Download or read book A Shock Tube Study of the High Temperature Reactions of Nitrogen with Hydrocarbons written by Vithal Vasudev Rao and published by . This book was released on 1966 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Shock Tube in High Temperature Chemical Physics written by Alfred Gordon Gaydon and published by . This book was released on 2013-03 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Shock Tube Study of the High Temperature Reactions of Nitrogen with Hydrocarbons microform written by Vithal Vasudev Rao and published by National Library of Canada. This book was released on 1966 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the kinetics and mechanism of gas phase reactions at high temperatures by a single pulse shock tube written by אכבה בר-נון and published by . This book was released on 1968 with total page 80 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 A Shock tube Investigation of the Chemical Kinetics of NOC OA r Mixtures written by Lewis Phillip Leibowitz and published by . This book was released on 1969 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Study of Nitrogen containing Fuels written by Sijie Li and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The combustion chemistry of nitrogen-containing fuels is important in the study of bio-derived fuels and nitrogen-based propellants. However, little high-quality shock tube kinetics data exists for these systems. The primary objective of the research presented in this dissertation is to augment the experimental database and to improve understanding of the chemical kinetics for four nitrogen-containing fuels: morpholine, dimethylamine, ethylamine and monomethylhydrazine. Morpholine (C4H9NO, 1-oxa-4-aza-cyclohexane) is a good representative candidate of a nitrogen-containing fuel because of its cyclic structure and wide industrial applications. Morpholine ignition delay times were measured behind reflected shock waves. A morpholine mechanism was developed based on this shock tube study and previous works in the literature. The simulations from this morpholine mechanism were in good agreement with the current morpholine experiments as well as previous morpholine flame data. Refinement of this morpholine mechanism required improvements in the sub-mechanisms of two major intermediate species dimethylamine and ethylamine, as discussed in a progressive manner in this dissertation. The overall rate constants of hydroxyl radicals (OH) with dimethylamine (DMA: CH3NHCH3) and ethylamine (EA: CH3CH2NH2) were measured behind reflected shock waves using UV laser absorption of OH radicals near 306.7 nm. The overall rate constants were determined by fitting the measured OH time-histories with the computed profiles using the detailed dimethylamine and ethylamine sub-mechanisms contained in the morpholine mechanism. Variational transition state theory was used to compute the H-abstraction rates by OH for dimethylamine and ethylamine. The calculated reaction rate constants are in good agreement with the experiment. The calculated reaction rate constants were used to update the morpholine mechanism for simulations in the following sections. Dimethylamine (DMA) ignition delay times and OH time-histories were investigated behind reflected shock waves. The dimethylamine ignition delay time measurements were carried out in 4% oxygen/argon. OH time-histories were measured in stoichiometric mixtures of 500 ppm DMA/O2/argon. The morpholine mechanism was then updated by adding the DMA unimolecular decomposition channel: DMA = CH3NH + CH3. With this modification, the simulation results are in excellent agreement with both the dimethylamine ignition delay times and OH time-history data. Ethylamine (CH3CH2NH2) pyrolysis and oxidation were studied behind reflected shock waves. For ethylamine pyrolysis, NH2 time-histories were measured in 2000 ppm ethylamine/argon mixtures. For ethylamine oxidation, ignition delay times, NH2 and OH time-histories were measured in ethylamine/O2/argon mixtures. By fitting the simulations to the early time-histories of NH2 and OH, the rate constants for the two major ethylamine decomposition pathways in the morpholine mechanism were updated for better agreement with the experiment. In addition, recommendations from recent theoretical studies of ethylamine radical reactions were implemented. With these modifications, the final updated morpholine mechanism provides significantly improved agreement with the species time-history measurements and the ignition delay times of ethylamine. The morpholine mechanism, after implementing the aformentioned updates based on the dimethylamine and ethylamine data, was compared with the morpholine ignition delay time data again. It was shown that those modifications improve the agreements of the mechanism with the morpholine data. Amine groups are common structural features for rocket propellants as well, and using the same approach as above, the pyrolysis of an important propellant monomethylhydrazine (MMH) was studied using NH2 time-histories in MMH/argon mixtures. The MMH pyrolysis mechanism developed by Sun et al. (2009), with the updates by Cook et al. (2011), was used to compare with the experiment. The rate constant of the reaction: MMH = CH3N.H + NH2 was determined based on early time of the NH2 time-histories. Pressure dependence of this reaction was observed at 0.3-5 atm. The measured reaction rate constants follow a pressure dependence trend close to the theoretical results by Zhang et al. (2011) based on transition state theory master equation analysis. Using the high and low-pressure limit expressions by Zhang et al., a new Troe's expression in the fall-off region was proposed based on the current experimental data. Utilizing the later times of the NH2 time-histories, a new reaction rate expression was recommended for the reaction: NHNH2 + H = NH2 + NH2.

Download or read book Shock Tube Studies of Ignition and the High Temperature Reactions of Flame Inhibitors written by Bijan Vakilzadeh and published by . This book was released on 1980 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Studies of Nitrogen Vibrational Relaxation and Methane Oxidation written by Donald R. White and published by . This book was released on 1970 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the research performed under this contract in the general areas of vibrational relaxation and shock tube chemistry. The authors have unsuccessfully attempted to generate cylindrical detonations in H2-O2 under conditions such that the reaction zone and shock front could be observed first to separate and hopefully then to reattach. The induction time for methane has been measured over a wide range of pressure, temperature, stoichiometry, and diluent using both incident and reflected shock waves. An activation energy of about 51 kcal/mole is found, larger than that of several other investigators largely due to our observation of longer times at the lower temperatures. In the H2/CO/O2 system the combination of flame and interferometric shock data has earlier proved valuable in selection from among alternative kinetic schemes, but laminar reaction zones have been unattainable in methane oxidation without use of an additive to speed the reaction. Qualitatively, acetone, methyl alcohol, and acetylene all accelerate the reaction to a decreasing extent. Hydrogen has been used as an additive to obtain density profiles adequate for comparison with computed profiles using a complex reaction scheme. A first attempt at computer reconciliation of flame and shock tube data has been made with encouraging results, and changes to be incorporated in the next iteration of the kinetic system have been identified. (Author).

Download or read book A Shock Tube Study of the Stability and Reactions of Halocarbons and Other Compounds at High Temperatures written by John Haydn Llewellyn and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Shock Tube Study of the H2 O2 CO Ar and H2 N2O CO Ar Systems written by Anthony M. Dean and published by . This book was released on 1977 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emissions at 450 nm and 4.27 micrometers have been measured when a variety of mixtures containing H2, CO, either O2 or N2O, and Ar were heated behind reflected shock waves to temperatures of 2000-2850 K and total concentrations near 5 x 10 to the 18th power molecule/cc. These emissions were used to obtain absolute concentration - time data for both oxygen atoms and carbon dioxide. The data were then compared to the results of numerical integrations of the likely mechanisms. It was observed that quantitative agreement between calculations and observations were obtained for the H2/CO/O2/Ar system using recent high temperature literature rate constants. For the H2/CO/N2O/Ar system, the rate constant for the reaction: H + N2O yields N2 + OH was adjusted so as to fit the data. Here it was found that a good fit to both (O) and (CO2) profiles could be achieved with k = 3 x 10 to the -9th power exp( -113kJ/RT) cc/molecule. Comparison to data at lower temperatures suggests that this might be another example of a 'Non-Arrhenius' rate constant. The implications of these results to studies of hydrocarbon oxidation are discussed. (Author).

Download or read book Reaction Times of Hydrocarbon Oxidation Behind Incident Shock Waves in a Shock Tube written by B. F. Myers and published by . This book was released on 1968 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: An empirical relationship has been derived between the temperature, pressure, and composition existing behind an incident shock wave before chemical reaction begins and the 'reaction time' and 'ignition delay time' for the oxidation of propane. To obtain this relationship, the assumptions were made in the data reduction that shock wave attenuation and boundary layer growth had negligible systematic effects and that the coupling between the changing temperature, pressure and the extent of reaction could be adequately accounted for by a 'density step' model. Furthermore, the oxidation of propane is an exothermic process and this introduces fluid dynamic instabilities. Experimental evidence of these instabilities is presented for the oxidation of propane and criteria for these instabilities are applied to the conditions of the experiments.

Download or read book Shock tube Study of the Reaction H O2 Ar rightward pointing Arrow HO2 Ar written by Casimir J. Jachimowski and published by . This book was released on 1972 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock Tube Research Proceedings of the Eighth International Shock Tube Symposium Imperial College London 5 8 July 1971 written by J. L. Stollery and published by Chapman & Hall. This book was released on 1971 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Rate of Pyrolysis of Nitrogen Dioxide in a Shock Tube written by Frederick Newcombe Alyea and published by . This book was released on 1962 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Shock Tube Study of the Reaction Between H2 and CO2 written by John Carter Matthews and published by . This book was released on 1965 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Production of Very High Temperatures in the Shock Tube written by Eugene Bonner Turner and published by . This book was released on 1956 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: