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A Theoretical And Experimental Study Of Preferential Diffusion Stretch Interactions Of Laminar Premixed Flames
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Book Synopsis A Theoretical and Experimental Study of Preferential-diffusion/stretch Interactions of Laminar Premixed Flames by : Oh Chae Kwon
Download or read book A Theoretical and Experimental Study of Preferential-diffusion/stretch Interactions of Laminar Premixed Flames written by Oh Chae Kwon and published by . This book was released on 2000 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preferential-diffusion/stretch Interactions of Laminar Premixed Hydrogen/oxygen/nitrogen Flames by : Kyaw Than Aung
Download or read book Preferential-diffusion/stretch Interactions of Laminar Premixed Hydrogen/oxygen/nitrogen Flames written by Kyaw Than Aung and published by . This book was released on 1996 with total page 632 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 Studies on High Pressure and Unsteady Flame Phenomena by : Chung K. Law
Download or read book Studies on High Pressure and Unsteady Flame Phenomena written by Chung K. Law and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present program is to study the structure and response of steady and unsteady laminar premixed and nonpremixed flames in reduced and elevated pressure environments through (a) non-intrusive experimentation, (b) computational simulation using detailed flame and kinetic codes, and (c) asymptotic analysis with reduced kinetic mechanisms. During the reporting period progress has been made in the following projects: (1) a theoretical and experimental study of unsteady diffusion flames; (2) a computational and experimental study of hydrogen/air diffusion flames at sub- and super-atmospheric pressures; (3) an asymptotic analysis of the structure of premixed flames with volumetric heat loss; (4) asymptotic analyses of ignition in the supersonic hydrogen/air mixing layer with reduced mechanisms; (5) a new numerical algorithm for generating the ignition-extinction S-curves. A total of three reprints are appended.
Book Synopsis An Experimental and Numerical Study of the Inwardly-propagating Premixed Flame by : Alfonso F. Ibarreta
Download or read book An Experimental and Numerical Study of the Inwardly-propagating Premixed Flame written by Alfonso F. Ibarreta and published by . This book was released on 2002 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experiments in Laminar and Turbulent Premixed Counter-flow Flames at Variable Lewis Number by : Sean Salusbury
Download or read book Experiments in Laminar and Turbulent Premixed Counter-flow Flames at Variable Lewis Number written by Sean Salusbury and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis examines preferential diffusion effects in laminar and turbulent premixed combustion. Stretched, fuel-lean, laminar flames of methane, propane and hydrogen are studied experimentally in a counter-flow flame configuration to investigate the effect of Lewis number on stretched flames. Laminar flame results show that a maximum reference flame speed exists for mixtures with Le >= 1 at lower flame-stretch values than the extinction stretch rate. A continually-increasing reference flame speed is measured for Le “ 1 mixtures until extinction occurs when the flame is constrained by the stagnation point.Turbulent counter-flow flame experiments are then performed for these mixtures, using high-blockage turbulence-generating plates to produce turbulence intensities on the order of u'/sLo = 1 to 10. Measurements of average and instantaneous velocity within the turbulent flame are performed by time-resolved particle image velocimetry measurements. Average and instantaneous flame front position is also measured by Rayleigh spectroscopy.Measurements of average turbulent burning velocity demonstrate the ambiguity in definitions of the burning velocity and the difficulty of examining turbulent flame chemistry using averaged measurements. Instantaneous statistics are shown to be superior tools for studying turbulent combustion. The probability-density functions (PDF) of the local flamelet burning velocities for Le >= 1 mixtures show that the instantaneous flamelet burning velocities increase with increasing turbulence intensity and flame stretch. The PDF for the Le ~= 1 mixture has a sharply skewed shape at high turbulence intensity and has a sharp drop-off in probability at a velocity that corresponds with the experimentally-measured maximum reference flame speed from the laminar flame experiments. In contrast, in the Le “ 1 turbulent flames, the most-probable instantaneous flamelet burning velocities increase with increasing turbulence intensity and can significantly exceed the maximum reference flame speed measured in counter-flow laminar flames at extinction.These results are reinforced by instantaneous flame position measurements. Flame front location PDFs show the most probable flame location to be linked to velocity PDFs. Furthermore, hydrogen PDFs are recognizably skewed as u'/sLo increases, indicating a tendency for the Le “ 1 mixture to propagate farther into the unburned reactants. These results support the leading edge theory of premixed turbulent flame propagation for flames in which preferential diffusion effects are expected.In the study of turbulent flames, this work promotes the use of local, instantaneous statistics as a tool for describing experimental results and studying fuel chemistry." --
Book Synopsis Experimental Study of Premixed Flames in a Taylor-Couette Combustor by : Vahid Vaezi
Download or read book Experimental Study of Premixed Flames in a Taylor-Couette Combustor written by Vahid Vaezi and published by . This book was released on 2000 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Quantification of Transient Stretch Effects from Vortices Interacting with Premixed Flames by :
Download or read book Experimental Quantification of Transient Stretch Effects from Vortices Interacting with Premixed Flames written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding of complex premixed combustion reactions is paramount to the development of new concepts and devices used to increase the overall usefulness and capabilities of current technology. The evolution from laminar spherically propagating flames to turbulent chemistry is a logical and necessary process to study the complex interactions which occur within any modern practical combustion device. Methane-air flames were chosen to observe the mild affects of thermo-diffusive stability. Five primary propane equivalence ratios were utilized for investigation: 0.69, 0.87, 1.08, 1.32, and 1.49. The choice of equivalence ratio was strategically made so that the 0.69/1.49 and 0.87/1.32 mixtures have the same undiluted flame propagation rate, dr/dt. Therefore, in the undiluted case, there are two flame speeds represented by these mixtures. Three vortices were selected to be used in this investigation. The vortex rotational velocities were measured to be 77 cm/s, 266 cm/s and 398 cm/s for the “weakâ€, “medium†and “strong†vortices, respectively. Ignition of the flame occurred in two ways: (1) spark-ignition or (2) laser ignition using an Nd:YAG laser at its second harmonic in order to quantify the effect of electrode interference. Accompanying high-speed chemiluminescence imaging measurements, instantaneous pressure measurements were obtained to give a more detailed understanding of the effect of vortex strength on reactant consumption rate over an extended time scale and to explore the use of a simple measurement to describe turbulent mixing. Further local flame-vortex interface analysis was conducted using non-invasive laser diagnostics, such as particle image velocimetry and planer laser induced fluorescence of the OH radical. The dependence of heat release rate on temperature provides an estimation of the strain rate dependence of the reaction rate.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721129454 Total Pages :110 pages Book Rating :4.1/5 (294 download)
Book Synopsis Flow/Soot-Formation Interactions in Nonbuoyant Laminar Diffusion Flames by : National Aeronautics and Space Administration (NASA)
Download or read book Flow/Soot-Formation Interactions in Nonbuoyant Laminar Diffusion Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report of a research program considering interactions between flow and soot properties within laminar diffusion flames. Laminar diffusion flames were considered because they provide model flame systems that are far more tractable for theoretical and experimental studies than more practical turbulent diffusion flames. In particular, understanding the transport and chemical reaction processes of laminar flames is a necessary precursor to understanding these processes in practical turbulent flames and many aspects of laminar diffusion flames have direct relevance to turbulent diffusion flames through application of the widely recognized laminar flamelet concept of turbulent diffusion flames. The investigation was divided into three phases, considering the shapes of nonbuoyant round laminar jet diffusion flames in still air, the shapes of nonbuoyant round laminar jet diffusion flames in coflowing air, and the hydrodynamic suppression of soot formation in laminar diffusion flames. Dai, Z. and Lin, K.-C. and Sunderland, P. B. and Xu, F. and Faeth, G. M. Glenn Research Center NAG3-661
Book Synopsis On the Structure of Premixed and Diffusion Laminar Spherico-symmetrical Flames by : P. PEREZ. DELNOTARIO
Download or read book On the Structure of Premixed and Diffusion Laminar Spherico-symmetrical Flames written by P. PEREZ. DELNOTARIO and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Premixed and diffusion laminar spherico-symmetrical flames were studied by means of a theoretical model in which chemical kinetics is approximated by means of an over-all reaction rate. Nonadiabatic cases are fully considered and the influence of the main parameters of the process are thoroughly studied. Results of an experimental investigation on diffusion flames are also included. They have been obtained by burning in air hydrogen and butane injected through different sized porous ceramic spheres. A comparison between theoretical and experimental results is also included. (Author).
Book Synopsis An Experimental and Computational Study on the Propagation and Kinetic Structure of Laminar Premixed Flames by : Fokion Egolfopoulos
Download or read book An Experimental and Computational Study on the Propagation and Kinetic Structure of Laminar Premixed Flames written by Fokion Egolfopoulos and published by . This book was released on 1990 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Experimental Study of a Spherical Premixed Laminar Flame by : Suh Yong Lee
Download or read book The Experimental Study of a Spherical Premixed Laminar Flame written by Suh Yong Lee and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Investigation of Turbulent Premixed Flames by : Medhat T. F. Azzazy
Download or read book Theoretical and Experimental Investigation of Turbulent Premixed Flames written by Medhat T. F. Azzazy and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transport Phenomena In Combustion by : SH Chan
Download or read book Transport Phenomena In Combustion written by SH Chan and published by Taylor & Francis. This book was released on 2024-09-06 with total page 1862 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set presents the proceedings from the 8th International Symposium on Transport Phenomena in Combustion. There are more than 150 chapters that provide an extensive review of topics such as complete numerical simulation of combustion and heat transfer in furnaces and boilers, the interaction of combustion and heat transfer in porous media for low emission, high efficiency applications, industrial combustion technology, experimental and diagnostic methods and active combustion control, and fire research, internal combustion engine, Nox and soot emission.
Book Synopsis An Experimental and Numerical Study on the Structure and Extinction of Laminar Premixed Flames by : Chao Fu
Download or read book An Experimental and Numerical Study on the Structure and Extinction of Laminar Premixed Flames written by Chao Fu and published by . This book was released on 1994 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Stretch and Preferential Diffusion on Tip Opening of Laminar Premixed Bunsen Flames of Syngas/air Mixtures by :
Download or read book Effects of Stretch and Preferential Diffusion on Tip Opening of Laminar Premixed Bunsen Flames of Syngas/air Mixtures written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
