Soot Formation in Annular Non-premixed Laminar Flames of Methane-air at Pressures of 0.1 to 4.0 MPa [microform]

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Publisher : Library and Archives Canada = Bibliothèque et Archives Canada
ISBN 13 : 9780494029565
Total Pages : 592 pages
Book Rating : 4.0/5 (295 download)

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Book Synopsis Soot Formation in Annular Non-premixed Laminar Flames of Methane-air at Pressures of 0.1 to 4.0 MPa [microform] by : Kevin Austen Thomson

Download or read book Soot Formation in Annular Non-premixed Laminar Flames of Methane-air at Pressures of 0.1 to 4.0 MPa [microform] written by Kevin Austen Thomson and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures by : Hyun Il Joo

Download or read book Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures written by Hyun Il Joo and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was conducted using axisymmetric co-flow laminar diffusion flames of methane-air, methane-oxygen and ethylene-air to examine the effect of pressure on soot formation and the structure of the temperature field. A liquid fuel burner was designed and built to observe the sooting behavior of methanol-air and n-heptane-air laminar diffusion flames at elevated pressures up to 50 atm. A non-intrusive, line-of-sight spectral soot emission (SSE) diagnostic technique was used to determine the temperature and the soot volume fraction of methane-air flames up to 60 atm, methane-oxygen flames up to 90 atm and ethylene-air flames up to 35 atm. The physical flame structure of the methane-air and methane-oxygen diffusion flames were characterized over the pressure range of 10 to 100 atm and up to 35 atm for ethylene-air flames. The flame height, marked by the visible soot radiation emission, remained relatively constant for methane-air and ethylene-air flames over their respected pressure ranges, while the visible flame height for the methane-oxygen flames was reduced by over 50 % between 10 and 100 atm. During methane-air experiments, observations of anomalous occurrence of liquid material formation at 60 atm and above were recorded. The maximum conversion of the carbon in the fuel to soot exhibited a strong power-law dependence on pressure. At pressures 10 to 30 atm, the pressure exponent is approximately 0.73 for methane-air flames. At higher pressures, between 30 and 60 atm, the pressure exponent is approximately 0.33. The maximum fuel carbon conversion to soot is 12.6 % at 60 atm. For methane-oxygen flames, the pressure exponent is approximately 1.2 for pressures between 10 and 40 atm. At pressures between 50 and 70 atm, the pressure exponent is about -3.8 and approximately -12 for 70 to 90 atm. The maximum fuel carbon conversion to soot is 2 % at 40 atm. For ethylene-air flames, the pressure exponent is approximately 1.4 between 10 and 30 atm. The maximum carbon conversion to soot is approximately 6.5 % at 30 atm and remained constant at higher pressures.

Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)

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Book Synopsis Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures by :

Download or read book Soot Formation in Non-premixed Laminar Flames at Subcritical and Supercritical Pressures written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was conducted using axisymmetric co-flow laminar diffusion flames of methane-air, methane-oxygen and ethylene-air to examine the effect of pressure on soot formation and the structure of the temperature field. A liquid fuel burner was designed and built to observe the sooting behavior of methanol-air and n-heptane-air laminar diffusion flames at elevated pressures up to 50 atm. A non-intrusive, line-of-sight spectral soot emission (SSE) diagnostic technique was used to determine the temperature and the soot volume fraction of methane-air flames up to 60 atm, methane-oxygen flames up to 90 atm and ethylene-air flames up to 35 atm. The physical flame structure of the methane-air and methane-oxygen diffusion flames were characterized over the pressure range of 10 to 100 atm and up to 35 atm for ethylene-air flames. The flame height, marked by the visible soot radiation emission, remained relatively constant for methane-air and ethylene-air flames over their respected pressure ranges, while the visible flame height for the methane-oxygen flames was reduced by over 50 % between 10 and 100 atm. During methane-air experiments, observations of anomalous occurrence of liquid material formation at 60 atm and above were recorded. The maximum conversion of the carbon in the fuel to soot exhibited a strong power-law dependence on pressure. At pressures 10 to 30 atm, the pressure exponent is approximately 0.73 for methane-air flames. At higher pressures, between 30 and 60 atm, the pressure exponent is approximately 0.33. The maximum fuel carbon conversion to soot is 12.6 % at 60 atm. For methane-oxygen flames, the pressure exponent is approximately 1.2 for pressures between 10 and 40 atm. At pressures between 50 and 70 atm, the pressure exponent is about -3.8 and approximately -12 for 70 to 90 atm. The maximum fuel carbon conversion to soot is 2 % at 40 atm. For ethylene-air flames, the pressure exponent is approximately 1.4 between 10 and 30 atm. The maximu.

High Pressure Soot Formation in Non-smoking Methane-air Laminar Diffusion Flames from 1.5 MPa to 6.0 MPa

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ISBN 13 : 9780494210178
Total Pages : 190 pages
Book Rating : 4.2/5 (11 download)

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Book Synopsis High Pressure Soot Formation in Non-smoking Methane-air Laminar Diffusion Flames from 1.5 MPa to 6.0 MPa by : Marie Emma Vaillancourt

Download or read book High Pressure Soot Formation in Non-smoking Methane-air Laminar Diffusion Flames from 1.5 MPa to 6.0 MPa written by Marie Emma Vaillancourt and published by . This book was released on 2006 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of soot concentration, flame temperature and flame geometry have been recorded for non-smoking methane-air laminar diffusion flames at pressures from P = 1.5 MPa to P = 6.0 MPa. Soot concentration and temperature profiles were obtained using the spectral soot emission diagnostic method and the Abel inversion deconvolution technique. Visual inspection and measurement of the flame revealed a slight increase in height and decrease in cross-section with increasing pressure. Soot volume fraction increased with pressure according to fv max & prop; P1.4 for 1.5 & le; P & le; 5.0 MPa. The maximum carbon conversion to soot was related to pressure following the relationship eta s, max & prop; P0.55 for 1.5 & le; P & le; 5.0 MPa. The maximum value of carbon converted to soot was etas, max = 10.1% at P = 5.0 MPa. The maximum soot concentration was always found at a height approximately half way between the burner and the flame tip. The temperature was lower in high soot loading regions of the flame. For the same height in the flame, temperature decreased with increasing pressure.

Soot Modeling of a Turbulent Non-premixed Methane/air Flame

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Soot Modeling of a Turbulent Non-premixed Methane/air Flame by : Michael I. B. Chai

Download or read book Soot Modeling of a Turbulent Non-premixed Methane/air Flame written by Michael I. B. Chai and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soot is an important air pollutant. Its formation must be modeled accurately to assist designers in development of low soot emission combustors. This study was concerned with the semi-empirical modeling of soot. The models considered inception, coagulation, agglomeration, and oxidation of the soot particles. Since inception is a key process in the development of soot it was studied in great detail. Two approaches to modeling inception were investigated: acetylene and phenyl. For a methane/air coflow diffusion flame at a pressure of one atmosphere both approaches showed good agreement with experimentally observed trends. Furthermore, the acetylene route under predicted the magnitude of the soot volume fraction while the phenyl route over predicted the magnitude of the soot volume fraction. However, it is believed that the phenyl model will perform better with more complex fuels such as kerosene and with improved laminar flamelet libraries that are optimized for C6 species.

Soot Formation in Propane-air Laminar Diffusion Flames at Elevated Pressures [microform]

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Publisher : Library and Archives Canada = Bibliothèque et Archives Canada
ISBN 13 : 9780494024430
Total Pages : 158 pages
Book Rating : 4.0/5 (244 download)

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Book Synopsis Soot Formation in Propane-air Laminar Diffusion Flames at Elevated Pressures [microform] by : Decio S. (Decio Santos) Bento

