Self-ignition, flame and detonation in gases

by A. S. Sokolik

Publisher: Israel Program for Scientific Translations in Jerusalem

Written in English
Published: Pages: 458 Downloads: 486
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Edition Notes

Originally published: Moskva: Izdatelstvo Akademii Nauk SSSR, 1960.

StatementA.S. Sokolik.
The Physical Object
Paginationvi,458p.
Number of Pages458
ID Numbers
Open LibraryOL13953333M

Combustion (burning) is a process by which energy is released. Deflagration and detonation are two ways energy may be released. If the combustion process propagates outward at subsonic speeds (slower than the speed of sound), it's a deflagration. If the explosion moves outward at supersonic speeds (faster than the speed of sound), it's a detonation. Detonation (from Latin detonare, meaning 'to thunder down/forth') is a type of combustion involving a supersonic exothermic front accelerating through a medium that eventually drives a shock front propagating directly in front of it. Detonations occur in both conventional solid and liquid explosives, as well as in reactive gases. The velocity of detonation in solid and liquid . Detonation Characteristics of Hydrogen- Oxygen Mixtures MORTON P. MOYLE, RICHARD B. MORRISON, and STUART W. CHURCHILL The University of Michigan, Ann Arbor, Michigan Detonation velocities were measured in mixtures of hydrogen and oxygen containing 25 to Flame ignition. The flame ignition was an early attempt at producing an internal combustion engine. It is not the same as a flame licker, which uses vacuum to create power. Flame ignition engines suck a fuel/air mixture into the combustion chamber through a .

The combustion of a gas mixture (flame, explosion, detonation) is necessarily accompanied by motion of the gas. The process of combustion is therefore not only a chemical phenomenon but also one of gas dynamics. The material selection focuses on the gas phase and with premixed gas combustion.   * Self-ignition temperature is the temperature required for the fuel to automatically ignite without the help of external sources like spark plugs or igniter coils. * In petrol engines, spark plug is used to ignite the fuel. Whereas in diesel eng. The gas burns with a clear flame. The gas generator supplies gas at - k PA (40 to 60 psi). The flame contains hydrogen and oxygen and no other elements. The end product after burning = water (only H20). The gas burns through a variety of noz zle sizes and presently can have a flame length of up to mm. INTERACTIVE COMBUSTION EFFECT. Books; Show More; Type. Electric Soldering Iron Kit (24) Items (24) 1 product rating - Gas Self Ignition Plumbing Turbo Torch Propane Soldering Brazing Welding Tool US. $ or Best Offer Mini Gas Self Ignition Flame Gun Torch Soldering Propane Welding Plumbing Tool. Brand New. $ or Best Offer +$ shipping.

  The flame travels across the combustion chamber igniting the Air/Fuel Mixture. This causes a steady increase in cylinder pressure and forces the piston down on the Power Stroke. When detonation happens, some of the air/fuel . Applications. The phenomenon is exploited in pulse detonation engines, because a detonation produces a more efficient combustion of the reactants than a deflagration does, i.e. giving a higher engines typically employ a Shchelkin spiral in the combustion chamber to facilitate the deflagration to detonation transition.. The mechanism has also found military use .   Deflagration combustion: A deflagration is characterized by a subsonic flame propagation velocity, typically far below metres per second ( mph), and relatively modest overpressures, say below bars ( psi). The main mechanism of combus. A pulse detonation engine (PDE) is a type of propulsion system that uses detonation waves to combust the fuel and oxidizer mixture. The engine is pulsed because the mixture must be renewed in the combustion chamber between each detonation wave and the next. Theoretically, a PDE can operate from subsonic up to a hypersonic flight speed of roughly Mach 5. An ideal .

Self-ignition, flame and detonation in gases by A. S. Sokolik Download PDF EPUB FB2

Self-ignition, flame and detonation in gases Unknown Binding – January 1, by A. S Sokolik (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback "Please retry" $ — $ Author: A.

