Download or read book Shock Tube laser Absorption Studies of Ringed Hydrocarbons and Their Precursors written by Sarah Elyse Johnson and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion, whether of fossil fuels or renewable fuels, is the dominant way the overwhelming demand for energy is currently met and will be for the foreseeable future. This has led to the production of harmful emissions that have a significant impact on the health of both the planet and humans. In order to improve the efficiency and cleanliness of combustion processes, improved knowledge of fundamental combustion chemistry is required. Recognizing the importance of understanding how intermediate species behave in combustion processes, particularly as related to the species that have been linked to forming harmful emissions, the work covered in this dissertation can be divided into two categories. The first is the development of diagnostics to measure key species that are intermediates in some combustion chemistry, and the second is experimental studies of ringed and small hydrocarbon decomposition chemistry employing those diagnostics, and the kinetic insights arising from that data. Arising from the need to characterize the decomposition chemistry of exo-tetrahydrodicyclopentadiene (JP-10), a diagnostic capable of measuring cyclopentadiene (CPD) in combustion conditions was developed. Using room temperature spectra and high temperature cross-section measurements, a diagnostic wavelength balancing high CPD absorbance with the existing knowledge base of other absorbing species was selected. This diagnostic was developed over a wide temperature range, and the absorbance of CPD characterized at other relevant wavelengths. The new CPD measurement tool was then employed in conjunction with a plethora of other laser diagnostics to characterize JP-10 pyrolysis chemistry between 1166 K to 1522 K at 2.5-3 atm. Using multiple measurement schemes and additional constraints, values for ethylene, propene, cyclopentadiene, methane, benzene, toluene, 1,3 butadiene, allene, and JP-10 fuel were reported, along with the overall decomposition rate constant for JP-10. Select portions of this data were used to constrain a HyChem model of JP-10 chemistry. Allene and propyne, two C3H4 isomers, were found to be intermediate species in the decomposition of many real fuels and contributors to forming polycyclic aromatic hydrocarbons, so it was desired to be able to measure their species time-histories. Employing the new capability of rapid scanning MIRcat-QCL lasers, the high temperature spectra of allene and propyne were measured for the first time. Using the measured spectra, wavelengths for allene and propyne diagnostics were selected carefully to minimize interference. Once selected, the diagnostics were characterized over 1196-1502 K, at 1.3-1.6 atm. These two tools were then used to measure the isomerization rates of allene to propyne and propyne to allene. These rate constants were found to be in good agreement with the average of past experimental determinations and recently computed rate expressions. Finally, small ringed hydrocarbon decomposition was studied, as these species are known to produce resonance-stabilized radicals that lead to PAH formation. Using the CPD diagnostic, improved and coupled with several other measurement tools, acetylene, ethylene, and cyclopentadiene time-histories were measured in cyclopentadiene and cyclopentene pyrolysis. Measurements for CPD pyrolysis were made over 1319 K to 1678 K at 1.2 - 1.5 atm, while cyclopentene measurements were made from 1220 K to 1681 K at pressures between 1.3 and 1.6 atm. Comparisons were made to multiple chemical kinetic models of different approaches, and the differences were examined. The work detailed in these studies illustrates the extensive capabilities that laser diagnostics employed on a shock tube provide for measuring combustion chemistry. The two new diagnostic tools developed for this work will enable future measurements of important combustion intermediates in real fuel chemistry, while the species time-histories and rate constants presented can be used to constrain and validate kinetic models.

Download or read book Shock Tube Studies of Hydrocarbon Fuels at Elevated Pressures written by Jiankun Shao and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock tube Studies of Vibrational Equilibration in Carbon Dioxide by Simultaneous Laser absorption and Infrared emission Measurements written by Stanford University. Department of Aeronautics and Astronautics and published by . This book was released on 1974 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Investigations of the Reaction Kinetics of Small Unsaturated Hydrocarbon Species written by Ravi Xavier Fernandes and published by Cuvillier Verlag. This book was released on 2004 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Study of Hydrogen oxygen Ignition Kinetics Via Laser Absorption written by Brian Morgan Spahnie and published by . This book was released on 1994 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock tube investigations of the reaction kinetics of small unsaturated hydrocarbon species written by and published by Cuvillier Verlag. This book was released on 2004-07-29 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube and Mid infrared Laser Absorption Measurements of Ignition Delay Times and Species Time histories written by Batikan Koroglu and published by . This book was released on 2016 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dissertation discusses the details of the four following items: 1) design, assembly, and testing of a shock tube setup as well as a laser diagnostics apparatus for studying ignition characteristics of fuels and associated reaction rates, 2) measurements of methane and propanal infrared spectra at room and high temperatures using a Fourier Transformed Infrared Spectrometer (FTIR) and a shock tube , 3) measurements of ignition delay times and reaction rates during propanal thermal decomposition and ignition, and 4) investigation of ignition characteristics of methane during its combustion in carbon-dioxide diluted bath gas. The main benefit and application of this work is the experimental data which can be used in future studies to constrain reaction mechanism development.

Download or read book Shock Tube Studies and Chemical Kinetic Modeling of Oxygenated Hydrocarbon Ignition written by Benjamin Akih Kumgeh and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Ignition Delay Studies of Hydrocarbon Components Found in Jet Fuels written by Hsi-Ping Shawn Shen and published by ProQuest. This book was released on 2008 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Shock Tube Ignition Studies of CO2 2 Diluted Mixtures written by Owen Marcus Pryor and published by . This book was released on 2016 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental data for ignition delay times and species time-histories (CH4) were obtained in mixtures diluted with CO2. Experiments were performed behind reflected shockwaves from temperatures of 1200 to 2000 K for pressures ranging from 1 to 11 atm. Ignition times were obtained from emission and laser absorption measurements. Current experimental data were compared with the predictions of detailed chemical kinetic models (available from literature) that will allow for accurate design and modeling of combustion systems.

Download or read book Shock Tube Measurements of Elementary Oxidation and Decomposition Reactions Important in Combustion Using OH CH and NCN Laser Absorption written by Venkatesh Vasudevan and published by . This book was released on 2007 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Shock Tube Study of NO subscript X Reactions Involving CH and C atoms Using Laser and Atomic Resonance Absorption Diagnostics written by Anthony John Dean and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 1990 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Free Piston Shock Tube and Infrared Radiation Studies written by Tony Tong Chun Hsieh and published by . This book was released on 1972 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Summaries of FY Research in the Chemical Sciences written by and published by . This book was released on 1989 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Studies of Cyclopentane and Cyclohexane Ignition at High Pressures written by Shane M. Daley and published by . This book was released on 2007 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: