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Wednesday, December 2, 2020 | History

1 edition of Experimental investigations of shock waves undergoing sudden expansion in a confined chamber found in the catalog.

Experimental investigations of shock waves undergoing sudden expansion in a confined chamber

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  • 37 Currently reading

Published .
Written in English

    Subjects:
  • Fluid dynamics,
  • Blast effect

  • Edition Notes

    Statementby Gregg Lawrence Abate
    The Physical Object
    Paginationxvi, 187 leaves :
    Number of Pages187
    ID Numbers
    Open LibraryOL25913921M
    OCLC/WorldCa43702770

    The effects of channel tortuosity will be discussed Figure The expansion of spherical and cylindrical shock waves from the strong-shock region into the weak- shock region. The radii of both spherical and cylindrical geometries have been nondimensionalized using the relaxation radii defined in . BOOKS "The Scramjet Engine: Processes and Characteristics", C. Segal, Cambridge University Press, Cambridge, United Kingdom, ISBN , pages BOOK CHAPTERS.   Shock Tubes and Waves: Proceedings of the Thirteenth International Symposium on Shock Tubes and Waves [Treanor, Charles E., Hall, J. Gordon] on *FREE* shipping on qualifying offers. Shock Tubes and Waves: Proceedings of the Thirteenth International Symposium on Shock Tubes and WavesAuthor: Charles E. Treanor, J. Gordon Hall.


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Experimental investigations of shock waves undergoing sudden expansion in a confined chamber by Gregg Lawrence Abate Download PDF EPUB FB2

Time-accurate flowfield visualization data in the form of a circular cut-off Schlieren imagery of the shock waves undergoing the sudden area expansion in air have been gathered and studied at Mach numbers of, and The information was collected from a square shock tube with sudden expansion in one by: 2.

This article reviews recent experimental and computational data of the dynamics of a fast, transient shock wave undergoing a sudden expansion within a confined chamber. Issues related to shock speed and location, gas dynamic structure, and vorticity and dissipation rate production are elucidated via direct assessment of the existing by:   In this study, an experimental study was conducted on shock waves generated by high-pressure gas release through a tube.

And most attention was given to the main characteristics of shock wave generated in different downstream tubes with various release pressures, including shock strength, structure and by: This banner text can have markup.

web; books; video; audio; software; images; Toggle navigation. Explosions in confined spaces lead to complicated patterns of shock wave reflection and interactions which are best investigated by use of experimental tests or numerical simulations.

In 14 self contained chapters this 9 th volume of the “Shock Wave Science and Technology Reference Library” presents the experimental methods used in Shock Tubes, Shock Tunnels and Expansion Tubes facilities.

Also described is their set-up and operation. The uses of an arc heated wind tunnel and a gun tunnel are also contained in this volume. The influence of a variation of the opening ratios of rooms and side walls on the propagation of a shock wave within a confined multi-chamber system is analyzed through the evolution of some of the shock parameters (maximum overpressure and positive impulse).

The shock wave is generated by the detonation of a hemispherical gaseous charge in one of the rooms. an expansion with 1 > p2 p1 > 0 and 1 waves, termed shock waves, may exist in reality.

To prove this point, one may use thermodynamic arguments based on the second principle, which indicates that, in an. The present study involves the shock wave and consequent vortex loop generated when a shock tube with various nozzle geometries is employed. It aims to provide quantitative and qualitative insight into the physics of these compressible phenomena.

The geometries included two elliptic nozzles with minor to major axis ratios of anda 15 mm circular nozzle and a 30×30 mm2 square nozzle.

Abstract This work reports the experimental characterization of detonation initiation modes in a confined chamber in respect to the different types of reacting waves generated in various small-diameter ignition tubes.

The present phase of the research focuses on the dependence of the shock wave attenuation on a double barrier configuration, while keeping the opening ratio fixed at The methodology is a numerical approach that has been validated by experimental results.

The experiments were conducted in a shock tube using a high-speed camera. In this study, the problem of a planar blast wave in a duct with a sudden expansion is considered. An incident blast wave that contains two shock waves is arranged so that one pair of vortex rings.

A shock wave is a surface of discontinuity propagating in a gas at which density and velocity experience abrupt changes. One can imagine two types of shock waves: (positive) compression shocks which propagate into the direction where the density of the gas is a minimum, and (negative) rarefaction waves which propagate into the direction of maximum density.

Underwater shock waves have been the subject of many theoretical and experimental studies in the past 25 years. This increased interest has been motivated by the success of the techniques developed to use shock waves for the noninvasive treatment of nephrolithiasis, known as extracorporeal shock wave lithotripsy (ESWL 1).

In regard to the rate of dissipation of turbulent kinetic energy (TKE) for a two-dimensional planar shock undergoing a sudden expansion within a confined chamber, calculations show that the.

This process is experimental and the keywords may be updated as the learning algorithm improves. This is Numerical investigation of inviscid shock wave dynamics in an expansion tube.

Shock Waves 5, () Dynamic structure of confined shocks undergoing sudden expansion. Progress in Aerospace Scien () Google Scholar. Abstract. The behavior of a shock wave generated by a hemispherical gaseous charge and propagating within a confined multi-chamber system is analyzed through the evolution of some of the shock parameters (maximum overpressure and positive impulse).

The increase in temperature causes a different distribution at energy levels and this implies a change in the characteristics of the emission spectrum. L2K test chamber and TALIF experimental set-up. The inset shows a close-up sketch of the detection system. Paganucci F and d'Agostino L Experimental investigation of shock-wave.

Recent investigations involving shock waves generation and shock pressure measurement in direct ablation regime and confined ablation regime for aluminium, copper, titanium and steel (40C) materials are reported.

Experimental measurements demonstrated that in direct ablation regime the peak pressures typically are less than 10 $^{9}$ Pa when the incident laser intensity is about 10. The methods of Lagrangian analysis are explored as applied to the measurements of time-resolved stress and particle-velocity waves.

The basic analysis methods are introduced. Heuristic examples provide understandings into the use of the shock analysis tools. Further insights are provided through applications to relevant experimental shock-wave.

The 24th International Symposium on Shock Waves (ISSW24) was held at the Beijing Friendship Hotel during July, in Beijing.

It was a great pleasure for the Local Organizing Committee to organize the ISSW in China for the first time, because forty-seven years have passed since the First Shock Tube Symposium was held in at Albuquerque. Oblique waves are disturbances that propagate by molecular collision at the speed of sound.

Oblique waves may eventually coalesce and form oblique shocks or spread out to form an expansion wave. The formation of Mach waves is described. The Mach wave angle is. An axisymetric model of a shock tube with a 3 gram charge of Primasheetsimilar to the experimental configuration, was first attempted.

Results demonstrated a direct dependence between the shape and placement of the explosive charge and the simulated pressure at the exit of the shock tube. Analytical investigations have developed mathematical models to describe the shape of the various shock waves and the point of intersection between the incident wave and the reflected wave [5,6,7,8,9,10,11,12].An interesting experiment was performed by Skews [] in order to determine the reflected expansion shock profile and the angle it forms with the surface in a multi-facetted wall.

Wedge "a" generates a shock wave with the conditions downstream of this shock noted as zone "1". The flow in zone "1" is parallel to wedge "a" and the conditions are specified by the oblique shock relations given on another page.

Wedge "b" also generates a shock wave with the conditions downstream of this shock noted as zone "2". Understanding the causes and effects of explosions is important to experts in a broad range of disciplines, including the military, industrial and environmental research, aeronautic engineering, and applied mathematics.

Offering an introductory review of historic research, Shock Waves and Explosions brings analytic and computational methods. Shock wave, strong pressure wave in any elastic medium such as air, water, or a solid substance, produced by supersonic aircraft, explosions, lightning, or other phenomena that create violent changes in waves differ from sound waves in that the wave front, in which compression takes place, is a region of sudden and violent change in stress, density, and temperature.

The shock wave that formed on the wing is now at the trailing edge. When the wing is tilted upward, a shock wave forms below its leading edge, and an expansion wave forms above its leading edge. The higher pressure behind the shock wave and lower pressure behind the expansion wave result in a single force that pushes the wing up and back.

