SOOT AND RADIATION PROPERTIES OF BUOYANT TURBULENT DIFFUSION FLAMES (FLAMES). PDF Download
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Author: YUDAYA RAJU SIVATHANU
Publisher:
ISBN:
Category :
Languages : en
Pages : 230
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Book Description
correlations in flames, suggesting a strong relationship between soot and turbulence properties in these flames required for the existence of soot volume fraction state relationships. Instantaneous measurements of soot volume fractions and mixture fractions are needed to evaluate this concept fully.
Author: YUDAYA RAJU SIVATHANU
Publisher:
ISBN:
Category :
Languages : en
Pages : 230
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Book Description
correlations in flames, suggesting a strong relationship between soot and turbulence properties in these flames required for the existence of soot volume fraction state relationships. Instantaneous measurements of soot volume fractions and mixture fractions are needed to evaluate this concept fully.
Author: Z. Dai
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 48
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Book Description
Two aspects of unwanted fires were considered: (1) the optical properties of soot in the fuel-lean region of buoyant turbulent diffusion flames, and (2) the structure and mixing properties of buoyant turbulent plumes. The scattering, absorption and extinction properties of soot were measured for conditions where soot structure was known from earlier transmission electron microscopy measurements. The measurements were compared with predictions based on the Rayleigh-Debye-Gans (RDG) scattering approximation for polydisperse fractal aggregates.
Author: Building and Fire Research Laboratory (U.S.)
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 85
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Present measurements emphasized self-preserving conditions far from the source where effects of source momentum and other source disturbances have been lost. The results show that earlier measurements in the literature were not carried out at sufficient distances from the source to reach self-preserving conditions, and provide measured properties at self-preserving conditions needed to develop and evaluate higher-order models of buoyant turbulent flows. The measurements were used to evaluate a simple k-E-g turbulence model finding good agreement between measured and predicted mean velocities and mixture fractions based on standard turbulence model constants, which is not unusual for a simple classical flow like the self-preserving buoyant turbulent plume.
Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 75
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Book Description
Study investigates the radiation and mixing properties of buoyant turbulent diffusion flames, specifically the optical and radiative properties of soot and the structure and mixing properties of buoyant turbulent plumes.
Author: Yudaya Raju Sivathanu
Publisher:
ISBN:
Category : Gas-turbines
Languages : en
Pages : 213
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: San-Mou Jeng
Publisher:
ISBN:
Category : Dwellings
Languages : en
Pages : 237
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
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.
![Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames PDF](https://books.google.com/books/content/images/frontcover/R1110AEACAAJ?fife=w80-h100)
Author: Z. Dai
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 0
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Book Description
![Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames PDF](https://books.google.com/books/content/images/frontcover/EcQJtwAACAAJ?fife=w80-h100)
Author: Z. Dai
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 85
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Book Description