Download or read book Soot Formation in Propane-air Laminar Diffusion Flames at Elevated Pressures [microform] written by Decio S. (Decio Santos) Bento and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar axisymmetric propane air diffusion flames were studied at pressures 0.1 to 0.725 MPa (1 to 7.25 atm). To investigate the effect of pressure on soot formation, radially resolved soot temperatures and soot volume fractions were deduced from soot radiation emission scans collected at various pressures using spectral soot emission (SSE). Overall flame stability was quite good as judged by the naked eye. Flame heights varied by 15% and flame axial diameters decreased by 30% over the entire pressure range.Analysis of temperature sensitivity to variations in E lambda(m) revealed that a change in E lambda(m) of +/-20% produced a change in local temperature values of about 75 to 100 K or about 5%.Temperatures decreased and soot concentration increased with increased pressure. More specifically, the peak soot volume fraction showed a power law dependence, fv ∝ Pn where n = 2.0 over the entire pressure range. The maximum integrated soot volume fraction also showed a power law relationship with pressure, f ̄v ∝ Pn where n = 3.4 for 1 ≤ P ≤ 2 atm and n = 1.4 for 2 ≤ P ≤ 7.25 atm. The percentage of fuel carbon converted to soot increased with pressure at a rate, etas ∝ Pn where n = 3.3 and n = 1.1 for 1 ≤ P ≤ 2 atm and 2 ≤ P ≤ 7.25 atm respectively.

Soot Measurements in High-Pressure Diffusion Flames of Gaseous and Liquid Fuels

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Publisher :
ISBN 13 : 9780494761816
Total Pages : 208 pages
Book Rating : 4.7/5 (618 download)

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Book Synopsis Soot Measurements in High-Pressure Diffusion Flames of Gaseous and Liquid Fuels by : Gorngrit Intasopa

Download or read book Soot Measurements in High-Pressure Diffusion Flames of Gaseous and Liquid Fuels written by Gorngrit Intasopa and published by . This book was released on 2011 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methane-air, ethane-air, and n-heptane-air over-ventilated co-flow laminar diffusion flames were studied up to pressures of 2.03, 1.52, and 0.51 MPa, respectively, to determine the effect of pressure on flame shape, soot concentration, and temperature. A spectral soot emission optical diagnostic method was used to obtain the spatially resolved soot formation and temperature data. In all cases, soot formation was enhanced by pressure, but the pressure sensitivity decreased as pressure was increased. The maximum fuel carbon conversion to soot, etamax, was approximated by a power law dependence with the pressure exponent of 0.92 between 0.51 and 1.01 MPa, and 0.68 between 1.01 and 2.03 MPa with etamax=9.5% at 2.03 MPa for methane-air flames. For ethane-air flames, the pressure exponent was 1.57 between 0.20 and 0.51 MPa, 1.08 between 0.51 and 1.01 MPa, and 0.58 between 1.01 and 1.52 MPa where etamax=23% at 1.52 MPa. For nitrogen-diluted n-heptane-air flames, etamax=6.5% at 0.51 MPa.

Soot Formation and Its Impact on Flame RadiatioSoot Formation and Its Impact on Flame Radiation During Turbulent Non-Premixed Oxygen-Enriched Combustion of Methane

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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (951 download)

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Book Synopsis Soot Formation and Its Impact on Flame RadiatioSoot Formation and Its Impact on Flame Radiation During Turbulent Non-Premixed Oxygen-Enriched Combustion of Methane by :

Download or read book Soot Formation and Its Impact on Flame RadiatioSoot Formation and Its Impact on Flame Radiation During Turbulent Non-Premixed Oxygen-Enriched Combustion of Methane written by and published by . This book was released on 2015 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures by : Arup Barua

Download or read book Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures written by Arup Barua and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Multi-Scale Investigations in Soot Formation and Chemical Vapor Deposition

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Multi-Scale Investigations in Soot Formation and Chemical Vapor Deposition by : Abhishek Jain