S Sokolik. Self-ignition, Flame and Detonation in Gases [A S Sokolik] on *FREE* shipping on qualifying offers. Self-ignition, Flame and Detonation in Gases: A S Sokolik: : Books.

Self-ignition, flame and detonation in gases. Jerusalem: Israel Program for Scientific Translation: [Available from the Office of Technical Services, U.S. Dept. of Commerce, Washington], (OCoLC) Document Type: Book: All Authors /. The book then takes a look at detonation waves in gases; emission spectra, ionization, and electric-field effects in flames; and methods of flame photography and pressure recording.

The publication is a valuable reference for readers interested in combustion Edition: 2. Combustion Waves in Turbulent Flow.

Air Entrainment and Burning of Jets and Fuel Gases. Detonation Waves in Gases. Emission Spectra, Ionization, and Electric Field Effects in Flames. Methods of Flame Photography and Pressure Recording. State of the Burned Gas Temperature, Pressure, and Volume of the Burned Gas.

Temperature and Radiation of the Burned : Bernard, Guenther. Combustion, Flames, and Explosions of Gases. Combustion, Flames and Explosions of Gases, Third Edition provides the chemist, physicist, and engineer with the scientific basis for understanding combustion phenomena.

This book introduces the detonation phenomenon in explosives. It is ideal for These permit detonation speed, gas properties ahead and behind the detonation wave, and the distribution of fluid properties within the detonation wave itself to be determined. Subsequent chapters de- Flame Acceleration Mechanisms   This greater rate of flame travel causes a pressure wave that collides with the initial flame front and combustion space surfaces, creating an audible sound ("knock") associated with : Jim Mcfarland.

Sokolik, A S Self-ignition, Flame and Detonation in Gases. Here short description of cool flame, blue flame and hot ignition. You need to see something like this: "low temperature ignition". — 4 Ihe self— ignit ion in a shock vrave initiating the detonation occurs at the distance of 64 millimeters from the flame front, Prom the point of view of Bone this distance is the maximum v/ithin vjhich '^the radiation from the flame front, absorbed by the compressed gas in the shock wave, may lead to stich rise in the temperature and.

Book review Full text access Self-ignition, flame and detonation in gases: A. Sokolik, Moscow, Translated from Russian by N. Kaner and edited by R. Hardin. Israel Program for Scientific Translations: Jerusalem, vi+ pp. 96s. Introduction 2.

Structure of detonation wave Stationary zone of chemical reaction Rarefaction wave The Chapman-Jouguet condition DivergiCited by: 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. The analysis performed shows that multistage self-ignition under known conditions can display the reason for strong shock and detonation wave generation.

The wave excitation mechanism is associated with flame self-acceleration as, during the transition of combustion into detonation in tubes Author: Paul Clavin.

Get this from a library. Self-ignition, flame and detonation in gases. (Samovosplamenenie, plamya i detonatsiya v gazakh). [A S Sokolik]. Abstract. Molecules of H 2 O 2 and H 2 O are detected in gas phase in deuterium—oxygen flame by their near IR emission spectra in the reactor, which surface was previously treated with atomic hydrogen.

It was shown that both the formation of these compounds and the observed decrease in the lower limit of spontaneous ignition of D 2 + O 2 Author: Nikolai M.

Rubtsov. Abstract. The fundamental principles of gas combustion are examined in a comprehensive introduction for chemists, physicists, and engineers. Topics addressed include the chemistry and kinetics of H/sub 2/-O/sub 2/, CO-O/sub 2/, and hydrocarbon-O/sub 2/ reactions; combustion waves in laminar and turbulent flow; air entrainment and the burning of gaseous-fuel jets; and detonation waves in gases.

Detonation is the uncontrolled self-ignition of gases in the cylinder. What’s so serious about a little self-ignition. Simply this: those gases burn with an explosive intensity that hammers pistons and melts parts.

During normal combustion, the spark plug ignites a flame front that moves smoothly across the cylinder. Introduction to Physics and Chemistry of Combustion: Explosion, Flame, Detonation Michael A.

Liberman (auth.) Most of the material covered in this book deals with the fundamentals of chemistry and physics of key processes and fundamental mechanisms for various combustion and combustion-related phenomena in gaseous combustible mixture. factors affecting detonation in SI engine,factors affecting knocking in SI engine,auto ignition temperature,knocking,detonation,flame speed,flame travel distance,engine size,turbulence,self.

It provides the reader with basic knowledge of burning processes and mechanisms of reaction wave propagation. The combustion of a gas mixture (flame, explosion, detonation) is necessarily accompanied by motion of the gas. The process of combustion is therefore not only a chemical phenomenon but also one of gas dynamics.

The flame acceleration and the physical mechanism underlying the deflagration-to-detonation transition (DDT) have been studied experimentally, theoretically, and using a two-dimensional gasdynamic model for a hydrogen-oxygen gas mixture by taking into account the chain chemical reaction kinetics for eight components.

A flame accelerating in a tube is shown Cited by: Full text of "DTIC ADA Ignition, Combustion, Detonation, and Quenching of Reactive other formats AFOSR founctartion lOHITIOlt, OOMUSnON, DETONATION, AND QUENCHHIB OF REACTIVE MIXTURES AIR FORCE OmCE OF SCIBITIFIC RESEARCH BoUlxkg Air Fore* Base Wa«hlngtcm, D.

Apirored for public. AUTO IGINITION A mixture of fuel and air can react spontaneously and produce heat by chemical reaction in the absence of flame to initiate the combustion or self-ignition.

This type of self- ignition in the absence of flame is known as Auto-Ignition. The temperature at which the self-ignition takes place is known as self- igniting temperature. to natural gas, the ability of hydrogen to initiate a detonation or to tran-sition from a deflagration to a detonation (deflagration-detonation-transition, DDT) is more likely.

On the other hand, even though hydrogen has a greater propensity to leak than other gaseous flammables (Table 2), it has been argued that.

Stabilized burning is the even, steady burning of a flame, stabilized at or close to the flame arrester element. A distinction is made between short time burning (stabilized burning for a specific period of time) and endurance burning (stabilized burning for an unlimited period of time) (Fig.

Detonation is an explosion propagating at supersonic. detonation. * Detonation. Propagation of a combustion zone at a velocity that is greater than the speed of sound in the unreacted medium. A A detonation is a coupled combustion-shock wave complex that moves together with a wave speed that is supersonic, between 5 and 10 times the sound speed in the unburned gas ahead of the flame.

Transition from combustion to detonation in gases Gas dynamic scheme of formation of detonation in a tube Calculation of the state of the mixture ahead of the flame front Compression wave and adiabatic self-ignition Interaction of flame with shock wave 6.

Oscillations of gas behind the detonation front Cited by: Typical detonation velocities in gases range from m/s to m/s. Typical velocities in solid explosives often range beyond m/s to m/s. VoD can be measured by using the Dautriche method. General - the time lag between the initiation of two ends of, a length of detonating fuse.

4. Flame Acceleration and Detonation in Tubes.- Experimental observations of detonation onset in tubes.- The breakup of an arbitrary discontinuity in a fuel mixture.- Propagation of a flame from the closed end of a tube. Production of compression waves.- Why a flame develops into a detonation wave.

Shchelkin's explanation.-Author: Grigory Isaakovich Barenblatt. of gas heated to the self—ignition tem~erature. If, for example, the combustible mixture is heated to the self– ignition tcxnperature by adiabatic on, tilen, as olserved by Dickson (reference 5) who photographed the process of the-flame developmeilt on a film moving in a di-rection perpendicular to the axis of the homi)), self-File Size: 2MB.Most detonation flame arrester applications are in systems which collect gases emitted by liquids and solids.

These systems, commonly used in many industries, may be called vapor control systems. The gases which are vented to atmosphere or controlled via vapor control systems are typically flammable. [PDF] Introduction to Physics and Chemistry of Combustion: Explosion, Flame, Detonation Popular.