Shock waves are generated. Shock waves are very small regions in the gas where the gas properties change by a large amount. Across a shock wave, the static pressure, temperature, and gas density increases almost instantaneously.

Because a shock wave does no work, and there is no heat addition, the total enthalpy and the total temperature are. “Breakup of Droplets under Shock Impact”, C.

Segal, A., Chandy and D. Mikolaitis, in Advances in Confined Detonations, (G. Roy, S. Frolov, R.J. Santoro, S.A. Tsyganov, editors), Torus Press, Moscow, Russia, ISBNpp.Moscow, The results of the experimental research on the symmetry of supersonic flow in a symmetric convergent-divergent nozzle are presented.

The investigations were focused on the fact that for some flow conditions the flow in a precisely symmetric nozzle becomes asymmetric. Starting from a specific value of Mach number, the flow becomes asymmetric in terms of shock wave λ-foot geometry on. Confined explosions represent a serious safety hazard as significant damage to humans and structures is observed, unlike in free-field explosions.

An experimental small-scale study investigated the blast wave in a single-story building. The blast waves were generated by the detonation of a gaseous charge.

The building was divided into two rooms by a movable wall which could be. The efficiency by which the kinetic energy of a shock wave is converted into the thermal energy of the gas is of basic importance in astrophysics in connection with the heating of stellar atmospheres(1,2, 3) similar problems arise also in re-entry of space vehicles.' 4' In order to examine such problems, it is necessary tcf study the shock.

Shock Waves in Condensed Matter, Proceedings by S. Schmidt (Author), N. Holmes (Editor) See all formats and editions Hide other formats and editions. Price New from Used from Hardcover "Please retry" $ $ $ Hardcover $Author: S.

Schmidt. These observations highlight that the shock front was behaving in line with previous experimental results of sudden shock wave expansion, further validated by the theory. Using the relationship in Eq 4, the Mach number of the shock wave as it exits the shock tube can be used to predict the angle of propagation of the critical shock, predicting.

The investigations of shock-wave phenomena in condensed matter that are discussed in this book are stimulated by the necessity to develop methods for predicting effects of explosions, high-velocity collisions, and other sources of intense dynamic loading of materials and structures.

Shock waves 45 § Introduction to the gasdynamics of shock waves 45 § Hugoniot curves 49 § Shock waves in a perfect gas with constant specific heats 50 § Geometric interpretation of the laws governing compression shocks. 5 § Impossibility of rarefaction shock waves in a fluid with normal thermodynamic properties 59 § The nature and analysis of shock and large amplitude wave propagation in condensed matter is undertaken in this chapter.

The consequences of impact or any intense-energy loading, including change of state, failure, extent of crush, fragmentation, or any of a number of physical, mechanical or chemical changes are dependent on details of the local transport of energy and momentum.

When a shock wave reaches an observer a "sonic boom" is heard. [insert N-wave discussion] Unlike ordinary sound waves, the speed of a shock wave varies with its amplitude. The speed of a shock wave is always greater than the speed of sound in the fluid and decreases as the amplitude of the wave decreases.

When the shock wave speed equals the. In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium.

Like an ordinary wave, a shock wave carries energy and can propagate through a medium but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium. Experimental Investigation of Supersonic Flame Stabilisation based on Fuel Self‐Ignition Experimental Investigation of Supersonic Flame Stabilisation based on Fuel Self‐Ignition Gruenig, C.; Mayinger, F.

1 Introduction One option to propel a hypersonic flight system is the supersonic combustion ramjet (scramjet) [1±3].An Investigation of the Shock Structures and Conditions for Jetting during Liquid Impact.- Computer Simulation of the Effect of Free Surface Reflection on Shock Wave Propagation in Water.- The Calculation of Dimensions of the Steady Mach Wave.- Spherical Shocks in Solids.- The Attenuation of Shock Waves in PU Foam and Its ApplicationUnderstanding the causes and effects of explosions is important to experts in a broad range of disciplines, including the military, industrial and environmental research, aeronautic engineering, and applied mathematics.

Offering an introductory review of historic research, Shock Waves and Explosions brings analytic and computational methods Reviews: 1.