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Influences Of Flame Vortex Interactions On Formation Of Oxides Of Nitrogen In Curved Methane Air Diffusion Flamelets
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Author :John M. Sandia National Labs Card (Combustion Research Facility [email protected]) Publisher : ISBN 13 : Total Pages :13 pages Book Rating :4.:/5 (479 download)
Book Synopsis Influences of Flame-vortex Interactions on Formation of Oxides of Nitrogen in Curved Methane-air Diffusion Flamelets by : John M. Sandia National Labs Card (Combustion Research Facility [email protected])
Download or read book Influences of Flame-vortex Interactions on Formation of Oxides of Nitrogen in Curved Methane-air Diffusion Flamelets written by John M. Sandia National Labs Card (Combustion Research Facility [email protected]) and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influences of Flame-vortex Interactions on Formation of Oxides of Nitrogen in Curved Methane-air Diffusion Flamelets by :
Download or read book Influences of Flame-vortex Interactions on Formation of Oxides of Nitrogen in Curved Methane-air Diffusion Flamelets written by and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: To improve knowledge of production rates of nitrogen oxides in turbulent diffusion flames in reaction-sheet regimes, an analytical investigation is made of the structure of a parabolic flamelet. The mixture-fraction field, scalar dissipation rate and gas velocity relative to the flamelet in the vortex are related to flame curvature at the parabolic tip. Flame structure for major species and temperature is described by rate-ratio asymptotics based on two-step and three-step reduced chemical-kinetic mechanisms. Production rates by prompt, thermal and nitrous-oxide mechanisms are obtained from one-step reduced-chemistry approximations that employ steady states for all reaction intermediaries. For sufficiently large streamwise separation distances between isoscalar surfaces, it is found that equilibrium conditions are closely approached near the flame tip, and the thermal mechanism dominates there, but the prompt mechanism always dominates in the wings, away from the tip, where the highest rates of scalar dissipation occur. Increasing the tip curvature increases the Peclet number and the prompt contribution while decreasing the thermal contribution. At 1 atm and ambient temperatures of 300 K, the prompt mechanism always dominates the total production rate in the parabolic flamelet, and, perhaps surprisingly, the rate of the nitrous-oxide mechanism is faster than that of the thermal mechanism and varies with the tip curvature and with scalar dissipation in the same manner as that of the prompt mechanism, different from that of the thermal mechanism. Conclusion reached is that Zel'dovich NO is relatively insignificant in hydrocarbon-air mixtures in reaction-sheet regimes.
Book Synopsis Advances In Combustion Science by : Earl A. Thornton
Download or read book Advances In Combustion Science written by Earl A. Thornton and published by AIAA. This book was released on 1997 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pollutant Emissions from Nonpremixed Hydrocarbon Flames by : John Christopher Hewson
Download or read book Pollutant Emissions from Nonpremixed Hydrocarbon Flames written by John Christopher Hewson and published by . This book was released on 1997 with total page 458 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 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :W. A. Sirignano Publisher :AIAA (American Institute of Aeronautics & Astronautics) ISBN 13 : Total Pages :394 pages Book Rating :4.X/5 (4 download)
Book Synopsis Advances in Combustion Science by : W. A. Sirignano
Download or read book Advances in Combustion Science written by W. A. Sirignano and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1997 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authored by some of the most prestigious international researchers, this book contains 21 papers that address five general categories of combustion science: flame theory, heterogeneous combustion, unsteady and cellular combustion, turbulent combustion, and explosions and detonations. The book is dedicated to Yakov B. Zel'dovich, an eminent researcher known for his theoretical works on combustion and detonation, who served as the first chairman of the Scientific Council of the Academy of Sciences of the USSR. The first five papers give an important perspective of the developments in flame theory, and the critical role that Zel'dovich played in them. The second section examines the issues of heterogeneous combustion and the recent advances in the field. Material dealing with unsteady cellular combustion is addressed in the third section, and the fourth investigates turbulent combustion. The final section treats the subjects of detonations and explosions.
Book Synopsis Dynamics of Exothermicity by : Brian Bowen
Download or read book Dynamics of Exothermicity written by Brian Bowen and published by CRC Press. This book was released on 1996-09-15 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the dynamics of reactive systems and of explosions, the 15 papers discuss the treatment of turbulent mixing in reactive systems, acoustic interactions with combustion fields, liquid atomization, soot formation, practical applications of combustion in waste incineration and pulse jet ignition in internal combustion engines, detonations phenomena, and mixing effects in explosions. Includes six color plates. No index. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acid Precipitation written by and published by . This book was released on 1994 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in DNS and LES by : Doyle Knight
Download or read book Recent Advances in DNS and LES written by Doyle Knight and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers presents a broad range of topics in DNS and LES, from new developments in LES modeling to DNS and LES for supersonic and hypersonic boundary layers. The book provides an extensive view of the state of the art in the field.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994-11 with total page 1796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flame-vortex Interactions in Methane-air and Methanol-air Jet Diffusion Flames by : Hitesh Patadia
Download or read book Flame-vortex Interactions in Methane-air and Methanol-air Jet Diffusion Flames written by Hitesh Patadia and published by . This book was released on 1995 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Flame-vortex Interactions in Natural and Synthetic Gas Mixtures by : Justin D. Weiler
Download or read book Numerical Simulation of Flame-vortex Interactions in Natural and Synthetic Gas Mixtures written by Justin D. Weiler and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interactions between laminar premixed flames and counter-rotating vortex pairs in natural and synthetic gas mixtures have been computationally investigated through the use of Direct Numerical Simulations and parallel processing. Using a computational model for premixed combustion, laminar flames are simulated for single- and two-component fuel mixtures of methane, carbon monoxide, and hydrogen. These laminar flames are forced to interact with superimposed laminar vortex pairs, which mimic the effects of a pulsed, two-dimensional slot-injection. The premixed flames are parameterized by their unstretched laminar flame speed, heat release, and flame thickness. The simulated vortices are of a fixed size (relative to the flame thickness) and are parameterized, solely, by their rotational velocity (relative to the flame speed). Strain rate and surface curvature measurements are made along the stretched flame surfaces to study the effects of additive syngas species (CO and H2) on lean methane-air flames. For flames that share the same unstretched laminar flame speed, heat release, and flame thickness, it is observed that the effects of carbon monoxide on methane-air mixtures are essentially negigible while the effects of hydrogen are quite substantial. The dynamics of stretched CH4/Air and CH4/CO/Air flames are nearly identical to one another for interactions with both strong and weak vortices. However, the CH4/H2/Air flames demonstrate a remarkable tendency toward surface area growth. Over comparable interaction periods, the flame surface area produced during interactions with CH4/H2/Air flames was found to be more than double that of the pure CH4/Air flames. Despite several obvious differences, all of the interactions revealed the same basic phenomena, including vortex breakdown and flame pinch-off (i.e. pocket formation). In general, the strain rate and surface curvature magnitudes were found to be lower for the CH4/H2/Air flames, and comparable between CH4/Air and CH4/CO/Air flames. Rates of flame stretching are not explicitely determined, but are, instead, addressed through observation of their individual components. Two different models are used to determine local displacement speed values. A discrepancy between practical and theoretical definitions of the displacement speed is evident based on the instantaneous results for CH4/Air and CH4/H2/Air flames interacting with weak and strong vortices.
Book Synopsis High-pressure flame system for pollution studies with results for methane-air diffusion flames by : Irvin M. Miller
Download or read book High-pressure flame system for pollution studies with results for methane-air diffusion flames written by Irvin M. Miller and published by . This book was released on 1977 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
