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Author : S. R. Gollahalli
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Effects of Pilot Flame Stabilization on Gas Jet Flames in a Cross-flow written by S. R. Gollahalli and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Karl Bastress
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (178 download)
Download or read book The Effects of Pilot Flame Ignition on Flame Stabilization in an Open Flame Burner and in a Ram-jet Type Burner written by E. Karl Bastress and published by . This book was released on 1954 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Leading-Edge Flame Behavior on Flame Stabilization and Blowout written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work was to identify the mechanisms that effect stabilization of hydrocarbon jet flames. Methane, nitrogen, and co-flowing air were regulated and directed through a burner that created fully-developed fuel flow with concurrent air. The behavior of the reaction zone at the leading-edge was analyzed from digital images obtained from a camera optimally positioned to capture the movements of the entire flame front. Low Reynolds number flows allowed for the investigation of hysteretic behavior. The hysteresis regime refers to the situation where the jet flame has dual positions favorable to flame stabilization: attached and lifted. Results indicate that flame height in hysteresis is significantly impacted by high velocities of co-flow and that past a critical value a local minimum will be created. Fully turbulent lifted flames were also studied to determine the fluctuations in the height of lifted methane flames in the presence of air co-flow. The partially-premixed flame front of the lifted flame fluctuates in the axial direction, with the fluctuations becoming greater in flames stabilized further downstream. These fluctuations are also observed in flames where blowout is imminent. The height and rate of these fluctuations are studied with respect to average height, flow velocities, and Reynolds number. Additionally, the mechanisms that cause jet-flame blowout, particularly in the presence of air co-flow, are not completely understood. Two types of experiments are described, and the data report that a predictor of blowout is the prior disappearance of the axially-oriented flame branch which is consistently witnessed despite a turbulent flameÃØâ'Ơâ"Øs inherent variable behavior. The conclusions are supported by experiments with nitrogen-diluted flames. A blowout parameter is also calculated for methane flames in co-flow and diluted methane flames that can be used to predict at what flow velocities blowout will occur. This work analyzes flames near the bu.
Author : Jr., Charles E. Baukal
Publisher : CRC Press
ISBN 13 : 1420085298
Total Pages : 777 pages
Book Rating : 4.4/5 (2 download)
Download or read book Industrial Combustion Testing written by Jr., Charles E. Baukal and published by CRC Press. This book was released on 2010-07-29 with total page 777 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until now, anyone conducting industrial combustion tests had to either rely on old methods, go scurrying through the literature to find proven applicable methodologies, or hire top-shelf consultants such as those that work for cutting-edge companies like John Zink. Manufacturers can no longer take industrial combustion for granted. Air and noise po
Author : Ho-Nam Bang
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (361 download)
Download or read book An Experimental Investigation of Jet Diffusion Flames written by Ho-Nam Bang and published by . This book was released on 1996 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 2 pages
Book Rating : 4.:/5 (965 download)
Download or read book Effect of Differential Diffusion on Flame Stabilization in a Syngas Jet in Turbulent Cross-flow written by and published by . This book was released on 2015 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas H. Cochran
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effects of Gravity on Laminar Gas Jet Diffusion Flames written by Thomas H. Cochran and published by . This book was released on 1970 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to study the burning of laminar gas jet diffusion flames in a zero-gravity environment. The tests were conducted in the Lewis Research Center 2.2-Second Zero-Gravity Facility. The photographic results indicated that a sudden decrease in gravity level from 1 to 0 effected an immediate reduction in the length of the flame. Continued time in zero gravity resulted in the flame expanding away from the burner until extinguishment appeared to occur. Nondimensionalization of the governing flow equation yielded the parameters used to correlate the buoyancy effects.
Author : Thomas Joseph O'Connor
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (338 download)
Download or read book Flame Stabilization in High Speed Flow by Pilot Flames written by Thomas Joseph O'Connor and published by . This book was released on 1961 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bernard Lewis
Publisher : Academic Press
ISBN 13 : 1483258394
Total Pages : 754 pages
Book Rating : 4.4/5 (832 download)
Download or read book Combustion, Flames and Explosions of Gases written by Bernard Lewis and published by Academic Press. This book was released on 2013-10-22 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion, Flames, and Explosions of Gases, Second Edition focuses on the processes, methodologies, and reactions involved in combustion phenomena. The publication first offers information on theoretical foundations, reaction between hydrogen and oxygen, and reaction between carbon monoxide and oxygen. Discussions focus on the fundamentals of reaction kinetics, elementary and complex reactions in gases, thermal reaction, and combined hydrogen-carbon monoxide-oxygen reaction. The text then elaborates on the reaction between hydrocarbons and oxygen and combustion waves in laminar flow. The manuscript tackles combustion waves in turbulent flow and air entrainment and burning of jets of fuel gases. Topics include effect of turbulence spectrum and turbulent wrinkling on combustion wave propagation; ignition of high-velocity streams by hot solid bodies; burners with primary air entrainment; and description of jet flames. The book then takes a look at detonation waves in gases; emission spectra, ionization, and electric-field effects in flames; and methods of flame photography and pressure recording. The publication is a valuable reference for readers interested in combustion phenomena.
Author : Darius Pardiwalla
Publisher :
ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.:/5 (464 download)
Download or read book Elliptic Gas Jet Flames in Cross-flow written by Darius Pardiwalla and published by . This book was released on 1996 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jason Allen Wagner
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (962 download)
Download or read book Experimental Studies on Flow Field and Flame Stabilization of a Premixed Reacting Jet in Vitiated Crossflow written by Jason Allen Wagner and published by . This book was released on 2016 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jihang Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book An Experimental Study of the Effect of a Pilot Flame on Combustion Instabilities written by Jihang Li and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lean-premixed gas turbines, due to their superior emission performance, have been widely used in the industry. However, lean-premixed combustion is susceptible to combustion instability, which has become a major concern in the design and operation of lean-premixed gas turbines. Passive secondary flames, also known as pilot flames, are commonly used for control of combustion instability. However, the underlying mechanism whereby a pilot flame suppresses combustion instability is not fully understood. This limits the improvement of pilot systems.This dissertation presents an experimental study on the effect of a pilot flame on combustion instabilities in an atmospheric, laboratory-scale, single-nozzle, swirl-stabilized, lean-premixed combustor. The pilot flame is a central jet flame injected from the centerbody, which can operate in either the technically-premixed or the fully-premixed modes, depending on the types of pilot injectors. Piezoelectric sensors are utilized to measure the pressure fluctuation and the velocity fluctuation. High speed CH* chemiluminescence techniques are used to measure the dynamics of the flame. The instability characteristics of the technically-premixed unpiloted flame are measured at varying combustor length. Four distinct instability modes with different frequencies are observed. A one-dimensional simulation is conducted to calculate the natural frequencies and mode shapes of the instabilities. The effect of varying the percent pilot of a technically-premixed pilot flame on the technically-premixed combustion instabilities in different modes is studied. Instability maps to the percent pilot and the overall equivalence ratio are presented and discussed. The instability boundaries in each instability map, which separates the unstable regions from the stable regions, are discussed in detail by analyzing the high-speed images and Rayleigh index images. The results show that the pilot flame affects the main flame dynamics primarily through enhancing flame attachment and flame oscillation in the inner shear layer. The effect of independently varying the pilot air, pilot fuel and pilot mixture flow rates on the technically-premixed combustion instabilities are studied by utilizing a modified pilot injector. The results show that the effect of the pilot flame on the combustion instability is primarily determined by the equivalence ratio, but not the mixture flow rate of the pilot flame. The results support the statement that pilot flames influence the main flame dynamics by heat recirculation and demonstrate that the effect of the pilot flame is determined by its ability to change the time-averaged recirculation zone temperature. The structures of the pilot flame are presented and discussed.Fully-premixed flame transfer functions under the influence of a premixed pilot flame are investigated. The flame transfer functions show distinct behaviors at low frequencies and high frequencies. At low frequencies, the pilot flame has a weak effect on the FTF gain and phase, while at high frequencies, increasing the percent pilot reduces the FTF gain and shifts the FTF phase. High-speed chemiluminescence images show the pilot flame enhances the fluctuation near the base of the flame, which enhances the destructive interference within the inner shear layer, reduces the FTF gain and shifts the FTF phase at high frequencies. By separating the flame transfer function into different regions, it was found that a pilot flame only influences the inner shear layer, but not the near-wall region and the outer recirculation zone.
Author :
Publisher :
ISBN 13 :
Total Pages : 391 pages
Book Rating : 4.:/5 (816 download)
Download or read book P. Hofstede, over de bevordering van christendom en beschaving in de koloniën van den staat written by and published by . This book was released on with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ann R. Karagozian
Publisher : Springer
ISBN 13 : 3709127920
Total Pages : 304 pages
Book Rating : 4.7/5 (91 download)
Download or read book Manipulation and Control of Jets in Crossflow written by Ann R. Karagozian and published by Springer. This book was released on 2014-05-04 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental Non-Reactive Jets in Crossflow and Other Jet Systems; Background on Modeling, Dynamical Systems, and Control; Reactive Jets in Crossflow and Multiphase Jets; Controlled Jets in Crossflow and Control via Jet Systems;
Author : Isaac G. Boxx
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.:/5 (612 download)
Download or read book The effects of buoyancy on turbulent nonpremixed jet flames in crossflow written by Isaac G. Boxx and published by . This book was released on 2005 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Forman A. Williams
Publisher : CRC Press
ISBN 13 : 0429973683
Total Pages : 549 pages
Book Rating : 4.4/5 (299 download)
Download or read book Combustion Theory written by Forman A. Williams and published by CRC Press. This book was released on 2018-03-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Theory delves deeper into the science of combustion than most other texts and gives insight into combustions from a molecular and a continuum point of view. The book presents derivations of the basic equations of combustion theory and contains appendices on the background of subjects of thermodynamics, chemical kinetics, fluid dynamics, and transport processes. Diffusion flames, reactions in flows with negligible transport and the theory of pre-mixed flames are treated, as are detonation phenomena, the combustion of solid propellents, and ignition, extinction, and flamibility pehnomena.
Author : Michelle Otero
Publisher :
ISBN 13 :
Total Pages : 109 pages
Book Rating : 4.:/5 (123 download)
Download or read book Flame and Emissions Characteristics of a High-pressure Reacting Jet in Vitiated Crossflow written by Michelle Otero and published by . This book was released on 2020 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work was to provide more insight in the jet in crossflow interaction at relevant operating conditions found in a gas turbine. The first part of this work focus on understanding the influence of pressure on the jet in crossflow mechanism as well as and the effect on NOx levels. Jet conditions such equivalence ratio and momentum flux ratios were held constant throughout the study with the pressure of the system ranging from 1atm to 5atm. The flow structure and flame stabilization of the jets at different pressures were characterized using particle image velocimetry (PIV) and CH* chemiluminescence.