Download or read book Multi-Scale Investigations in Soot Formation and Chemical Vapor Deposition written by Abhishek Jain and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress is made in this thesis in understanding the complex multi-scale chemical and physical processes governing the formation of condensed phase material from gaseous species. The formation of soot through combustion and the synthesis of functional nanomaterial through chemical vapor deposition (CVD) are examined. We first attempt to characterize the sooting tendencies of alternative fuels using different techniques. A new numerical model based on modified flamelet equations is used along with a modified chemical mechanism to predict the effect of fuel molecular structure on soot yield in gasoline surrogates. These simulations provide trends on sooting behavior and are one-dimensional calculations that neglect other phenomenon that govern soot yield and distribution. To determine how other factors influence sooting behavior in laminar flames we carry out experimental and numerical studies to understand how the addition of oxygen to the oxidizer changes soot yield and distribution. Finite-rate chemistry based Direct Numerical Simulations (DNS) are carried out for a series of methane/air flames with increasing Oxygen Index (OI) using an extensively validated, semi-detailed chemical kinetic mechanism, along with an aggregate-based soot model and the results are compared with experimental measurements. It is seen that the effect of variable OI is well captured for major flame characteristics including flame heights, soot yield, and distribution by the numerical simulations when compared to the experimental data. This study is however confined to a small fuel that may not represent behavior seen in real fuels or the constituents that make up these gasoline fuels or their surrogates. Thus, we examine the effects of premixing on soot processes in an iso-octane coflow laminar flame at atmospheric pressure. Iso-octane is chosen as a higher molecular weight fuel as it is an important component of gasoline and its surrogates. Flames at different levels of premixing are investigated ranging from jet equivalence ratios of 1 (non-premixed), 24, 12, and 6. Numerical simulations are compared against experimental measurements and good agreement is seen in soot yield and soot spatial distributions with increasing levels of premixing. While the above studies for soot were carried out for laminar flames combustion devices frequently operate at conditions that lead to turbulent flow. Therefore, to understand how soot is affected by turbulence we computationally study the effects large Polycyclic Atromatic Hydrocarbons species (PAH) have on soot yield and distribution in turbulent non-premixed sooting jet flames using ethylene and and jet fuel surrogate (JP-8). The effects of large PAH on soot are highlighted by comparing the PAH profiles, soot nucleation rate, and soot volume fraction distributions obtained from both simulations for each test flame. Comparisons are also made with experiments when available and further analysis is performed to determine the cause of the observed behavior. Finally, a new multi-scale model is proposed for the computational modeling of the synthesis of functional nanomaterials using CVD. The proposed model is applied to a W(CO)6/H2Se system that has been used by researchers at Penn State to perform WSe2 crystal growth. A force-field for W/C/O/H/Se is developed and favorable agreement is seen when compared to QM data. A reaction mechanism leading from W(CO)6 and H2Se to the crystal precursor is then developed and used in a reacting flow simulation of the custom CVD chamber at Penn State. The bulk reacting flow numerical predictions show promising results for the gas-phase and precursor species, while additional work is still being performed to make the method more robust.

Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames by : Lu-Yin Wang

Download or read book Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames written by Lu-Yin Wang and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soot formation and evolution in relation with the flow fields were investigated experimentally in turbulent swirl-stabilized non-premixed flames using three different fuels: methane, ethanol and aviation Jet A-1. The studied flames were confined and stabilized in a model gas turbine combustor with a swirl number of ~0.55. Soot volume fraction, fv, and primary soot particle size, dp, were measured using auto-compensating laser-induced incandescence, and planar three-component velocity fields were measured using stereoscopic particle image velocimetry. Measurements of planar laser-induced fluorescence of OH and OH* chemiluminescence were also made for methane and ethanol flames. The OH* field was further Abel-inverted to qualitatively locate the heat release zone. The flow field for all flames featured pronounced inner and outer recirculation zones (IRZ, ORZ), each bounded by their corresponding inner and outer shear layers (ISL, OSL). Abel-inverted OH* intensity maps showed that primary reaction zones occurred in the vicinity of ISL. The central fuel jet penetrating into the IRZ accompanied by a stagnation zone was observed in all methane flames. Soot measurements showed that the overall dp for methane and Jet A-1 flames ranged between 30 nm and 60 nm without discernible trends. In methane flames, peak time-averaged fv occurred between the central jet penetration and the ISL. The decrease and the final disappearance of time-averaged fv were strongly correlated with elevated OH, demonstrating a dominant oxidative attack of OH on soot. With a ~7% increase in air flow rate, the level of soot volume fraction dropped by nearly threefold due to enhanced turbulence intermittency. The appearance of ethanol spray flames, which lacked a bright yellow color, largely differed from others. The absence of soot was confirmed in the laser-induced incandescence measurements. The isothermal flow field of ethanol flames exhibited a large-scale structure of precessing vortex core which was then suppressed under reacting conditions. In Jet A-1 flames, spray pattern changed from V-shaped hollow cone to semi-solid cone when air flow rate increased by 20%, resulting in a 60% reduction in peak time-averaged fv. In contrast to results obtained from the methane flame, soot was found primarily outside the ISL where fuel existed in abundance.

