Combustion of Single Droplets of Multicomponent Fuels PDF Download
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Author: Nasim-ul-Hassan Malik
Publisher:
ISBN:
Category :
Languages : en
Pages : 580
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Book Description
Author: Nasim-ul-Hassan Malik
Publisher:
ISBN:
Category :
Languages : en
Pages : 580
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Book Description
Author: Kannan Vittilapuram Subramanian
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The quasi-steady, spherically symmetric combustion of multicomponent isolated fuel droplets has been modeled using modified Shvab-Zeldovich variable mechanism. Newly developed modified Shvab-Zeldovich equations have been used to describe the gas phase reactions. Vapor-liquid equilibrium model has been applied to describe the phase change at the droplet surface. Constant gas phase specific heats are assumed. The liquid phase is assumed to be of uniform composition and temperature. Radiative heat transfer between the droplet and surroundings is neglected. The results of evaporation of gasoline with discrete composition of hydrocarbons have been presented. The evaporation rates seem to follow the pattern of volatility differentials. The evaporation rate constant was obtained as 0.344mm2/sec which compared well with the unsteady results of Reitz et al. The total evaporation time of the droplet at an ambience of 1000K was estimated to be around 0.63 seconds. Next, the results of evaporation of representative diesel fuels have been compared with previously reported experimental data. The previous experiments showed sufficient liquid phase diffusional resistance in the droplet. Numerical results are consistent with the qualitative behavior of the experiments. The quantitative deviation during the vaporization process can be attributed to the diffusion time inside the droplet which is unaccounted for in the model. Transient evaporation results have also been presented for the representative diesel droplets. The droplet temperature profile indicates that the droplet temperature does not reach an instantaneous steady state as in the case of single-component evaporation. To perform similar combustion calculations for multicomponent fuel droplets, no simple model existed prior to this work. Accordingly, a new simplified approximate mechanism for multicomponent combustion of fuel droplets has been developed and validated against several independent data sets. The new mechanism is simple enough to be used for computational studies of multicomponent droplets. The new modified Shvab-Zeldovich mechanism for multicomponent droplet combustion has been used to model the combustion characteristics of a binary alcohol-alkane droplet and validated against experimental data. Burn rate for the binary droplet of octanol-undecane was estimated to be 1.17mm2/sec in good concurrence with the experimental value of 0.952mm2/sec obtained by Law and Law. The model has then been used to evaluate the combustion characteristics of diesel fuels assuming only gas phase reactions. Flame sheet approximation has been invoked in the formulation of the model.
Author: Saptarshi Basu
Publisher: Springer
ISBN: 9811074496
Category : Technology & Engineering
Languages : en
Pages : 433
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Book Description
This book focuses on droplets and sprays relevant to combustion and propulsion applications. The book includes fundamental studies on the heating, evaporation and combustion of individual droplets and basic mechanisms of spray formation. The contents also extend to the latest analytical, numerical and experimental techniques for investigating the behavior of sprays in devices like combustion engines and gas turbines. In addition, the book explores several emerging areas like interactions between sprays and flames and the dynamic characteristics of spray combustion systems on the fundamental side, as well as the development of novel fuel injectors for specific devices on the application side. Given its breadth of coverage, the book will benefit researchers and professionals alike.
Author: Forman A. Williams
Publisher: CRC Press
ISBN: 0429973683
Category : Science
Languages : en
Pages : 549
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Book Description
Combustion Theory delves deeper into the science of combustion than most other texts and gives insight into combustions from a molecular and a continuum point of view. The book presents derivations of the basic equations of combustion theory and contains appendices on the background of subjects of thermodynamics, chemical kinetics, fluid dynamics, and transport processes. Diffusion flames, reactions in flows with negligible transport and the theory of pre-mixed flames are treated, as are detonation phenomena, the combustion of solid propellents, and ignition, extinction, and flamibility pehnomena.
Author: Bernard J. Wood
Publisher:
ISBN:
Category : Liquid propellants
Languages : en
Pages : 42
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Book Description
Author: B. J. Wood
Publisher:
ISBN:
Category : Liquid propellants
Languages : en
Pages : 36
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Book Description
Author: Alan Williams
Publisher: Butterworth-Heinemann
ISBN: 1483101584
Category : Technology & Engineering
Languages : en
Pages : 300
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Book Description
Combustion of Liquid Fuel Sprays outlines the fundamentals of the combustion of sprays in a unified way which may be applied to any technological application. The book begins with a discussion of the general nature of spray combustion, the sources of liquid fuels used in spray combustion, biomass sources of liquid fuels, and the nature and properties of fuel oils. Subsequent chapters focus on the properties of sprays, the atomization of liquid fuels, and the theoretical modeling of the behavior of a spray flame in a combustion chamber. The nature and control of pollutants from spray combustion, the formation of deposits in oil-fired systems, and the combustion of sprays in furnaces and engines are elucidated as well. The text is intended for students undertaking courses or research in fuel, combustion, and energy studies.
Author: MICHAL A. SAAD
Publisher:
ISBN:
Category :
Languages : en
Pages : 135
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Book Description
Author: Narugopal Ghata
Publisher:
ISBN: 9781321608601
Category :
Languages : en
Pages :
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Book Description
A detailed computational study of evaporation and combustion phenomena of unsupported and fiber-supported single and multi-component droplets is presented. The current study consists of a total of five parts: (a) study the effects of support fibers on the vaporization of single component n-heptane droplets, (b) study the effects of the Marangoni stress in single component n-heptane droplet combustion, (c) study the effects of support fibers in single component n-heptane droplet combustion, (d) study soot shell formation for single component n-heptane droplet, and (e) study multi-component n-heptane/n-hexadecane droplet evaporation and combustion. The volume-of-fluid (VOF) method is employed in the studies to capture the liquid-gas interface for transient two-phase multidimensional flows. The calculations also include variable thermo-physical properties of the liquid and gas phases as well as Marangoni stresses. In the first part of the study, a detailed numerical investigation of the effects of support fibers on the vaporization of a fiber-supported n-heptane droplet in reduced gravity is presented. This part of the study also investigated the effects of the thickness of fiber, ambient pressure, and ambient temperature on droplet evaporation. The computational results were validated with experimental results. In the second part of the droplet combustion study, a detailed numerical investigation of the Marangoni effects for fiber supported n-heptane droplet combustion in reduced gravity is presented. A 21-step n-heptane reaction mechanism proposed by Machrafi et al. (2009) is incorporated to model the combustion with both low and high temperature chemistry. Predicted burning rates and flame diameters have been validated with data from drop tower experiments. The present computational results agree well with the experimental results. The primary focus in the third part of the study is on the effects of support fibers on the droplet burning rates and flame structure. A 21-step n-heptane reaction mechanism consisting of 20 species proposed by Zhang et al. (2013) is employed to model the combustion chemistry. Computed burning rates and flame stand-off ratios are compared with the experimental results of Jackson and Avedisian (1993). Predicted flame structures are also validated with the experimental results of Mikami et al. (1994). The present computational results agree well with the experimental results. The results indicate that the support fibers can have significant impact on droplet burning rates and flame structures. In the fourth part of the study, a detailed numerical investigation of unsupported and fiber supported n-heptane droplet combustion in reduced gravity is done to explore some important information i.e., the location of pyrolysis and soot shell using a complex multidimensional computational fluid dynamic (CFD) analysis with a detailed reaction mechanism. A 25-step n-heptane mechanism consisting of 21 species is incorporated to model the combustion. The reaction mechanism is validated for the ignition delay time. Computed burning rates and flame stand-off ratios for both unsupported and fiber-supported droplets have been validated with prior computational and experimental studies. The computed soot shell stand-off ratios are validated by comparisons with experimental and computational results. The present computational results agree well with the experimental results.In the fifth and final part, a numerical study of vaporization and combustion of unsupported and fiber-supported multi-component n-heptane/n-hexadecane droplet is presented.
Author: W. A. Sirignano
Publisher: Cambridge University Press
ISBN: 0521884896
Category : Science
Languages : en
Pages : 481
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Book Description
This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
