The formation of shock waves from the combustion of gaseous mixtures with special consideration of the sodium-air reaction

This paper reports on the design and performance of a large diameter diaphragmless shock tube that has been recently developed in order to experimentally study various basic characteristics of the gas-dynamic laser (GDL). The main engineering element of the shock tube is a diaphragm-like sliding piston (in place of a rupturing diaphragm) by which normal shock waves are formed. The role of such a structure in generating repeatable shock waves is discussed. The shock tube performs in good accordance with the simple shock tube theory, as has been verified so far by experiments with some conventional lasing gases (gaseous mixtures of CO2 and N2 and those diluted with an excess of He) at shock wave Mach numbers ranging from 1 to 5. Recent results of the stagnation conditions achieved in the shock tube with application to GDL experiments are included as well.

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Measurements of Velocity in the Turbulent Stage of Gaseous Mixtures Induced by Shock Waves

Fluid Mechanics and Its Applications - IUTAM Symposium on Variable Density Low-Speed Turbulent Flows ◽

10.1007/978-94-011-5474-1_35 ◽

1997 ◽

pp. 273-276

Author(s):

F. Poggi ◽

M. H. Thorembey ◽

G. Rodriguez ◽

J. F. Haas

Keyword(s):

Shock Waves ◽

Gaseous Mixtures

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Structure of planar shock waves in gaseous mixtures based on ab initio direct simulation

European Journal of Mechanics - B/Fluids ◽

10.1016/j.euromechflu.2018.05.014 ◽

2018 ◽

Vol 72 ◽

pp. 251-263 ◽

Cited By ~ 2

Author(s):

Felix Sharipov ◽

Fernanda C. Dias

Keyword(s):

Shock Waves ◽

Ab Initio ◽

Direct Simulation ◽

Gaseous Mixtures ◽

Planar Shock

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Investigation of shock-wave deformation history from recovered structure

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100143754 ◽

1986 ◽

Vol 44 ◽

pp. 434-435

Author(s):

M.A. Mogilevsky ◽

L.S. Bushnev

Keyword(s):

Shock Wave ◽

Plastic Deformation ◽

Dislocation Density ◽

Shock Waves ◽

Shock Front ◽

Single Crystals ◽

Residual Deformation ◽

Deformation Structure ◽

Deformation History ◽

Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

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