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Numerical And Experimental Study Of Mixing Properties Of Gaseous Fuels Jets Including Hydrogen And Methane Into The Non Swirl Main Flow In A Premixer Configuration
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Book Synopsis Numerical and Experimental Study of Mixing Properties of Gaseous Fuels Jets Including Hydrogen and Methane Into the Non-swirl Main Flow in a Premixer Configuration by : Amin Akbari
Download or read book Numerical and Experimental Study of Mixing Properties of Gaseous Fuels Jets Including Hydrogen and Methane Into the Non-swirl Main Flow in a Premixer Configuration written by Amin Akbari and published by . This book was released on 2010 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mixing of fuel and air has a significant impact on overall operation efficiency and emissions performance of combustion systems, especially in lean combustion applications. As a result, developing an understanding of the processes associated with the fuel/air mixing is important. In parallel with the evolution of lean combustion, a new generation of fuels is emerging as an alternative to conventional fuels. Thus, it is desirable to study the mixing properties of different fuels from conventional resources, such as methane, as well as from renewable resources, such as hydrogen. One tool that is available to study mixing in complex (e.g., turbulent and elliptic) flows is computational fluid dynamics (CFD). In the present work, mixing of hydrogen and methane into air, for example, is simulated using various CFD approaches. Fuel is injected either co-flowing to the air flow ("axial injection") or perpendicular to the air flow ("radial injection"). The quality of the simulations is evaluated by comparing the numerical results with experimental measurements. Qualitative and quantitative comparisons are used to evaluate the relative accuracy of different CFD approaches to simulate the mixing characteristics. Reynolds Averaged Navier-Stokes (RANS) turbulent models are utilized to model all the cases as steady turbulent models. Moreover, unsteady turbulent models, such as Unsteady RANS, and Large Eddy Simulation (LES) are used to provide information about unsteady features in selected cases. The sensitivity of numerical predictions to different RANS turbulence models as well as to different turbulent Schmidt numbers are explored. The results indicate more sensitivity to turbulence models for radial injection configurations. However, for the axial configuration, more sensitivity to Sct is observed. In general, the RSM turbulence model with Sct=0.7 provides the most promising predictions for various combination of different fuels and injection types.
Book Synopsis Study of Ing Properties of Gaseous Fuels Jets in a Premixer by : Amin Akbari
Download or read book Study of Ing Properties of Gaseous Fuels Jets in a Premixer written by Amin Akbari and published by LAP Lambert Academic Publishing. This book was released on 2012-05 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present work, mixing of hydrogen and methane into air is simulated using various CFD approaches. Fuel is injected either co-flowing to the air flow ( axial injection ) or perpendicular to the air flow ( radial injection ). The quality of the simulations is evaluated by comparing the numerical results with experimental measurements. Qualitative and quantitative comparisons are used to evaluate the relative accuracy of different CFD approaches to simulate the mixing characteristics. Reynolds Averaged Navier Stokes (RANS) turbulence models are utilized to model all the cases as steady turbulence models. Moreover, unsteady turbulence models, such as Unsteady RANS, and Large Eddy Simulation (LES) are used to provide information about unsteady features in selected cases. The sensitivities of numerical predictions to different RANS turbulence models as well as to different turbulent Schmidt numbers are explored.
Book Synopsis Experimental Studies of Hydrogen-air Mixing Processes by : Scott P. Hill
Download or read book Experimental Studies of Hydrogen-air Mixing Processes written by Scott P. Hill and published by . This book was released on 2011 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing concerns over pollutant emissions and fuel scarcity have led to increased interest into new fuel sources in general and hydrogen in particular. Hydrogen has the potential to be sourced as a renewable fuel with no net carbon emissions and low pollutant emissions. However, to achieve the low pollutant emissions, a thorough understanding of the fuel and its mixing properties are required. To aid in this understanding, this study focuses on the mixing processes of hydrogen and air. To accomplish this understanding, measurements of fuel concentration and velocity were obtained at a number of planes downstream of the fuel injection plane. Injection type and flow conditions were varied to evaluate their impact on the mixing, and measurements were obtained for both hydrogen and methane. The primary findings of the study suggest that for low pressure drop fuel injection the jet-momentum flux ratio is the controlling value for the injection mixing behavior, and that little to no discernable difference was found in the spatial distribution of hydrogen in comparison to methane. Additionally, it was found that the addition of flow swirl improved mixing near the injection plane, but that it created a reduced level of radial mixing further downstream as it worked to maintain a core of high fuel concentration. Overall, the results suggest that many of the standard design tools employed for more standard fuels such as methane still hold true for hydrogen, with the difference between the two being the larger volume of hydrogen due to its lower density.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1993 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AN EXPERIMENTAL STUDY OF COAXIAL TURBULENT MIXING OF LIQUID AND GASEOUS FUEL WITH AIR by : C.W. LAPOINTE
Download or read book AN EXPERIMENTAL STUDY OF COAXIAL TURBULENT MIXING OF LIQUID AND GASEOUS FUEL WITH AIR written by C.W. LAPOINTE and published by . This book was released on with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MILD Combustion: Modelling Challenges, Experimental Configurations and Diagnostic Tools by : Alessandro Parente
Download or read book MILD Combustion: Modelling Challenges, Experimental Configurations and Diagnostic Tools written by Alessandro Parente and published by Frontiers Media SA. This book was released on 2021-11-26 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Premixed Flames by : Nedunchezhian Swaminathan
Download or read book Turbulent Premixed Flames written by Nedunchezhian Swaminathan and published by Cambridge University Press. This book was released on 2011-04-25 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: A work on turbulent premixed combustion is important because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the potential to offer ultra-low emission levels, but they are notoriously susceptible to combustion oscillations. Thus, sophisticated control measures are inevitably required. The editors' intent is to set out the modeling aspects in the field of turbulent premixed combustion. Good progress has been made on this topic, and this cohesive volume contains contributions from international experts on various subtopics of the lean premixed flame problem.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flashback Mechanisms in Lean Premixed Gas Turbine Combustion by : Ali Cemal Benim
Download or read book Flashback Mechanisms in Lean Premixed Gas Turbine Combustion written by Ali Cemal Benim and published by Academic Press. This book was released on 2014-12-01 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blending fuels with hydrogen offers the potential to reduce NOx and CO2 emissions in gas turbines, but doing so introduces potential new problems such as flashback. Flashback can lead to thermal overload and destruction of hardware in the turbine engine, with potentially expensive consequences. The little research on flashback that is available is fragmented. Flashback Mechanisms in Lean Premixed Gas Turbine Combustion by Ali Cemal Benim will address not only the overall issue of the flashback phenomenon, but also the issue of fragmented and incomplete research. Presents a coherent review of flame flashback (a classic problem in premixed combustion) and its connection with the growing trend of popularity of more-efficient hydrogen-blend fuels Begins with a brief review of industrial gas turbine combustion technology Covers current environmental and economic motivations for replacing natural gas with hydrogen-blend fuels
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1971 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Performance of Various Mixtures of Hydrogen and Methane by : Clyde W. MCLaughlin
Download or read book An Investigation of the Performance of Various Mixtures of Hydrogen and Methane written by Clyde W. MCLaughlin and published by . This book was released on 1966 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of this study was to evaluate the performance of various mixtures of hydrogen and methane as a fuel with oxygen as an oxidizer. A computer program was used to provide the theoretical results at a chamber pressure of 60 psia and mixture ratios from 1.5 to 5.0. The fraction of methane in the fuel was varied from 0 to 1.0. Experimental results were obtained by using a small reverse flow rocket engine and three separate propellant feed systems with a mixing chamber to combine the hydrogen and methane prior to the gases entering the fuel manifold of the rocket. A non-linear degradation of characteristic exhaust velocity was found as the fraction of methane in the fuel was increased. The degradation with all methane as the fuel was 77% of the pure hydrogen-oxygen performance. Experimentally, the combustion efficiency was found to decrease with an increasing percentage of methane in the fuel. (Author).
Book Synopsis Monthly Catalog of United States Government Publications, Cumulative Index by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications, Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature Air Combustion by : Hiroshi Tsuji
Download or read book High Temperature Air Combustion written by Hiroshi Tsuji and published by CRC Press. This book was released on 2002-12-03 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis An Experimental Investigation of Ducted, Reactive, Turbulent Jet Mixing with Recirculation by : D. E. Chriss
Download or read book An Experimental Investigation of Ducted, Reactive, Turbulent Jet Mixing with Recirculation written by D. E. Chriss and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of ducted, two stream, subsonic, reactive, turbulent jet mixing with recirculation was conducted. A primary jet of air at a mass flow rate of 0.075 lb/sec and velocity of 700 ft/sec was surrounded by an outer, low velocity, hydrogen stream. Data were obtained with hydrogen-air ratios of 0.143 and 0.107. The duct-to-inner nozzle diameter ratio was ten. Radial distributions of hydrogen mass fraction, mean axial velocity, turbulence intensity, and total pressure as well as axial distributions of wall hydrogen mass fraction and wall static pressure are presented for axial stations from one-half to five duct diameters from the nozzle exit plane. Comparison of the experimental data with calculations assuming frozen or equilibrium chemistry indicate that he measured velocity, pressure, and composition data are, in general, self-consistent. The maximum turbulent intensities which occurred in the center of the mixing layer and within the recirculation eddy were very high having values of 20 percent of the jet exit velocity. The velocity and composition field indicate that, while and mixing in the reactive flow field is slower than for the nonreactive case, the reaction had little effect on the size and location of the recirculation zone within the mixing duct.
Book Synopsis Lectures in Mathematical Models of Turbulence by : Brian Edward Launder
Download or read book Lectures in Mathematical Models of Turbulence written by Brian Edward Launder and published by . This book was released on 1979 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Turbine Emissions by : Timothy C. Lieuwen
Download or read book Gas Turbine Emissions written by Timothy C. Lieuwen and published by Cambridge University Press. This book was released on 2013-07-08 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of clean, sustainable energy systems is a preeminent issue in our time. Gas turbines will continue to be important combustion-based energy conversion devices for many decades to come, used for aircraft propulsion, ground-based power generation, and mechanical-drive applications. This book compiles the key scientific and technological knowledge associated with gas turbine emissions into a single authoritative source.
