Download or read book Temperature Imaging in Unsteady Propane air Counterflow Diffusion Flames Using Planar Laser induced Fluorescence of OH written by Dawn A. Santoianni and published by . This book was released on 1999 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous Particle Imaging Velocimetry and OH Planar Laser Induced Fluorescence Measurements in an Unsteady Counterflow Propane Air Diffusion Flame written by and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: To study the transient response of a diffusion flame to an unsteady flowfield, quantitative measurements of velocity, using particle-imaging velocimetry, and OH measurements, using planar laser-induced fluorescence, were made simultaneously in an oscillating counterflow diffusion flame. These non-intrusive measurements were performed to spatially and temporally resolve flowfield and flame characteristics as a function of initial steady strain rate and forcing frequency. For the forcing frequencies considered in this study, the strain rate fluctuations were found to lag the velocity fluctuations, but the phase difference decreased with increasing forcing frequency. At lower forcing frequencies, the width of the OH field responded quasi-steadily, but as the forcing frequency increased, the OH field showed transient effects. The dilatation velocity, defined as the difference between the minimum velocity in the preheat zone and the maximum velocity in the reaction zone, was used as a flame temperature indicator. The dilatation velocity revealed that the phase difference between the velocity and the temperature increased with increasing forcing frequency, confirming the existence of a diffusion limited response. The results presented here help to illuminate the interconnecting relationships between the chemistry, fluid dynamics, and reactant transport times.
Download or read book Planar Temperature Imaging Using Thermally Assisted Laser Induced Fluorescence of OH in a Methane air Flame written by Colin Copeland and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two dimensional Temperature Images of a Hydrogen air Counterflow Diffusion Flame Using Laser Induced Fluorescence of the Hydroxyl Radical written by Cory Allen Cataldo and published by . This book was released on 1996 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectroscopic Studies of Inhibited Opposed Flow Propane air Flames written by and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planar laser induced fluorescence (PLIF) and laser induced fluorescence are used to measure relative OH concentration profiles and maximum flame temperatures in an atmospheric pressure, opposed flow, propane (C3H8)/air flame. Flame inhibiting agents CF3Br, N2, Fe(CO)5, FM-200, FE-36, DMMP, and PN were added to the flame, and relative OH concentration profiles and peak flame temperatures were measured as each flame approached extinction. The measured OH profiles illustrate that adding N2, FM-200, and FE- 36 to the flame produced smaller changes in OH concentrations relative to CF3Br, implying these agents have chemical inhibition capacities less than CF3Br. However, adding DMMP and Fe(CO)5 to the flame demonstrated chemical inhibition capabilities greater than CF3Br, - with larger changes in OH concentrations; similar trends are observed for peak flame temperatures. CF3Br, PN, DMMP, and Fe(CO)5 have temperature values (1600-1800 K) that are lower than the uninhibited flame peak temperature (2200 K). OH profile widths were measured in the uninhibited flame and in each inhibited flame with inhibitor addition at 50% of determined extinction concentrations. Profile widths for CF3Br, PN, DMMP, and Fe(CO)5 were at least 20% less than the uninhibited flame. Numerical modeling of a stoichiometric, premixed, C3H8/air flame inhibited by DMMP, Fe(CO)5, CF3Br, and N2 indicated DMMP and Fe(CO)5 have greater decreases in burning velocities and OH relative to CF3Br.
Download or read book Spectroscopic Studies of Inhibited Opposed Flow Propane air Flames written by and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planar laser induced fluorescence (PLIF) and laser induced fluorescence are used to measure relative OH concentration profiles and maximum flame temperatures in an atmospheric pressure, opposed flow, propane (C3H8)/air flame. Flame inhibiting agents CF3Br, N2, Fe(CO)5, FM-200, FE-36, DMMP, and PN were added to the flame, and relative OH concentration profiles and peak flame temperatures were measured as each flame approached extinction. The measured OH profiles illustrate that adding N2, FM-200, and FE- 36 to the flame produced smaller changes in OH concentrations relative to CF3Br, implying these agents have chemical inhibition capacities less than CF3Br. However, adding DMMP and Fe(CO)5 to the flame demonstrated chemical inhibition capabilities greater than CF3Br, - with larger changes in OH concentrations; similar trends are observed for peak flame temperatures. CF3Br, PN, DMMP, and Fe(CO)5 have temperature values (1600-1800 K) that are lower than the uninhibited flame peak temperature (2200 K). OH profile widths were measured in the uninhibited flame and in each inhibited flame with inhibitor addition at 50% of determined extinction concentrations. Profile widths for CF3Br, PN, DMMP, and Fe(CO)5 were at least 20% less than the uninhibited flame. Numerical modeling of a stoichiometric, premixed, C3H8/air flame inhibited by DMMP, Fe(CO)5, CF3Br, and N2 indicated DMMP and Fe(CO)5 have greater decreases in burning velocities and OH relative to CF3Br.
Download or read book PLIF Imaging of Species and Temperature Distributions in Spray Flames written by and published by . This book was released on 1990 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Phase I SBIR program investigated the application of Planar Laser-Induced Fluorescence (PLIF) to measurements of species concentration and temperature distributions in liquid-fueled spray flames. A bench-top spray burner was constructed and characterized with n-heptane fuel. Using laser sheet illumination, time-averaged and instantaneous distributions of the OH radical were obtained. Ratios of time-averaged OH distributions obtained from two isolated rotational levels were used to infer the time-averaged temperature in the hot, combustion product gases. Comparison of the PLIF temperature data with thermocouple scans suggest the technique is accurate to within about 5 percent. Time-averaged and mean distributions of NO seeded into the primary, atomizing air stream were also obtained. Preliminary ratios of two NO PLIF images obtained from separate rotational excitation were used to infer temperature in the cold, evaporating region of the flame. Initial relative temperature distributions appear correct, but further work is required to recover the absolute level. Using multiphoton photodissociation, instantaneous measurements of the C2H2 (and potentially other hydrocarbon fragments) were obtained in the pyrolyzing region of flame. The technique also revealed the instantaneous structure of the reaction zone ... PLIF, Laser-induced fluorescence, OH, NO, Photodissociation, C H, LIF thermometry.
Download or read book Temperature Measurements in Gases Using Planar Laser induced Fluorescence Imaging of NO and O2 written by Michael Poliang Lee and published by . This book was released on 1991 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three techniques based on Planar Laser-Induced Fluorescence (PLIF) have been developed for the measurement of 2-D temperature fields in gaseous flows. The methods are applicable to a wide range of aerodynamic and combustion flows.
Download or read book Planar Laser induced Fluorescence Imaging of Lifted H2 air Flames written by P. H. Paul and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Measurements in Gases Using Planar Laser induced Fluorescence Imaging of NO and O p2 s written by Michael Poliang Lee and published by . This book was released on 19?? with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three techniques based on Planar Laser-Induced Fluorescence (PLIF) have been developed for the measurement of 2-D temperature fields in gaseous flows. The methods are applicable to a wide range of aerodynamic and combustion flows.
Download or read book Chemical and Physical Processes in Combustion written by Combustion Institute (U.S.). Eastern States Section. Fall Technical Meeting and published by . This book was released on 2001 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1986 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Gas Phase Fire Suppression Mechanisms in Laminar Counterflow Diffusion Flames written by Jaeil Suh and published by . This book was released on 1997 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Blowoff of Propane and Hydrogen Diffusion Flames at High Mach Number Ramjet Conditions written by Robert J. Bacigalupi and published by . This book was released on 1959 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Local Displacement Speeds of Wrinkled Unsteady Flames written by José Oscar Sinibaldi and published by . This book was released on 1998 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow and Combustion in Advanced Gas Turbine Combustors written by Johannes Janicka and published by Springer Science & Business Media. This book was released on 2012-10-29 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: With regard to both the environmental sustainability and operating efficiency demands, modern combustion research has to face two main objectives, the optimization of combustion efficiency and the reduction of pollutants. This book reports on the combustion research activities carried out within the Collaborative Research Center (SFB) 568 “Flow and Combustion in Future Gas Turbine Combustion Chambers” funded by the German Research Foundation (DFG). This aimed at designing a completely integrated modeling and numerical simulation of the occurring very complex, coupled and interacting physico-chemical processes, such as turbulent heat and mass transport, single or multi-phase flows phenomena, chemical reactions/combustion and radiation, able to support the development of advanced gas turbine chamber concepts
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
