired conditions. The dilute zone is treated as an axisymmetric cylindrical enclosure containing a non-gray, absorbing-emitting-isotropically scattering medium. Radiative properties of particles are evaluated by using geometric optics approximation. Input data for the radiation model under air-fired conditions is obtained from predictions of a comprehensive model previously developed and benchmarked against measurements on the same CFBC burning low calorific value indigenous lignite with high volatile matter/fixed carbon (VM/FC) ratio in its own ash. Input data for the radiation model under oxy-fired conditions, on the other hand, is provided by the predictions of a model of oxy-fired retrofit of the same test rig. Predictions of the radiation model reveal similar axial radiative heat flux distributions for air-and retrofitted oxy-fired combustion. In an attempt to investigate the effect of particle load, radiative fluxes were calculated with and without the participating effect of particles for the same input data in each case. Predictions are found to be higher with particle load and much less sensitive to higher carbon dioxide concentration under oxy-fired conditions. ARTICLE HISTORY

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“…Zhang et al [12] analyzed the influence of alumina particles in the non-uniform exhaust plume on the infrared radiation characteristics of the exhaust plume with the finite volume method (FVM). Ozen et al [13,14] developed a radiation program based on gas SNBCK model and particle Mie theory, and discussed the infrared radiation characteristics of rocket exhaust plume with and without alumina particles.…”

Section: Introductionmentioning

confidence: 99%

Study of spectral radiation characteristics of solid rocket plume based on an improved SHDOM

Chen,

Li,

Qiang

2023

Third International Computing Imaging Conference (CITA 2023)

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In order to conduct an in-depth study of the spectral radiation characteristics of two-phase flow exhaust plume, this paper proposes a solution algorithm for calculating the spectral radiation characteristics of the two-phase flow exhaust plume based on the traditional spherical harmonic discrete coordinate method and compares the simulation results with the experimental data of the Black Brant sounding rocket exhaust plume. The results show that the infrared spectral radiation characteristics and intensity of the two-phase flow exhaust plume of the rocket simulated in this paper are consistent with the experimental measurements of DRDC, which verifies that the improved spherical harmonic discrete coordinate method is effective and reliable in simulating and calculating the spectral radiation characteristics of the two-phase flow exhaust plume.

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Sensitivity of Radiation Modeling to Property Estimation Techniques in the Freeboard of Lignite-Fired Bubbling Fluidized Bed Combustors (BFBCs)

Cited by 10 publications

References 21 publications

SLW model for computational fluid dynamics modeling of combustion systems: Implementation and validation

SLW model for computational fluid dynamics modeling of combustion systems: Implementation and validation

Radiative Heat Transfer in the Dilute Zone of an Air-Fired Circulating Fluidized Bed Combustor and Its Oxy-Fired Retrofit

Study of spectral radiation characteristics of solid rocket plume based on an improved SHDOM

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