Hydrodynamic Effects on Soot Formation in Laminar Hydrocarbon-fueled Diffusion Flames

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ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Hydrodynamic Effects on Soot Formation in Laminar Hydrocarbon-fueled Diffusion Flames by : Guozheng Lin

Download or read book Hydrodynamic Effects on Soot Formation in Laminar Hydrocarbon-fueled Diffusion Flames written by Guozheng Lin and published by . This book was released on 1996 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soot Formation in Ethane-air Coflow Laminar Diffusion Flames at Elevated Pressures

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ISBN 13 : 9780494160565
Total Pages : 198 pages
Book Rating : 4.1/5 (65 download)

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Book Synopsis Soot Formation in Ethane-air Coflow Laminar Diffusion Flames at Elevated Pressures by : Paul Michael Mandatori

Download or read book Soot Formation in Ethane-air Coflow Laminar Diffusion Flames at Elevated Pressures written by Paul Michael Mandatori and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ethane-air laminar coflow non-smoking diffusion flames have been studied at pressures up to 3.34 MPa to determine the effect of pressure on soot formation, flame temperatures and physical flame properties. The spectral soot emission (SSE) diagnostic was used to obtain spatially resolved (both radially and axially) soot volume fraction and soot temperature measurements at pressures of 0.20 to 3.34 MPa. In general, temperature profiles of a given height were found to decrease with increasing pressure. Pressure was found to enhance soot formation with decreased sensitivity as pressures were increased. A power law relation between maximum soot volume fraction and pressure was found to be fvmax & prop;P 2.39 for 0.20 & le; P & le; 1.52 MPa and fvmax & prop;P 1.10 for 1.52 & le; P & le; 3.34 MPa. The integrated line-of-sight soot volume fraction was found to vary as fvline, max & prop;P 2.32 for 0.20 & le; P & le; 0.51 MPa, fvline, max & prop;P 1.44 for 0.51 & le; P & le; 1.52 MPa and fvline, max & prop;P 0.95 for 1.52 & le; P & le; 3.34 MPa. The variation of maximum carbon conversion to soot, as a percentage of the fuel's carbon, was etas, max & prop; P2.23 for 0.20 & le; P & le; 1.13 MPa, etas, max & prop; P1.12 for 0.51 & le; P & le; 1.52 MPa and etas, max & prop; P0.41 for 1.52 & le; P & le; 3.34 MPa. The maximum value of carbon conversion was found to be eta s, max = 27.61% at P = 3.34 MPa.

Soot and Pah Formation in Counterflow Non-premixed Flames: Atmospheric Butane and Butanol Isomers, and Elevated-pressure Ethylene

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Soot and Pah Formation in Counterflow Non-premixed Flames: Atmospheric Butane and Butanol Isomers, and Elevated-pressure Ethylene by : Pradeep K Singh

