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Thursday, July 23, 2020 | History

2 edition of Chemical kinetic analysis of hydrogen-air ignition and reaction times found in the catalog.

Chemical kinetic analysis of hydrogen-air ignition and reaction times

R. Clayton Rogers

Chemical kinetic analysis of hydrogen-air ignition and reaction times

by R. Clayton Rogers

  • 314 Want to read
  • 38 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Hydrogen,
  • Chemical kinetics

  • Edition Notes

    StatementR. Clayton Rogers and Charles J. Schexnayder, Jr
    SeriesNASA technical paper -- 1856
    ContributionsSchexnayder, Charles J, Langley Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    Pagination51 p. :
    Number of Pages51
    ID Numbers
    Open LibraryOL14932926M

    A numerical and experimental investigation in to the role of gasoline surrogates and their reduced chemical kinetic mechanisms in spark ignition (SI) engine knocking has been carried out. In order to predict autoignition of gasoline in a spark ignition engine three reduced chemical kinetic mechanisms have been coupled with quasi-dimensional. A wealth of experimental and numerical investigations can be found in the literature on the formation of oblique detonation wave (ODW) when a hypersonic blunt projectile is launched into combustible mixtures, e.g., References [10,11,12,13,14,15,16,17,18,19].These studies focus primarily on the conditions required to initiate an oblique detonation wave in the combustible : Chian Yan, Hong Hui Teng, Xiao Cheng Mi, Hoi Dick Ng.

    A chemical kinetic model is used to study the combustion characteristics of hydrogen under conditions found in internal combustion engines. Laminar flame speeds are predicted under the high-pressure and high-temperature conditions found in a spark-ignition engine. The variation of laminar flame speed with temperature, pressure, and equivalence ratio is examined. Furthermore, Reaction Design does not warrant, guarantee, or make any representations regarding the use or the results of the u se, of the software or documentation in terms of correctness, accuracy, reliability or otherwise. No agent of Reaction Design is authorized to alter or exceed the warranty obligations of Reaction Design as set forth.

    Laminar flame speeds and ignition delay times have been measured for hydrogen and various compositions of H 2 /CO (syngas) at elevated pressures and elevated temperatures. Two constant-volume cylindrical vessels were used to visualize the spherical growth of the flame through the use of a schlieren optical setup to measure the laminar flame speed of the by: reaction volume is given, and T, u, and Wk if the pressure is given. The equation system can be solved numerically using the backward differentia­ tion formula code DASSL [20] or the extrapolation code LIME X [21]. Cpu times are less then 1 s on a CRA Y -1 computer. .


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Chemical kinetic analysis of hydrogen-air ignition and reaction times by R. Clayton Rogers Download PDF EPUB FB2

Chemical Kinetic Analysis of Hydrogen-Air Ignition and Reaction Times R. Clayton Rogers and Charles J. Schexnayder, Jr. Langley Research Center Hampton, Virginia NI SA National Aeronautics and Space Administration Scientific and Technical Information Branch File Size: 1MB.

Chemical kinetic analysis of hydrogen-air ignition and reaction times. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.

hydrogen-air mixtures and the ignition delay data at atm for stoichiometric hydrogen-air mixtures con- taining and percent nitric oxide. To com- pare the kinetic behavior predicted by the reaction mechanism with the experimental results, numericalFile Size: 1MB.

Based on the analysis of the databases published in the scientific literature and concerned with the reaction rate constants in the H 2 /O 2 system, a new kinetic mechanism is suggested for describing the processes of ignition, combustion, and detonation in hydrogen–oxygen gaseous mixtures.

Attention is mainly focused on consideration of a low-temperature region (T Cited by: Measurements on ignition delay times of propane/hydrogen mixtures in argon diluted oxygen were conducted for hydrogen fractions in the fuel mixtures (X H 2) from 0 to %, pressures ofand 10 atm, and temperatures from to K using the shock-tube.

Results show that for X H 2 less than 70%, ignition delay time shows a strong Arrhenius temperature dependence and it decreases Cited by: For high-temperature acetylene-oxygen ignition and detonation under conditions that are not excessively fuel rich, there is a relatively simple chemical-kinetic description of the fast chemistry.

