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 Ignition Studies of Oxy syngas CO2 Mixtures Using Shock Tube for Cleaner Combustion Engines written by Samuel Evan Barak and published by . This book was released on 2018 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, syngas combustion was investigated behind reflected shock waves in order to gain insight into the behavior of ignition delay times and effects of the CO2 dilution. Pressure and light emissions time-histories measurements were taken at a 2 cm axial location away from the end wall. High-speed visualization of the experiments from the end wall was also conducted. Oxy-syngas mixtures that were tested in the shock tube were diluted with CO2 fractions ranging from 60% - 85% by volume. A 10% fuel concentration was consistently used throughout the experiments. This study looked at the effects of changing the equivalence ratios ([phi]), between 0.33, 0.5, and 1.0 as well as changing the fuel ratio ([theta]), hydrogen to carbon monoxide, from 0.25, 1.0 and 4.0. The study was performed at 1.61-1.77 atm and a temperature range of 1006-1162K. The high-speed imaging was performed through a quartz end wall with a Phantom V710 camera operated at 67,065 frames per second. From the experiments, when increasing the equivalence ratio, it resulted in a longer ignition delay time. In addition, when increasing the fuel ratio, a lower ignition delay time was observed. These trends are generally expected with this combustion reaction system. The high-speed imaging showed non-homogeneous combustion in the system, however, most of the light emissions were outside the visible light range where the camera is designed for. The results were compared to predictions of two combustion chemical kinetic mechanisms: GRI v3.0 and AramcoMech v2.0 mechanisms. In general, both mechanisms did not accurately predict the experimental data. The results showed that current models are inaccurate in predicting CO2 diluted environments for syngas combustion.
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 1963 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Shock Tube Study of the Ignition of Mixtures of N2O CO and written by Robert E. Case and published by . This book was released on 1973 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A shock tube was employed to determine the ignition limit curves of three mixtures of N2O, CO, and N2. The ignition limit curve, which separates the ignition and no-ignition zones, is an experimentally determined curve plotted on temperature-pressure coordinates. The test gas mixtures of N2O, CO, N2 were ignited by the temperature rise behind the reflected shock wave for pressures in the range of 5 to 65 atmospheres. A 2-inch inside diameter constant area shock tube employing a helium driver was used to generate this reflected shock wave. Limited results were obtained on ignition delay time for each of the three gas mixtures. (Modified author abstract).
Download or read book Shock Waves Marseille II written by Raymond Brun and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, there have been significant advances in the fields of high-enthalpy hypersonic flows, high-temperature gas physics, and chemistry shock propagation in various media, industrial and medical applications of shock waves, and shock-tube technology. This series contains all the papers and lectures of the 19th International Symposium on Shock Waves held in Marseille in 1993. They will be published in four topical volumes, each containing papers on related topics, and preceded by an overview written by a leading international expert. The volumes may be purchased independently.
Download or read book MILD Combustion Modelling Challenges Experimental Configurations and Diagnostic Tools written by Alessandro Parente and published by Frontiers Media SA. This book was released on 2021-11-26 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Tubes and Waves written by Charles E. Treanor and published by SUNY Press. This book was released on 1982-01-01 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings from a symposium on shock tubes and waves held July 6-9, 1981.
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 Investigation of Ignition in Propane Oxygen Argon Mixtures written by Karl Scheller and published by . This book was released on 1970 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ignition of propane-oxygen mixtures highly diluted with argon has been examined in the region behind a reflected shock wave in a single pulse shock tube. The measurements covered a temperature range of 1250-1600K at pressures varying from 2 to 10 atmospheres for mixture equivalence ratios of 0.125 to 2.0. For these conditions, observed induction times ranged from 12 to 600 microseconds. In one series of tests on a stoichiometric mixture, analyses were made of the shocked gas just prior to and immediately after ignition. These revealed that extensive pyrolysis of the propane preceded ignition. Mixture compositions and test conditions in this investigation were selected in such a manner that the influence of significant parameters on the ignition delay times could be clearly delineated. It was found that the experimental results of more than 150 tests were well correlated. (Author).
Download or read book A Shock Tube Study of the Ignition of Mixtures of N2O CO and N2 written by Robert Edward Case (CAPT, USAF.) and published by . This book was released on 1973 with total page 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 A Shock Tube Study of the Ignition Delay of Hydrogen air Mixtures Mear the Second Explosion Limit written by Roger Ronald Craig and published by . This book was released on 1966 with total page 62 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 1986 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Shock Tube Methods for Chemical Studies in High Temperature Gases written by R.K. Hanson and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development and Application of Aerosol Shock Tube Methods for the Study of Low vapor pressure Fuels written by Daniel Robert Haylett and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a new facility and method of experimentation, which can be used to study the combustion chemistry of low-volatility fuels in the gas phase. Two main goals are described: first, the development of the aerosol shock tube and procedures; and second, a demonstration of its capabilities. There is a lack of high-quality, accurate chemical kinetics data for the oxidation of large hydrocarbons, which are important for modeling diesel, rocket, or jet engines among other combustion systems. While conventional shock tubes are very effective reactor vessels for low-molecular-weight gaseous fuels (n-alkanes up to five carbon atoms), larger fuel molecules exist as low-volatility liquids/solids, and the vapor-pressures of these fuels are not large enough for high or even moderate fuel loadings. Heating the shock tube has extended the use of shock tubes to carbon numbers of 10 to 12, but beyond that, the high temperatures prior to the shock initiation can decompose the fuel, and (for fuel mixtures like diesel) can cause fractional distillation. The question is then: how can we study low-vapor-pressure fuels in a shock tube? The solution presented here, which avoids the problems associated with heating, is called the aerosol shock tube. In the aerosol shock tube, the fuel is injected as an aerosol of micron-size droplets. Then a series of shock waves first evaporate the fuel and subsequently raise the resultant purely gas-phase mixture to combustion-relevant temperatures. With proper selection of the shock strength and timing, this process effectively decouples the mass and heat transfer processes associated with evaporation from the chemical mechanism of combustion. This enables the study of extremely low-volatility fuels, never before studied in a purely gas-phase form in a shock tube. The first application of this new facility was to measure the ignition delay time for many previously inaccessible fuels in the gas-phase. In this thesis, we have measured ignition delay times for the pure surrogate fuel components n-decane, n-dodecane, n-hexadecane, and methyl decanoate as well as for multi-component fuels such as JP-7 and multiple different blends of diesel fuel. Taken over a range of conditions, these measurements provide sensitive validation targets for their respective chemical mechanisms. These data showed agreement with past heated shock tube experiments for fuels in which premature fuel decomposition is not an issue (n-decane and low concentration n-dodecane). However, when comparing heated and aerosol shock tube ignition delay times for fuels that require significant heating, like n-hexadecane, the existing heated shock tube data demonstrated evidence of premature decomposition. The second application to the study of chemical kinetics was to measure the concentration of important species during the decomposition and oxidation of select low-vapor-pressure fuels. These species time-histories provide much more information for kinetic mechanism refinement. Experiments were performed to measure the important OH radical and the stable intermediate C2H4 for both n-hexadecane and diesel. The number of important low-vapor-pressure fuels that require high-quality validation targets is large, and our new method for providing this data has proven very effective. This work enables the development of the next generation of accurate chemical mechanisms and will be essential to their success.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
