Soot Formation in Gaseous Laminar Diffusion Flames PDF Download
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Author: Changlie Wey
Publisher:
ISBN:
Category : Soot
Languages : en
Pages : 386
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Book Description
Author: Changlie Wey
Publisher:
ISBN:
Category : Soot
Languages : en
Pages : 386
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Book Description
Author: Margaret Kathleen Bohan
Publisher:
ISBN: 9780494210062
Category : Combustion
Languages : en
Pages : 150
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Book Description
Understanding the factors that effect soot formation is essential to development of predictive models and the design of combustion processes that reduce the formation of particulates. Synergistic effects in flames of gas mixtures, increases in soot volume fraction that are higher than would be expected based on the soot volume fractions in the pure gas flames, have been observed in previous studies. The two isomers of butane were chosen to eliminate changes in flame carbon content, mass flow rate, and adiabatic flame temperature that are normally encountered when comparing flames of pure gases to flames of gas mixtures, and which also effect soot formation. A co-flow annular burner and a line-of-sight attenuation apparatus were used to produce radially-resolved soot volume fraction measurements. The experimental results give further insight into the sooting propensities of isobutane and n-butane, as well as their effect soot formation in ethylene and methane flames.
Author: Henning Bockhorn
Publisher: Springer Science & Business Media
ISBN: 3642851673
Category : Science
Languages : en
Pages : 595
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Book Description
Soot Formation in Combustion represents an up-to-date overview. The contributions trace back to the 1991 Heidelberg symposium entitled "Mechanism and Models of Soot Formation" and have all been reedited by Prof. Bockhorn in close contact with the original authors. The book gives an easy introduction to the field for newcomers, and provides detailed treatments for the specialists. The following list of contents illustrates the topics under review:
Author: Guozheng Lin
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 568
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Author: Ahmet Emre Karatas
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Book Description
Arclength continuation methods were incorporated into a code for predicting the structure of sooting, opposed-jet flames. The code includes complex chemistry, detailed particle dynamics, particle chemistry and radiation. The code was used to predict soot production over a wide variation in strain rates for both ethylene/air and methane/air diffusion flames. Predicted values (both peak and spatial distributions) agree well with experimental measurements in ethylene flames. Particle size distributions are also predicted using the aerosol equations from MAEROS, but no data is available for comparison. Also, the soot dynamical equations were imbedded into a separate code to describe soot production in a coflow, laminar, diffusion flame which includes treatment of detailed, gas phase chemistry. Predictions were compared to measurements made in a methane, coflow flame. Reasonable agreement between the predictions and measurements was obtained, although a factor of three underprediction of the soot volume fractions is likely due to uncertainties in inlet conditions and an inability to match closely bulk flame parameters such as temperature. Predicted peak soot production occurred around 1720K and particle oxidation was dominated by superequilibrium concentrations of hydroxyl radicals. Several PAH-forming sequences were examined and compared to the traditional acetylene-addition sequence. A sequence involving benzyl-propargyl combination was found to compete with the traditional mechanism and it should be included in future analyses. The algorithms for treating sectional soot dynamics and growth/oxidation rates were modified to include effects at high pressure. Continuum effects and limitations to gaseous diffusion were included in the opposed jet code. Predicted variations in soot production due to pressure changes from 4 to 10 atmospheres were made for an ethylene-air.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
An investigation of soot formation in laminar diffusion flames showed that soot particle surface growth under laminar diffusion flame conditions ceases because of the depletion of hydrocarbon species and not soot particle reactivity loss due to thermal aging of the particles. This result was obtained through direct species concentration measurements under well-controlled conditions, while the particle reactivity effects were calculated based on premixed flame results along with particle temperature/time information available from earlier laminar diffusion flame studies. Comparisons with a soot formation model which incorporated detailed chemistry effects showed good agreement in terms of predicted and measured species concentration and soot particle field evolution. In addition, a novel technique for measuring soot volume fraction was developed based on laser-induced incandescence and was successfully applied to similar laminar diffusion flame studies. This technique was extended to droplet and turbulent diffusion flame conditions where a two-dimensional imaging approach was employed to measure soot volume fraction. Finally, the complete data set from these studies was assembled in a form suitable for dissemination on computer diskettes throughout the research community for comparison with modeling efforts.
Author: Adel Maurice Iskander
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 440
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Author: Peter Bradford Sunderland
Publisher:
ISBN:
Category :
Languages : en
Pages : 262
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Author: eO L. Geulder
Publisher:
ISBN:
Category :
Languages : en
Pages :
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