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Thursday, July 30, 2020 | History

4 edition of On the effectiveness of various modes of detonation or combustion found in the catalog.

On the effectiveness of various modes of detonation or combustion

by Charles DePrima

  • 361 Want to read
  • 33 Currently reading

Published by Courant Institute of Mathematical Sciences, New York University in New York .
Written in English


Edition Notes

Statement(by Charles DePrima and Anneli Leopold).
ContributionsLeopold, Anneli
The Physical Object
Pagination51 p.
Number of Pages51
ID Numbers
Open LibraryOL17982929M

This mode of combustion is less efficient than detonation (produces less energy per amount of fuel), but much easier to control. The upper CJ point is referred to as detonation. This mode is much less used compared to the first. It is generally only used for military or mining reasons. Continuous Detonation Engine One of the current interests in the hypersonic propulsion system is the detonation engines which offer significant advantage in cycle efficiency. Past development in detonation engines has mainly focused on pulsed detonation engines (PDE), where intermittent 1-D combustion across a shock propagating in a tube is.

The next quite a few chapters deal in considerable component with completely totally different factors and mechanisms of the initiation of detonation, and its quantitative description. The second half of this amount focuses upon combustion. In depth analysis model ignition and combustion, with functions to completely totally different propellants. Although the detonation combustion mode produces the most severe damage, fast deflagrations of the cloud can result from flame acceleration under .

  The precise difference is the mechanism by which the reaction is propagated. Specifically, detonation is a reaction that is propagated by shock (a shock wave), and a combustion reaction is thermally propagated. In either of these reaction types, y. Combustion is a fascinating phenomenon coupling complex chemistry to transport mechanisms and nonlinear fluid dynamics. This book provides an up-to-date and comprehensive presentation of the nonlinear dynamics of combustion waves and other non-equilibrium energetic by:


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On the effectiveness of various modes of detonation or combustion by Charles DePrima Download PDF EPUB FB2

This banner text can have markup. web; books; video; audio; software; images; Toggle navigation. Depending on various conditions, an explosive medium may support either a deflagration or a detonation wave. There are two modes of initiation in detonation phenomena: a slower mode, sometimes called thermal initiation, in which there is transition from deflagration; a fast mode brought about by an ignition blast or strong shock wave.

Low explosives (like black powder) rely on combustion to generate energy. Combustion Combustion is produced by the reaction of oxygen and some sort of fuel at high temperatures. As a result, the rate of a combustion reaction is limited both by the amount of fuel present and the amount of oxygen it comes in contact with.

The modes of gaseous combustion. The book is aimed at the analysis of contemporary problems in combustion science, namely flame propagation, detonation, and heterophaseous combustion based on the works of the author; from a certain viewpoint, it.

Such combustion situations may lead to different autoignition modes from constant-volume scenarios. Using one-dimensional direct numerical simulations with detailed chemistry and transport of H 2 /air mixture, the autoignition modes during knocking combustion were studied under different engine combustion boundary by: 3.

The presence of ethanol tends to reduce the formation and emission of soot particles in most combustion modes. The effect of ethanol content on soot reduction becomes saturated when ethanol concentration reaches 15%, irrespective of the combustion modes.

The basic problems of application of detonation process in propulsion systems with impulse and continuous burning of combustible mixture are discussed.

The results on propagation of detonation waves in supersonic flow are analyzed relatively to air-breathing engine. The experimental results are presented showing the basic possibility of creation of an engine with exterior detonation Cited by: 4.

Effective, theoretical calculations of the detonation parameters and the chemical equilibrium composition of reaction products based on physical and chemical properties of an energetic material, as its atomic composition, enthalpy.

Detonation — generally caused by fuel with a low octane rating — is the tendency for the fuel to pre-ignite or auto-ignite in an engine's combustion chamber. This early (before the spark plug fires) ignition of fuel creates a shock wave throughout the cylinder as the burning and expanding fuel-air mixture collides with the piston that is still traveling towards top-dead.

Detonation is identified as any spontaneous combustion occurring after the burn process has already begun, and is independent of the initial flame front. This uncontrolled event can originate from anywhere within the chamber and is usually caused by. In the present paper, detailed review of various experimental studies and computational analysis addressing the detonation mode of combustion in pulse detonation engines are discussed.

The effect of different parameters on the improvement of propulsion performance of pulse detonation engine has been presented in detail in this research by: This book introduces the detonation phenomenon in explosives.

It is ideal for The important effects of confinement and boundary conditions and their influence on the propagation of a detonation are also discussed.

The final chapters cover the various ways deto- His research areas are in combustion, detonations and shock wave physics. The next several chapters deal in considerable detail with different aspects and mechanisms of the initiation of detonation, and its quantitative description.

The second half of this volume focuses upon combustion. Extensive studies model ignition and combustion, with applications to different propellants. Based on comparison of relative rates of turbulent combustion and detonation of various substances, a uniform method for the calculation of the rates of deflagration and detonation is suggested.

In the case of detonation, correction factors arise in the formula of dependence for the rate of combustion, which take into account the increase of pressure and Cited by: 2. Detonation Research.

Everyone probably recall using a lens to concentrate the sun light and burn gly, radiation in a cylinder acts quite like a gas and as the compression increases, the density of photons increases (like with the lens), and similarly the associated electric field which is ultimately responsible for sparks, combustion and 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.

Instability, extinction and re-initiation of rotating detonation in a two-dimensional Rotating Detonation Engine (RDE) configuration are numerically investigated, and the emphasis is laid on the effects of variable total pressures on the above combustion dynamics. Two conditions, i.e. different constant pressures and time-varying pressures, are considered to investigate the combustion Cited by: 4.

A number of factors can have an effect on the performance of a pulsed detonation engine (PDE), detonation initiation, combustion wave speed, detonator wall temperature and the homogeneity of the.

regimes of the combustion propagation. This review focuses solely on explaining various phenomena of premixed combustion: (1) flame propagation, (2) detonation waves, (3) when and how explosions occur, (4) the transition from flame to detonation and (5) when ignition of combustion involves phases of deflagration or detonation.

COMBUSTION IN S I & C I ENGINES 1. COMBUSTION IN S.I & C.I ENGINES 2. Combustion may be defined as a relatively rapid chemical combination of hydrogen and carbon in fuel with oxygen in air resulting in liberation of energy in the form of heat.

Following conditions are necessary for combustion to take place 1. This book focuses on the latest developments in detonation engines for aerospace propulsion, with a focus on the rotating detonation engine (RDE). State-of-the-art research contributions are collected from international leading researchers devoted to the pursuit of controllable detonations for practical detonation propulsion.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 Author: Chian Yan, Hong Hui Teng, Xiao Cheng Mi, Hoi Dick Ng.Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle.

The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive.