Computations of High Enthalpy Shock-waves in Electric Arc Shock-Tube (EAST) at NASA Ames

2018 ◽  
Author(s):  
Durgesh Chandel ◽  
Ioannis Nompelis ◽  
Graham V. Candler
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Electric Arc ◽  
High Enthalpy

Generation of Cylindrical Converging Shock Waves in a Conventional Shock Tube

2015 ◽  
pp. 1077-1082 ◽  
Author(s):  
L. Biamino ◽  
G. Jourdan ◽  
C. Mariani ◽  
L. Houas ◽  
M. Vandenboomgaerde ◽  
...  
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Converging Shock Waves

Effects of Shock-Tube Cleanliness on Slender-Body Hypersonic Instability and Transition Studies at High-Enthalpy

2015 ◽  
Author(s):  
Nick J. Parziale ◽  
Joseph S. Jewell ◽  
Ivett A. Leyva ◽  
Joseph Shepherd ◽  
Hans Hornung
Keyword(s):  
Shock Tube ◽  
Slender Body ◽  
High Enthalpy ◽  
Transition Studies

Shock-initiated exothermic reactions. VI. The oxidation of ethylene oxide and cyclopropane

1969 ◽  
Vol 22 (7) ◽  
pp. 1355 ◽  
Author(s):  
LJ Drummond ◽  
J Kikkert
Keyword(s):  
Shock Waves ◽  
Ethylene Oxide ◽  
Shock Tube ◽  
Induction Period ◽  
Ignition Delay ◽  
Exothermic Reactions ◽  
Induction Periods ◽  
Reflected Shock ◽  
Formaldehyde Oxidation ◽  
Temperature Dependences

Mixtures of ethylene oxide or cyclopropane with oxygen and argon were ignited with reflected shock waves In a shock tube. The temperature dependences of the ignition delay and the growth of light emitted during the induction period to explosion of C2H4O-O2 mixtures indicate that the rate-controlling reaction is that of formaldehyde oxidation. The temperature dependence of induction periods for C3H6-O2 mixtures suggests that a complicated but undetermined mechanism controls the delay to ignition.

Analysis of Shock Deceleration Effects on Radiation Experiments in the NASA Electric Arc Shock Tube

2022 ◽  
Author(s):  
Peter L. Collen ◽  
Matthew Satchell ◽  
Luca di Mare ◽  
Matthew McGilvray
Keyword(s):  
Shock Tube ◽  
Electric Arc

scholarly journals Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

2020 ◽  
Vol 10 (12) ◽  
pp. 4128
Author(s):  
Mahesh Thorat ◽  
Shiba Sahu ◽  
Viren Menezes ◽  
Amol Gokhale ◽  
Hamid Hosano
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Shock Loading ◽  
Pressure Rise ◽  
Incident Shock ◽  
Foam Density ◽  
Aluminum Foams ◽  
Closed Cell ◽  
Rigid Walls ◽  
End Wall

It is important to protect assets located within cavities vulnerable to incident shock waves generated by explosions. The aim of the present work is to explore if closed cell aluminum foams can mediate and attenuate incident shocks experienced by cavities. A small cavity of 9 mm diameter and 2 mm length was created within the steel end-wall of a shock tube and exposed to shocks, directly or after isolating by aluminum foam liners. Shock waves with incident pressure of 9–10 bar travelling at a velocity of 1000–1050 m/s were generated in the shock tube. Compared to the no-foam condition, the pressure induced in the cavity was either equal or lower, depending on whether the foam density was low (0.28 g/cc) or high (0.31 to 0.49 g/cc), respectively. Moreover, the rate of pressure rise, which was very high without and with the low density foam barrier, reduced substantially with increasing foam density. Foams deformed plastically under shock loading, with the extent of deformation decreasing with increasing foam density. Some interesting responses such as perforation of cell walls in the front side and densification in the far side of the foam were observed by a combination of scanning electron microscopy and X-ray microscopy. The present work conclusively shows that shocks in cavities within rigid walls can be attenuated by using foam liners of sufficiently high densities, which resist densification and extrusion into the cavities. Even such relatively high-density foams would be much lighter than fully dense materials capable of protecting cavities from shocks.

Qualification of the European Shock-Tube for High Enthalpy Research

2020 ◽  
Author(s):  
Mario Lino Da Silva ◽  
Ricardo Ferreira ◽  
Rafael Rodrigues ◽  
Luis Alves ◽  
Bruno Gonçalves ◽  
...  
Keyword(s):  
Shock Tube ◽  
High Enthalpy

scholarly journals A Shock Tube Study on Nonequilibrium Radiation of Strong Shock Waves in Low-Density Air.

1998 ◽  
Vol 41 (2) ◽  
pp. 390-396 ◽  
Author(s):  
Hiroki HONMA ◽  
Toshihiro MORIOKA ◽  
Nariaki SAKURAI ◽  
Kazuo MAENO
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Strong Shock ◽  
Low Density ◽  
Nonequilibrium Radiation ◽  
Strong Shock Waves ◽  
Tube Study

Observations of Shock Waves in an Electrically Driven Shock Tube

1964 ◽  
Vol 7 (6) ◽  
pp. 906 ◽  
Author(s):  
H. G. Ahlstrom ◽  
D. W. Mahaffey ◽  
L. Sanga ◽  
R. I. Schoen
Keyword(s):  
Shock Waves ◽  
Shock Tube
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