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Author : R. Baldwin
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (618 download)
Download or read book A Theoretical Model of Buoyant Diffusion Flames written by R. Baldwin and published by . This book was released on 1965 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bifen Wu
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book High-Fidelity Modeling of Buoyancy-Driven Diffusion Flames Towards Fire Suppression written by Bifen Wu and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Buoyancy-driven diffusion flames have been widely studied as a canonical fire configuration due to practical and scientific interests. Numerical investigations are conducted in this dissertation to improve understandings of interactions and couplings among turbulence, chemistry, soot, and multiphase radiation in buoyancy-driven diffusion flames. A high-fidelity modeling framework based on OpenFOAM-5.x, including detailed models for chemistry, radiation, and soot, is developed to improve the numerical accuracy and the computational efficiency with scale-resolved simulations. A Monte Carlo ray tracing (MCRT) based radiation solver coupled with line-by-line databases is developed to describe gas and soot radiation. Detailed and efficient radiation models for water mists are developed and coupled with the MCRT solver. An adaptive hybrid integration chemistry solver is implemented to speed up finite-rate chemistry integration. A semi-empirical two-equation soot model is incorporated to describe soot dynamics. The developed multi-physical platform is systematically verified through a series of combustion-radiation systems including a laminar ethylene diffusion flame and four laminar methane diffusion flames with good agreement. The developed platform is subsequently employed to investigate a laboratory-scale turbulent pool fire. Good agreement with experiments on radiative heat fluxes, and with theories on flame temperature, velocity and puffing frequency, is achieved. Detailed investigations on interactions among chemistry, soot, radiation, and turbulence are performed to gain physical insights on modeling chemistry, soot and radiation. Drawn on the database from high-fidelity pool fire simulations, three physics-based reduced-order models including a flamelet model considering re-absorption, an optimized two-step mechanism for chemistry, and a simple soot model based on the laminar smoke point concept, are developed. Encouraging results are obtained using the reduced-order models with considerable savings in computational cost. Finally, to investigate radiative attenuation of water mists in fire suppression, a radiation model considering anisotropic scattering for water mists is developed and validated against theoretical values, and is adopted to obtain benchmark results for development of reduced-order radiation models.
Author : D. Charnley
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (597 download)
Download or read book Radiating Flamelet Models of Turbulent Buoyant Diffusion Flames written by D. Charnley and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S-M. Jeng
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Download or read book An Investigation of Axisymmetric Buoyant Turbulent Diffusion Flames: Flow Structure and Radiation Properties written by S-M. Jeng and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. H. Thomas
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (618 download)
Download or read book On the Size and Orientation of Buoyant Diffusion Flames and the Effect of Wind written by P. H. Thomas and published by . This book was released on 1963 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Howard D. Ross
Publisher : Elsevier
ISBN 13 : 0080549977
Total Pages : 601 pages
Book Rating : 4.0/5 (85 download)
Download or read book Microgravity Combustion written by Howard D. Ross and published by Elsevier. This book was released on 2001-09-03 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an introduction to understanding combustion, the burning of a substance that produces heat and often light, in microgravity environments-i.e., environments with very low gravity such as outer space. Readers are presented with a compilation of worldwide findings from fifteen years of research and experimental tests in various low-gravity environments, including drop towers, aircraft, and space.Microgravity Combustion is unique in that no other book reviews low- gravity combustion research in such a comprehensive manner. It provides an excellent introduction for those researching in the fields of combustion, aerospace, and fluid and thermal sciences. * An introduction to the progress made in understanding combustion in a microgravity environment* Experimental, theoretical and computational findings of current combustion research* Tutorial concepts, such as scaling analysis* Worldwide microgravity research findings
Author : Graham Christopher Fleming
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (436 download)
Download or read book Structure and Stability of Buoyant Diffusion Flames written by Graham Christopher Fleming and published by . This book was released on 1982 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shou-Hao Wu
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.:/5 (38 download)
Download or read book Numerical Simulation of Time-dependent Buoyant Diffusion Flames written by Shou-Hao Wu and published by . This book was released on 1991 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zhenghua Yan
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (186 download)
Download or read book Numerical Modeling of Turbulent Combustion and Flame Spread written by Zhenghua Yan and published by . This book was released on 1999 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical models have been developed to address several important aspects of numerical modeling of turbulent combustion and flame spread. The developed models include a pyrolysis model for charring and non-charring solid materials, a fast narrow band radiation property evaluation model (FASTNB) and a turbulence model for buoyant flow and flame. In the pyrolysis model, a completely new algorithm has been proposed, where a moving dual mesh concept was developed and implemented. With this new concept, it provides proper spatial resolution for both temperature and density and automatically considers the regression of the surface of the non-charring solid material during its pyrolysis. It is simple, very efficient and applicable to both charring and non-charring materials. FASTNB speeds up significantly the evaluation of narrow band spectral radiation properties and thus provides a potential of applying narrow band model in numerical simulations of practical turbulent combustion. The turbulence model was developed to improve the consideration of buoyancy effect on turbulence and turbulent transport. It was found to be simple, promising and numerically stable. It has been tested against both plane and axisymmetric thermal plumes and an axisymmetric buoyant diffusion flame. When compared with the widely used standard buoyancy-modified k-e model, it gives significant improvement on numerical results. These developed models have been fully incorporated into CFD (Computational Fluid Dynamics) code and coupled with other CFD sub-models, including the DT (Discrete Transfer) radiation model, EDC (Eddy Dissipation Concept) combustion model, flamelet combustion model, various soot models and transpired wall function. Comprehensive numerical simulations have been carried out to study soot formation and oxidation in turbulent buoyant diffusion flames, flame heat transfer and flame spread in fires. The gas temperature and velocity, soot volume fraction, wall surface temperature, char depth, radiation and convection heat fluxes, and heat release rate were calculated and compared with experimental measurements. In addition to provide comprehensive data for comparison, experiments on room corner fire growth were undertaken, where the gas temperature, solid fuel surface temperature, radiative heat flux, char depth and heat release rate were all measured.
Author : Bernard J. McCaffrey
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (618 download)
Download or read book Purely Buoyant Diffusion Flames written by Bernard J. McCaffrey and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sivakumar Santhanakrishnan
Publisher :
ISBN 13 :
Total Pages : 372 pages
Book Rating : 4.3/5 (91 download)
Download or read book Optical Properties of Soot Emitted from Buoyant Turbulent Diffusion Flames written by Sivakumar Santhanakrishnan and published by . This book was released on 2000 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. H. Thomas
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (618 download)
Download or read book Buoyant Diffusion Flames written by P. H. Thomas and published by . This book was released on 1964 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : San-Mou Jeng
Publisher :
ISBN 13 :
Total Pages : 237 pages
Book Rating : 4.:/5 (192 download)
Download or read book An Investigation of Structure and Radiation Properties of Turbulent Buoyant Diffusion Flames written by San-Mou Jeng and published by . This book was released on 1984 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S-M. Jeng
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (5 download)
Download or read book An Investigation of Axisymmetric Buoyant Turbulent Diffusion Flames written by S-M. Jeng and published by . This book was released on 1982 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation considered measurements of the structure of axisymmetric, buoyant, turbulent diffusion flames in still air. Profiles of mean temperature, mean velocity, velocity fluctuations and total radiant heat flux were completed for methane flames, including careful characterization of burner exit conditions, in order to provide data for the evaluation of models of the process. Preliminary tests also provided mean temperature profiles for propane flames. Test conditions were chosen so that the flow was turbulent near the burner exit while effects of buoyancy were significant over most of the luminous portion of the flames. Both the present measurements and those of other investigators were compared with predictions of a k-E-g differential model, which included effects of buoyancy in the transport equations for turbulence quantities. The results indicated anisotropic effects in regions where buoyancy dominates flow properties suggesting the eventual desirability of multi-stress models for buoyant flames, although extensive recalibration of model constants from a limited data based would be required if this step were taken. Additional measurements and analysis of methane flames are in progress, in order to investigate the flame radiation properties and provide additional data on turbulence properties needed for model development.
Author : United States. National Bureau of Standards
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (187 download)
Download or read book Radiation from Turbulent Nonluminous and Luminous Diffusion Flames written by United States. National Bureau of Standards and published by . This book was released on 1987 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical and experimental study of the structure and radiation properties of turbulent buoyant diffusion flames is described. The results have application to modeling fires within structures, materials test methods, fire detection, and effects of materials on fire properties. The investigation consists of two phases, as follows: study of effects of turbulence/radiation interactions, considering the properties of nonluminous hydrogen/air diffusion flames; and study of extension of the laminar flamelet concept to soot properties needed to predict radiation from luminous acetylene/air and ethylene/air turbulent diffusion flames. Theory and experiment are considered in both phases of the investigation. Measurements in turbulent hydrogen/air diffusion flames yielded radiation fluctuation intensities of 20-110 percent, providing direct evidence of the importance of turbulence/radiation interactions. A stochastic analysis, based on the laminar flamelet concept, was developed which provided encouraging predictions of mean and fluctuating spectral radiation intensities (average discrepancies between predictions and measurements were roughly 30 percent), as well as temporal power spectral densities of radiation fluctuations. The temporal spectra exhibit energy-containing and inertial regions, very similar to other turbulence properties, although the rate of decay of the spectra with increasing frequency in the inertial region is somewhat greater than observed for scalar fluctuations. Measurements and predictions in the turbulent luminous flames concentrated on scalar properties (particularly soot volume fractions) in the overfire region. Predictions of scalar properties based on the laminar flamelet concept were very encouraging. Direct evaluation of soot volume fraction state relationships for the overfire region was hampered by effects of turbulent fluctuations and experimental uncertainties; nevertheless, within these limitations, soot volume fraction state relationships were nearly universal, and soot generation efficiencies nearly constant, for sufficiently long residence times. However, effects of finite-rate chemistry were noted for short residence time ethylene/air flames, causing spatial variations of soot generation efficiencies in the overfire region. For long residence times, present measurements of soot generation efficiencies were in reasonably good agreement with earlier findings for acetylene/air and ethylene/air diffusion flames.
Author : B. J. McCaffrey
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (847 download)
Download or read book Entrainment and Heat Flux of Buoyant Diffusion Flames. Final Report written by B. J. McCaffrey and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francesco Tamanini
Publisher :
ISBN 13 :
Total Pages : 137 pages
Book Rating : 4.:/5 (618 download)
Download or read book Numerical Model for the Prediction of Buoyancy Controlled, Turbulent Diffusion Flames written by Francesco Tamanini and published by . This book was released on 1975 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
