Criteria for self-ignition of supersonic hydrogen-air mixtures

by Paul W. Huber

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

Written in English
Published: Pages: 54 Downloads: 972
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Subjects:

  • Airplanes -- Motors -- Ignition.,
  • Combustion, Spontaneous -- Mathematical models.

Edition Notes

StatementPaul W. Huber, J. Schexnayder, Jr., and Charles R. McClinton.
SeriesNASA technical paper -- 1457.
ContributionsSchexnayder, Charles J., McClinton, Charles R., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., Langley Research Center.
The Physical Object
Pagination54 p. :
Number of Pages54
ID Numbers
Open LibraryOL15258684M

Deflagration and Detonation Deflagration: • Subsonic, typically 1 m/s and 7 to 10 bar starting at ambient pressure Detonation: • Supersonic • High pressure shock front ahead of the reaction zone (i.e. flame) • Adiabatic compression – gas autoignites • Average pressure 15 to 19 bar (lean), 25 to 30 bar (stoichiometric) • Typical peak pressure up to 50 bar (but see later)File Size: KB.   Next, we focus on the chemical reaction effects on the jets with a premixed hydrogen–air mixture injection. The results reveal that the shock-induced combustion develops into a detonation, inducing numerous vortices behind the combustion wave, while the combustion in the mixing layer cannot be preserved due to the instability of the. "On the Effect of Pressure on Intrinsic Flame Instabilities in Lean Hydrogen-Air Mixtures – Part II: Experimental Investigation Based on OH-PLIF Technique" P. Katzy, J. Hasslberger, and and T. Sattelmayer Proceedings of the 26th International Colloquium on the Dynamics of Explosions and Reactive Systems, Paper , Paper (PDF). 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 Supersonic Hydrogen-Air Combustor,” AIAA Journal 3 Author: Orlando Echevarria.

  Free Online Library: A Numerical Investigation of Ignition of Ultra-Lean Premixed [2]/Air Mixtures by Pre-Chamber Supersonic Hot Jet.(Report) by "SAE International Journal of Engines"; Transportation industry Combustion Analysis Investigations Gas powered engines Models Hydrogen as fuel Chemical properties Hydrogen fuels Jet airplanes Jet planes . For mixtures of fuel and air, propagation of flames is sustainable within a composition range between the so-called lean and rich flammability limits. These depend on combustion factors such as ignition energy, initial pressure, initial temperature, and relative humidity. The flammability limits of hydrogen–air mixtures are between File Size: KB. ever, greatly change the limits in certain cases. Many mixtures dis­ play a marked increase in the value of the upper limit as the initial mixture pressure is increased above atmospheric. Concurrently, the lower limit can be expected to decrease. Not all fuel-air mixtures so behave, however. Carbon monoxide-air and hydrogen-air mixtures, for. Composition distribution and equivalent body shape for a reacting, coaxial, supersonic hydrogen-air flow / (Washington, D.C.: National Aeronautics and Space Administration ; [For sale by the Clearinghouse for Federal Scientific and Technical, Springfield, Virginia ], ), by Griffin Y. Anderson, William Roger Russin, Anthony M. Agnone.

  Note presenting a determination of the effect of initial temperatures from about to degrees Kelvin on the laminar burning velocity of hydrogen-air mixtures from schileren photographs of open flames. The temperature was raised in two ways: preheating the hydrogen-air mixtures and simulated adiabatic preburning of part of the hydrogen so that initial Cited by:   Power mixture and acceleration: percent CO or a air/fuel mixture for a normal engine; a high performance engine with improved combustion chamber design such as a Pro-Stock or a Winston. A review of recent experimental studies of non-equilibrium plasma assisted ignition and combustion is given in [Starikovskaia&Starikovskii, ]. There is also a detailed review of experimental and theoretical work in this field for H 2-O 2 mixtures [Popov, ]. Over the last years, considerable progress has been made in the understanding of Cited by: Start studying ASVAB Auto and Shop 2. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Criteria for self-ignition of supersonic hydrogen-air mixtures by Paul W. Huber Download PDF EPUB FB2

Tives 1 and 3 of the preceding paragraph) of supersonic hydrogen-air mixtures in combustors of the type contemplated for hypersonic propulsion systems. To accanplish this objective, correlations are made between the geometry and self- ignition conditions from a variety of published experimental studies as well as.

Criteria for self-ignition of supersonic hydrogen-air mixtures / By Paul W. (Paul William) Huber, Charles R. McClinton, Charles J. Schexnayder, Langley. 1 SELF-IGNITION OF HYDROGEN-NITROGEN MIXTURES DURING HIGH-PRESSURE RELEASE INTO AIR Rudy, W.1, Teodorczyk, A.2 and Wen, J.3 1 Warsaw University of Technology, Institute of Heat Engineering, Nowowiejska 21/25,Warsaw, Poland, [email protected] 2 Warsaw University of Technology, Institute of Heat Engineering, File Size: 1MB.

The effect of hydrogen admixing on self-ignition of homogeneous and hybrid mixtures of heavy hydrocarbons in air is studied theoretically based on the detailed reaction mechanism of n-decane oxidation. Reactivity of hydrogen-containing mixtures is not always higher than that of pure hydrocarbon–air mixtures.

5. Self-ignition of hybrid hydrocarbon (drops) – hydrogen – air mixtures. The reaction mechanism of Section 2 was then used to study the effect of hydrogen addition on the self-ignition delay time of hybrid hydrocarbon drops–hydrogen–air mixtures. The calculations of ignition and combustion of such mixtures were performed using DROP by: Simulations indicate that hydrogen can successfully cause self-ignition of propane-air mixtures in catalytic micro-channels with a mm gap size, eliminating the need for startup Criteria for self-ignition of supersonic hydrogen-air mixtures book.

The minimum hydrogen composition for propane self-ignition is found to be in the range of % (on a molar basis), and increases with increasing wallCited by: 1.

NUMERICAL ANALYSIS OF DETONATION PROPENSITY OF HYDROGEN-AIR MIXTURES WITH ADDITION OF METHANE, ETHANE OR PROPANE Jach, A., and Teodorczyk, A. These supersonic combustion waves produce The self-ignition of gaseous combustible mixtures can be investigated in the shock tubes.

One of the. 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 an ignition when it Size: 1MB.

hydrogen/air mixture ranging from 21 to vol. % of hydrogen. This tent was covered by a thin plastic sheet (thickness; mm). Hydrogen was channelled into the tent from compressed gas bottles, and mixed with the air inside.

Subsequently, as the hydrogen concentration stabilized, the hydrogen/air mixture was stirred using motorized Size: KB. hydrogen peroxide, learn its preparatory methods and properties leading to the manufacture of useful chemicals and cleaning of environment; • understand and use certain terms e.g., electron-deficient, electron-precise, electron-rich, hydrogen economy, hydrogenation etc.

HYDROGEN Hydrogen, the most abundant element in the universe and theFile Size: KB. Regimes of Supersonic Combustion: Detonation Waves.

Part of the Shock Wave and High Pressure Phenomena book series (SHOCKWAVE) Abstract. Detonation is the most destructive regime of combustion and, though this process is an infrequent occurrence in the real life, especially in hydrogen + air mixtures, its characteristics are analyzed Author: Boris E.

Gelfand, Mikhail V. Silnikov, Sergey P. Medvedev, Sergey V. Khomik. Criteria holding in H2-fueled scramjet engines have been discussed by approximating the recirculation zone in the combustor with a perfectly stirred reactor. The of rates and reactor volumes holding can be summarized by a critical reaction time in the recirculation by: However, a confined mixture of hydrogen with air or oxygen can be detonated by a relatively small ignition source.

2 confining wall. (A pressure ratio of 20 means psi if the mixture is at atmospheric pressure.) When the wave strikes an obstacle, the pressure ratio seen by the obstacle is between 40 and File Size: KB. The work on the ignition energy and the likelihood of ignition of methane-hydrogen-air mixtures was carried out at Loughborough University using a purpose built test facility.

The approach adopted followed the method initiated by Lewis and von File Size: KB. Criteria for Self-Ignition of Supersonic Hydrogen-Air Mixtures, ().

Hypersonic and High Temperature Gas Dynamics,Author: David R. Buttsworth and Peter A. Jacobs. RE: Self Ignition of Hydrogen (Chemical) 7 Apr 03 to quark, if you are speaking of reactors, the hydrogenation catalysts therein may be able to reduce the activation energy of hydrogen ignition with oxygen to lower levels than normally needed for self-ignition; kenvlach 's comments rounded up items on this subject.

Boundary layer ignition of hydrogen-air mixtures in supersonic flows. Abstract. Due to viscous heating spontaneous ignition of a supersonic flow of premixed combustible gases can occur in boundary layers. This process is studied numerically for a hydrogen-air mixture in the case of a laminar boundary layer over a flat by: 2.

The scramjet is an airbreathing hypersonic propulsion system that utilizes atmospheric oxygen for combustion. Hence, the oxidizer does not have to be carried on-board, which makes scramjets more efficient than rockets and thus very attractive for hypersonic transportation or access-to-space by: 5.

ope of parameter combinations that mitigate or enhance spontaneous ignition characteristics of compressed hydrogen as a result of sudden release, particularly if hydrogen is to become a major energy carrier interfaced with consumer use.

Similar considerations for compressed methane, for mixtures of light hydrocar. (). Auto-ignition of a homogeneous hydrogen–air mixture subjected to unsteady temperature fluctuations. Combustion Theory and Cited by: 5. Simulation of a supersonic hydrogen-air autoignition-stabilizedflame using reduced chemistry P.

Boivina,∗, A. Dauptainc, C. Jime´neza,b, B. Cuenotc aDept. Ingenier´ıaTe´rmica y de Fluidos, Universidad Carlos III de Madrid, Legane´s, Spain bCentro de InvestigacionesEnerge´ticas,Medioambientalesy Tecnolo´gicas, Madrid, Spain cCentre.

A correlation of available self ignition data for supersonic hydrogen-air mixtures in configurations representative of scramjet combustors was made. The correlation was examined in light of.

If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive. Ignition, flame structure and near-wall burning in transverse hydrogen jets in supersonic crossflowCited by: (8) Huber, P.W., et al., Criteria for Self-Ignition of Supersonic Hydrogen-Air Mixtures, NASA TP, ().

(9) Arai, T., et al., Experiments of Pre-Mixed Shock-Induced Combustion Scramjet with Forebody-Wall Fuel Injection, AIAA (AIAA/AAAF 11th Int. Space Planes and Hypersonic Systems and Technology Conference), (). Criteria for self-ignition of supersonic hydrogen-air mixtures. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type: Government publication, National government publication.

Methane-Hydrogen-Air Mixtures PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de Rector Magnificus, C.J.

van Duijn, voor een commissie aangewezen door het College voor Promoties in het openbaar te verdedigenCited by: Numerical Investigation of Hydrogen-Air Mixtures Ignition near Lean Flammability Limit M.F. Ivanov, A.D. Kiverin, A.E. Smygalina Joint Institute for High Temperatures of the Russian Academy of Sciences Abstract The 0D and 1D aproaches for lean flammability limit determination are presented for hydrogen-air mixture.

Results,Author: M. Ivanov, A. Kiverin, A. Smygalina. Open Library is an open, editable library catalog, building towards a web page for every book ever published. •We still do not know in detail in which case hydrogen auto-ignites. High Pressure Hydrogen Combustion Example •High pressure hydrogen was mixed with air and detonates.

The original mixture pressure was assumed to be MPa and the pipe received a combustion pressure (most probably detonation) of Size: KB. Transient simulation of the hydrogen-assisted self-ignition of propane-air mixtures under ambient condition were carried out in platinum-coated micro-combustors, using a two-dimensional model with reducedorder reaction schemes, heat conduction in the solid walls, convection and surface radiation heat transfer.

The selfignition behavior of the hydrogen-propane mixed fuel is Cited by: 1. A hypersonic gas laser to produce coherent infra-red electromagnetic radiation for use in communication, illumination, energy transmission or weather control. The lasing device uses an interaction area consisting of a grid of fine wires or the like to convert the kinetic energy of hypersonic velocity gases to vibrationally excited nitrogen from which the laser energy is Cited by: 4.Characteristics of a Hydrogen-Argon Plasma Torch for Supersonic Combustion Applications,” AIAA Journal of Propulsion and Power, Vol.

5, No. 2, pp.3. Barbi, Eric, “Uncooled Choked Plasma Torch for Ignition and Flameholding in Supersonic Combustion,” Masters Thesis, Virginia Polytechnic Institute & [email protected]{osti_, title = {Detonation of hydrogen-air mixtures.

[PWR; BWR]}, author = {Lee, J H.S. and Knystautas, R and Benedick, W B}, abstractNote = {The detonation of a hydrogen-air cloud subsequent to an accidental release of hydrogen into ambient surroundings cannot be totally ruled out in view of the relative sensitivity of the hydrogen-air system.