The Effect of Turbulence on Vaporization and Mixing in Fuel Sprays PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 9
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Book Description
An experimental study of droplet-turbulence interactions under simulated fuel spray conditions has been conducted. The behavior of individual droplets transversely injected into laminar and turbulent flows has been characterized by measuring droplet position, shape and size as a function of time. From these measurements new information has been obtained on the effects of vaporization and unsteady curvilinear motion on droplet drag and lift in laminar flows. These measurements have also provided new data which characterize the effects of turbulence on droplet drag, dispersion and secondary breakup. jg.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
An experimental study of droplet-turbulence interactions under simulated fuel spray conditions has been conducted. The behavior of individual droplets transversely injected into laminar and turbulent flows has been characterized by measuring droplet position, shape and size as a function of time. From these measurements new information has been obtained on the effects of vaporization and unsteady curvilinear motion on droplet drag and lift in laminar flows. These measurements have also provided new data which characterize the effects of turbulence on droplet drag, dispersion and secondary breakup. jg.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
Results are presented from an experimental study of droplet phenomena in diesel engine and gas turbine combustor simulated flows. Three specific phenomena have been studied: (1) the use of exciplex fluorescence to characterize the vaporization of liquid droplets in unsteady flows, (2) the enhanced secondary breakup of liquid droplets in flows with intense turbulence, and (3) the behavior of liquid jets injected into supercritical environments.
Author: Fenando F. Grinstein
Publisher: Cambridge University Press
ISBN: 1107137047
Category : Science
Languages : en
Pages : 481
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Book Description
Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Author: Bart Merci
Publisher: Springer Science & Business Media
ISBN: 9400714092
Category : Technology & Engineering
Languages : en
Pages : 180
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Book Description
This book reflects the outcome of the 1st International Workshop on Turbulent Spray Combustion held in 2009 in Corsica (France). The focus is on reporting the progress of experimental and numerical techniques in two-phase flows, with emphasis on spray combustion. The motivation for studies in this area is that knowledge of the dominant phenomena and their interactions in such flow systems is essential for the development of predictive models and their use in combustor and gas turbine design. This necessitates the development of accurate experimental methods and numerical modelling techniques. The workshop aimed at providing an opportunity for experts and young researchers to present the state-of-the-art, discuss new developments or techniques and exchange ideas in the areas of experimentations, modelling and simulation of reactive multiphase flows. The first two papers reflect the contents of the invited lectures, given by experts in the field of turbulent spray combustion. The first concerns computational issues, while the second deals with experiments. These lectures initiated very interesting and interactive discussions among the researchers, further pursued in contributed poster presentations. Contributions 3 and 4 focus on some aspects of the impact of the interaction between fuel evaporation and combustion on spray combustion in the context of gas turbines, while the final article deals with the interaction between evaporation and turbulence.
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781731087157
Category :
Languages : en
Pages : 82
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Book Description
A two dimensional, implicit finite difference method of the control volume variety, a two equation model of turbulence, and a discrete droplet model were used to study the flow field, turbulence levels, fuel penetration, vaporization, and mixing in diesel engine environments. The model was also used to study the effects of engine speed, injection angle, spray cone angle, droplet distribution, and intake swirl angle on the flow field, spray penetration and vaporization, and turbulence in motored two-stroke diesel engines. It is shown that there are optimum conditions for injection, which depend on droplet distribution, swirl, spray cone angle, and injection angle. The optimum conditions result in good spray penetration and vaporization and in good fuel mixing. The calculation presented clearly indicates that internal combustion engine models can be used to assess, at least qualitatively, the effects of injection characteristics and engine operating conditions on the flow field and on the spray penetration and vaporization in diesel engines. Nguyen, Hung Lee and Carpenter, Mark H. and Ramos, Juan I. and Schock, Harold J. and Stegeman, James D. Glenn Research Center; Langley Research Center...
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1556
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Book Description
Author:
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ISBN:
Category : Military research
Languages : en
Pages : 274
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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Book Description
Author: Bart Merci
Publisher: Springer Science & Business Media
ISBN: 3319046780
Category : Technology & Engineering
Languages : en
Pages : 167
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Book Description
This book reflects the results of the 2nd and 3rd International Workshops on Turbulent Spray Combustion. The focus is on progress in experiments and numerical simulations for two-phase flows, with emphasis on spray combustion. Knowledge of the dominant phenomena and their interactions allows development of predictive models and their use in combustor and gas turbine design. Experts and young researchers present the state-of-the-art results, report on the latest developments and exchange ideas in the areas of experiments, modelling and simulation of reactive multiphase flows. The first chapter reflects on flame structure, auto-ignition and atomization with reference to well-characterized burners, to be implemented by modellers with relative ease. The second chapter presents an overview of first simulation results on target test cases, developed at the occasion of the 1st International Workshop on Turbulent Spray Combustion. In the third chapter, evaporation rate modelling aspects are covered, while the fourth chapter deals with evaporation effects in the context of flamelet models. In chapter five, LES simulation results are discussed for variable fuel and mass loading. The final chapter discusses PDF modelling of turbulent spray combustion. In short, the contributions in this book are highly valuable for the research community in this field, providing in-depth insight into some of the many aspects of dilute turbulent spray combustion.
Author: RD. Reitz
Publisher:
ISBN:
Category : Drops
Languages : en
Pages : 13
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Book Description
Local drop-size, velocity, and liquid flux profiles were measured within conical steady sprays using a phase/Doppler velocimeter. The coflowing gas mean velocity, gridinduced turbulence intensity and length scale, and its temperature and pressure were each varied using a wind tunnel facility (gas velocity from 3 to 22.2 m/s, turbulence intensity from 2.7 to 8.6%, length scale from 8.4 to 17.8 mm, gas temperature from 300 to 750K, gas pressure from 101 to 610 kPa, and a differential injection pressure of 689 kPa). The results show that the turbulence in the gas influences the drop-size and velocity distributions. Drop mean and fluctuating velocity components were found to be close to the gas mean and turbulence velocities in regions where the drop-size-velocity correlation coefficient was low. The drop-size-velocity correlation decreased with increasing gas density and gas velocity. Drop-size distributions broadened, and the total amount of liquid vaporized increased when the turbulence intensity and scale were increased. At a given gas temperature, the amount of vaporization increased when the gas density was increased and the overall drop size (a flux-weighted Sauter mean over the spray cross-section) also decreased. However, local drop sizes were larger in vaporizing sprays than in nonvaporizing sprays at the same gas density. This interesting result could be due to the fact that the gas viscosity increases with increasing gas temperature and this increases the drop-drag coefficient, leading to reduced radial penetration of the spray. An additional factor is that, although vaporization reduces the size of all drops, smaller drops vaporize faster and drop-size averages are weighted towards larger drops.