The fuel consumption proceeds mainly through ketyl and ketene at high temperature and through vinyl and ketene at lower temperatures for higher by: @article{osti_, title = {Detailed and global chemical kinetics model for hydrogen}, author = {Marinov, N M and Westbrook, C K and Pitz, W J}, abstractNote = {Detailed and global chemical kinetic computations for hydrogen-air mixtures have been performed to describe flame propagation, flame structure and ignition phenomena.

Simulations of laminar flame speeds, flame compositions and. Detailed and global chemical kinetic computations for hydrogen-air mixtures have been performed to describe flame propagation, flame structure and ignition phenomena.

Simulations of laminar flame speeds, flame compositions and shock tube ignition delay times have been successfully by: The induction times shown in Figs.

1 and 2 were computed using the detailed chemical reaction mechanisms for 8 species (H 2 O, H 2, H, O 2, O, OH, HO 2, H 2 O 2) for different chemical.

“Chemical kinetics analysis of hydrogen-air ignition and reaction times,” NASA TP Rossmann, T., Mungal, M. G., and Hanson, R. “An experimental investigation of high-compressibility non-reacting mixing layers,” AIAA Paper –Cited by: 4.

The analysis uncovers the existence of: (i) An ignition regime, in which a mixing layer develops with only minor effects of the chemical reaction, until a thermal runaway occurs somewhere within. for Hydrogen/Air/Nitrogen at °C and 1 bar For hydrogen, the minimum ignition energy is low at mJ for mixtures with air (ISO, ), and even lower at mJ for mixtures with oxygen (Kuchta, ).

Hydrogen has a such a low minimum ignition energy that it is often difficult to determine the exact mechanism and cause of anFile Size: 1MB. A detailed chemical reaction mechanism of hydrogen (called UT-JAXA) proposed by one of the authors [21] is used to compute the chemical reaction rates.

The present mechanism consists of 9 species (H 2, H, O 2, O, OH, HO 2, H 2O 2, H 2O, and N 2) and 34 elementary reactions. The accuracy of the. Thus, the aim of this study is to identify reaction mechanisms that accurately represent ammonia kinetics over a large range of conditions, particularly at industrial conditions.

To comprehensively evaluate the performance of the chemical mechanisms, 12 mechanisms are tested in terms of flame speed, NO x emissions and ignition delay against the Cited by: The ignition evolution in the supersonic nonpremixed hydrogen/air laminar mixing layer, consisting of a relatively hot, fast air stream next to a cold, slower hydrogen stream, was computationally simulated using detailed transport and chemical reaction mechanisms and compared with results from asymptotic analysis with reduced mechanisms.

Finally, it is argued that at the conditions of interest ignition delay data do not represent pure chemical‐kinetic observations but are affected by phenomena that are in some measure facility specific. This hampers direct cross comparison of the experimental ignition data collected in different by: A comprehensively tested H 2 /O 2 chemical kinetic mechanism based on the work of Mueller et al.

1 and recently published kinetic and thermodynamic information is presented. The revised mechanism is validated against a wide range of experimental conditions, including those found in shock tubes, flow reactors, and laminar premixed by: hydrogen/air, ignition delay time, correlation, HDMR Citation: Zhao Z L, Chen Z, Chen S Y.

Correlations for the ignition delay times of hydrogen/air mixtures. Chinese Sci Bull,–, doi: / s Ignition delay time or reaction time [1–3] is one of the most. ignition times, the constant pressure ignition times continue to decrease as the initial temperature of the gas increases.

The ratio of 2-D to 0-D ignition times for K, K, K and K 25, 38 and 63 respectively. The large di erences observed between the two types of simulations are due to. Learn more about these metrics Article Views are the COUNTER-compliant sum of full text article downloads since November (both PDF and HTML) across all institutions and individuals.

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vapor on the auto-ignition delay times of hydrogen / air mixtures at pressures ranging from and atm and for temperatures comprised between and K. As far as binary mixtures of methane and hydrogen are concerned, the only study available in the.PUBLICATIONS After Professor: Chih-Jen (Jackie) Sung Click here for the complete list of publications before RIGOROUSLY-REFERRED PUBLICATIONS: C.

J. Sung, J. G. Li, G. Yu, and C. K. Law, ”Chemical Kinetics and Self-Ignition in A Model Author: Orlando Echevarria. It is shown that addition of a small (within 20%) amount of silane to the hydrogen–air mixture in the temperature range from to K leads to significant reduction of the ignition delay time of the mixture, whereas there is only a minor decrease in Cited by: 5.