Download or read book Soot and Pah Formation in Counterflow Non-premixed Flames: Atmospheric Butane and Butanol Isomers, and Elevated-pressure Ethylene written by Pradeep K Singh and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the complexity of the fluid dynamics and non-linear reactions in the combustion zone, a simplified approach to study this process is required. Given these complexities, it is practically very challenging to take measurements in very high temperature and pressure zones in practical combustion systems, and if by any means those measurements can be made, it is equally challenging to analyze those measurements. Hence, in order to more comprehensively understand these processes, the problem needs to be resolved into the smaller and controllable sub-category of experiments, by creating laminar flamelets. One approach used in creating these flamelets is by establishing simplified non-premixed flames in the counterflow configuration. Alongwith all the fundamental properties of combustion, it is important to study the health hazard and environmentally detrimental emissions, such as soot and polycyclic aromatic hydrocarbons (PAHs). Such combustion studies need to be carried out using the non-intrusive in-situ optical diagnostics measurement techniques, such as the Laser Induced Incandescence (LII), Planar Laser Induced Fluorescence (PLIF) and Light Extinction (LE). These measurements for renewable biofuels aid in better understanding of the soot formation process, as well as in developing the fuel specific knowledge to bring them into commercial use. Furthermore since the most practical combustion systems operate at elevated pressures, it is also important to understand the soot formation process under elevated pressure conditions. Considering these, in the current study, the soot and PAH formation processes for butane and butanol isomers (C4 fuels) at atmospheric pressure; and for ethylene at elevated pressure have been experimentally investigated and compared in a counterflow non-premixed flame configuration. Under the investigated conditions, butane isomers were observed to form more soot than butanol isomers, thereby showing the effect of the hydroxyl group. The effects of isomeric structural differences on sooting propensity were also observed within the butane and butanol isomers. In addition, while soot volume fraction was seen to increase with increasing fuel mole fraction, the ranking of sooting propensity for these C4 fuels remained unchanged. For the conditions studied, the sooting tendency ranking generally follows n-butane > iso-butane > tert-butanol > n-butanol > iso-butanol > sec-butanol. . The counterflow non-premixed flames were also simulated using the gas-phase chemical kinetic models, USC Mech II [1], Sarathy et al. [2] and Merchant et al. [3] available in the literature to compute the spatially-resolved profiles of soot precursors, including acetylene and propargyl. For these C4 fuels, the PAHs of various aromatic ring size groups (2, 3, 4, and larger aromatic rings) have been characterized and compared in non-premixed combustion configuration. In particular, the formation and growth of the PAHs of different aromatic ring sizes in these counterflow flames was examined by tracking the PAH-PLIF signals at various detection wavelengths. PAH-PLIF experiments were conducted, by blending each of the branched-chain isomers with the baseline straight-chain isomer, in order to study the synergistic effects. The fuel structure effects on the PAH formation and growth processes were also analyzed by comparing the PAH growth pathways for these C4 fuels. A chemical kinetic model, POLIMI mechanism [4-7], available in the literature that includes both the fuel oxidation and the PAH chemistry was also used to simulate and compare the PAH species up to A4 rings. Counterflow non-premixed sooting ethylene‒air flames with fuel mole fractions of 0.20‒0.40 in the pressure range of 1‒6 atm were investigated experimentally with the laser diagnostic techniques of LII, PLIF and LE. A better understating of the quantitative soot formation process has been developed for ethylene counterflow flames under elevated pressure conditions. The effect of pressure on the formation of PAHs with different aromatic ring sizes has also been determined qualitatively. With increase in pressure, the increase in soot volume fraction and PAH-PLIF signals were observed. A chemical kinetic model available in the literature, that includes both the fuel oxidation and the PAH chemistry, was also used to simulate and compare the PAH species up to A4 rings. At the incipient stage of the PAH formation, the simulated results exhibited similar behavior to the experimental observations. A chemical kinetic model, WF-PAH mechanism [8], available in the literature was also used to compute the PAHs up to four aromatic rings. This chemical kinetic model predicted enhancing PAHs formation with an increase in pressure, consistent with the experimental trend.

Soot Growth in Laminar Premixed Flames

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ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Soot Growth in Laminar Premixed Flames by : Fang Xu

Download or read book Soot Growth in Laminar Premixed Flames written by Fang Xu and published by . This book was released on 1999 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Effect of Oxygen Enrichment on Soot Formation and Thermal Radiation in Turbulent Non-Premixed Methane Flames

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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis The Effect of Oxygen Enrichment on Soot Formation and Thermal Radiation in Turbulent Non-Premixed Methane Flames by :

Download or read book The Effect of Oxygen Enrichment on Soot Formation and Thermal Radiation in Turbulent Non-Premixed Methane Flames written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soot Modeling of a Turbulent Non-premixed Methane/air Flame

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (654 download)

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Book Synopsis Soot Modeling of a Turbulent Non-premixed Methane/air Flame by :

Download or read book Soot Modeling of a Turbulent Non-premixed Methane/air Flame written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: