Turbine Burners: Turbulent Combustion of Liquid Fuels PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
The proposed theoretical/computational and experimental study addresses the vital two-way coupling between combustion processes and fluid dynamic phenomena associated with schemes for burning liquid fuels in high-speed, accelerating and turning transonic turbulent flows. A major motivation for this type of combustion configuration results from the demonstrated potential for immense improvements in the performance of gas turbine engines via combustion in the turbine passages. This program will address various fundamental issues concerning liquid-fuel combustion in an axially and centrifugally accelerating flow. The major combustion challenge involves ignition and flame-holding of the spray flame in the high-acceleration flow and associated optimization of the injection of the liquid fuel and some secondary air into a protected recirculation zone provided by a cavity.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
The proposed theoretical/computational and experimental study addresses the vital two-way coupling between combustion processes and fluid dynamic phenomena associated with schemes for burning liquid fuels in high-speed, accelerating and turning transonic turbulent flows. A major motivation for this type of combustion configuration results from the demonstrated potential for immense improvements in the performance of gas turbine engines via combustion in the turbine passages. This program will address various fundamental issues concerning liquid-fuel combustion in an axially and centrifugally accelerating flow. The major combustion challenge involves ignition and flame-holding of the spray flame in the high-acceleration flow and associated optimization of the injection of the liquid fuel and some secondary air into a protected recirculation zone provided by a cavity.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
This theoretical/computational and experimental study addressed the vital two-way coupling between combustion processes and fluid dynamic phenomena associated with schemes for burning liquid fuels in high-speed, accelerating, and turning transonic turbulent flows. A major motivation for this type of combustion configuration was the demonstrated potential for improvements in the performance of gas turbine engines via combustion in the turbine passages. This program addressed various fundamental issues concerning combustion in an axially and centrifugally accelerating flow. The major combustion challenge involved ignition and flame-holding of a flame in the high-acceleration flow and the associated optimization of the injection of the fuel and some secondary air into a protected recirculation zone provided by a cavity. The objectives were to advance our understanding of liquid-fuel combustion in accelerating flows and thereby to contribute to the development of turbine-burner technology.
Author: Norbert Peters
Publisher: Cambridge University Press
ISBN: 1139428063
Category : Science
Languages : en
Pages : 322
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Book Description
The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.
Author: Sandipan Chatterjee
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Turbulent non-premixed swirl-stabilized flames of gaseous and liquid fuels were investigated experimentally in an optically-accessible gas turbine model combustor. Propane/air and ethylene/air flames were operated at three global fuel-air equivalence ratios. Spray flames of liquid n-heptane fuel were stabilized at six global fuel-air equivalence ratios. The velocity, reaction zone structure and soot measurements were performed using stereoscopic particle image velocimetry, planar laser induced fluorescence of OH radicals and laser induced incandescence, respectively. In all the experimented test flow cases, the time-averaged velocity data show the presence of two large recirculation zones, separated by a zone of high velocity swirled inflow. The inner recirculation zone, which surrounds the combustor axis, shows high turbulence intensities. In gaseous fuel flames, the inner recirculation zone also contained most of the combustion-generated soot concentration of the flow field of gaseous fuel flames. The flow field regions exterior to the inner recirculation zone showed negligible soot values mainly due to the soot oxidation caused by the high intensity turbulence as well as strong OH intensity near the recirculation zone boundary. The time-averaged soot values showed strong sensitivity to changes in the air flow rates. The changes in the air flow rate mostly increased the soot intermittency, while the instantaneous soot concentrations stayed nearly constant. Intensified turbulence as well as shortening of flow time for soot chemistry are speculated to be the reasons for the high sensitivity of soot values to air flow rates. Further, in n-heptane/air flames, the velocity data showed a region of high velocity fuel droplets, positioned in-between two large recirculation zones. The boundary of the inner recirculation zones showed the heat release events, thereby leading to high OH counts. The OH fluorescence profiles showed the major role played by the recirculation zones in fuel droplet evaporation, forming the evaporated fuel-air reactant mixture, and subsequently, igniting the reactant mixture in the presence of hot combustion products and active radicals.
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: Andrea Donini
Publisher: Andrea Donini
ISBN: 9038636199
Category :
Languages : en
Pages : 173
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Book Description
In spite of the increasing presence of renewable energy sources, fossil fuels will remain the primary supply of the world's energy needs for the upcoming future. Modern gas-turbine based systems represent one of the most efficient large-scale power generation technology currently available. Alongside this, gas-turbine power plants operate with very low emissions, have flexible operational characteristics and are able to utilize a broad range of fuels. It is expected that gas-turbine based plants will play an important role as an effective means of converting combustion energy in the future as well, because of the vast potential energy savings. The numerical approach to the design of complex systems such as gas-turbines has gained a continuous growth of interest in the last few decades. This because simulations are foreseen to provide a tremendous increase in the combustor efficiency, fuel-flexibility and quality over the next future. In this dissertation, an advanced turbulent combustion technique is implemented and progressively developed for the simulation of all the features that are typically observed in stationary gas-turbine combustion, including hydrogen as a fuel. The developed turbulent combustion model retains most of the accuracy of a detailed simulation while drastically reducing its computational time. As a result of this work, the advancement of power generation plants can be accelerated, paving the way for future developments of alternative fuel usage in a cleaner and more efficient combustion.
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: Arthur H. Lefebvre
Publisher: CRC Press
ISBN: 1420086057
Category : Science
Languages : en
Pages : 560
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Book Description
Reflecting the developments in gas turbine combustion technology that have occurred in the last decade, Gas Turbine Combustion: Alternative Fuels and Emissions, Third Edition provides an up-to-date design manual and research reference on the design, manufacture, and operation of gas turbine combustors in applications ranging from aeronautical to po
Author: John Gordon Ryberg
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 188
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Book Description
Author: Hiroshi Tsuji
Publisher: CRC Press
ISBN: 1420041037
Category : Nature
Languages : en
Pages : 425
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Book Description
Maximize efficiency and minimize pollution: the breakthrough technology of high temperature air combustion (HiTAC) holds the potential to overcome the limitations of conventional combustion and allow engineers to finally meet this long-standing imperative. Research has shown that HiTAC technology can provide simultaneous reduction of CO2 and nitric
