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Shock tube

About: Shock tube is a research topic. Over the lifetime, 6963 publications have been published within this topic receiving 99372 citations.


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31 Jul 1966
TL;DR: In this article, a narrow electron beam was used to selectively determine the component densities in rarefied helium-argon flows by spectrally analyzing the beam's luminescence, and point-by-point measurements were made along and off the axes of underexpanded free jets and through normal shock waves produced by shock holders placed in the jets.
Abstract: : A narrow electron beam was used to selectively determine the component densities in rarefied helium-argon flows by spectrally analyzing the beam's luminescence After a systematic study of the electron beam fluorescence in helium and argon was made in a series of preliminary experiments, point-by- point measurements were made along and off the axes of underexpanded free jets and through normal shock waves produced by shock holders placed in the jets Various argon mole fractions were used, and the jet Reynolds number ranged from 100 to 10,000 The argon enrichment found along the jet axis agrees well with a theory recently proposed by F S Sherman Off axis tests show an argon deficiency near the jet boundary The experimental shock profiles agree only qualitatively with one-dimensional theories Radial diffusion destroyed the otherwise approximate one-dimensionality of the shock waves, resulting in a significant argon enrichment inside the partially stagnated shock holder (Author)

60 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that the negative temperature coefficient derived from the shock wave measurements is greater than the value derived from comparison of the average high temperature result with the room temperature result for any particular gas.
Abstract: The rate of the dissociation reaction, M+I2[open phi] lim kRkDM+I+I, has been measured by the shock tube method for argon, helium, nitrogen, oxygen, and carbon dioxide as inert gases, M, in the temperature range 1000°—1600°K. The shock wave results by themselves and the comparison of the shock wave measurements with the room temperature measurements of kR by flash photolysis both show that kR has a negative temperature coefficient. The absolute value of this negative temperature coefficient derived from the shock wave measurements is greater than the value derived from comparison of the average high temperature result with the room temperature result for any particular gas. This may be due to experimental error in the determination of dkR/dT at the high temperatures, but it is believed that the values of kR determined in the middle of the temperature range studied are reliable.The experimental evidence indicates that, for the measurements with CO2, the rate of vibrational equilibration is so fast that the...

60 citations

Journal ArticleDOI
01 Jan 2009
TL;DR: In this article, a direct numerical simulation based on compressible flow dynamics has been applied to the autoignition and extinction of a high-pressure hydrogen jet spouting from a tube.
Abstract: In this study, a direct numerical simulation based on compressible flow dynamics has been applied to the autoignition and extinction of a high-pressure hydrogen jet spouting from a tube. The diameter of the tube is 4.8 mm. The length of the tube is 71 mm. At the inlet, pressure is set at 3.6, 5.3 and 21.1 MPa, and temperature is set at 300 K for all cases. To explore the autoignition of hydrogen jet, two-dimensional axisymmetric Navier–Stokes equations with a detailed chemical kinetics and rigorous transport properties have been employed. The hydrogen jet through the tube is choked. The numerical results show that the high-pressure hydrogen jet produces a semi-spherical shock wave in the ambient air at the early time of jetting. The shock wave heats up the air to a high temperature and causes the autoignition of the hydrogen and air mixture in the tube as well as at the tube exit.

60 citations

Journal ArticleDOI
TL;DR: In this article, a single spinning detonation wave propagating in a circular tube, discovered experimentally in 1926, is simulated three-dimensionalally with a detailed chemical reaction mechanism, where the detonation front numerically rotates periodically with a Mach leg, whiskers, and a transverse detonation.

60 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023148
2022285
2021134
2020175
2019173
2018159