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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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Journal ArticleDOI
TL;DR: In this paper, the effects of pseudo-perforated walls on the attenuation of weak shock waves generated in high speed train tunnels were studied in a 1/250-scaled train tunnel simulator.
Abstract: In order to attenuate weak shock waves in ducts, effects of pseudo-perforated walls were investigated. Pseudo-perforated walls are defined as wall perforations having a closed cavity behind it. Shock wave diffraction and reflection created by these perforations were visualized in a shock tube by using holographic interferometer, and also by numerical simulation. Along the pseudo-perforated wall, an incident shock wave attenuates and eventually turns into a sound wave. Due to complex interactions of the incident shock wave with the perforations, the overpressure behind it becomes non-uniform and its peak value can locally exceed that behind the undisturbed incident shock wave. However, its pressure gradient monotonically decreases with the shock wave propagation. Effects of these pseudo-perforated walls on the attenuation of weak shock waves generated in high speed train tunnels were studied in a 1/250-scaled train tunnel simulator. It is concluded that in order to achieve a practically effective suppression of the tunnel sonic boom the length of the pseudo-perforation section should be sufficiently long.

43 citations

Journal ArticleDOI
01 Jan 2009
TL;DR: In this article, a high-temperature ethylene reaction mechanism was investigated behind reflected shock waves in a shock tube of 76mm in diameter, where experiments were performed within the temperature range of 1060-1520 k, pressures of 5.9-16.5 k, and stoichiometries of ϕ ǫ = 0.5, 1.0 and 2.0.
Abstract: Oxidation of ethylene/air mixtures has been investigated behind reflected shock waves in a shock tube of 76 mm in diameter. Experiments were performed within the temperature range of 1060–1520 K, pressures of 5.9–16.5 atm, and stoichiometries of ϕ = 0.5, 1.0, and 2.0. Emissions of OH (308.9 nm), CH (431.5 nm) and C 2 (516.5 nm) molecules, pressures and ion current records were implemented to measure ignition times of the mixture along the centreline of the tube and in the boundary layer. Empirical correlations for ethylene ignition times have been deduced from the experimental data. Auto-ignition modes (strong, transient and weak) and ignition limits of the mixtures were identified comparing velocities of reflected shock wave and reaction front at different locations from the reflecting wall. Extensive database for validations of high-temperature ethylene reaction mechanism and numerical methods for reaction flow simulations has been obtained from experimental observations.

43 citations

Journal ArticleDOI
TL;DR: In this article, a high-speed imaging setup was utilized to visualize the shock tube cross-section through a transparent quartz end-wall, and the results suggest that premature ignition events are more likely to happen in mixtures containing higher ethanol concentration and that preignition energy release is more pronounced at lower temperatures.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the design and performance of a new pulse-expansion wave tube for nucleation studies at high pressures are described, which is a special shock tube in which a nucleation pulse is formed at the endwall of the high pressure section.
Abstract: The design and performance of a new pulse-expansion wave tube for nucleation studies at high pressures are described. The pulse-expansion wave tube is a special shock tube in which a nucleation pulse is formed at the endwall of the high pressure section. The nucleation pulse is due to reflections of the initial shock wave at a local widening situated in the low pressure section at a short distance from the diaphragm. The nucleation pulse has a duration of the order of 200 μs, while nucleation pressures that can be achieved range from 1 to 50 bar total pressure. Droplet size and droplet number density can accurately be determined by a 90°-Mie light scattering method and a light extinction method. The range of nucleation rates that can be measured is 108 cm-3 s-1

43 citations

Journal ArticleDOI
TL;DR: In this article, wave propagation in a water-saturated porous column consisting of fixed sand particles is studied by means of a shock tube technique, and pore pressures and axial strains are recorded simultaneously.
Abstract: Wave propagation in a water‐saturated porous column consisting of fixed sand particles is studied by means of a shock tube technique. Pore pressures and axial strains are recorded simultaneously. The measurements show a coincident compression of pore fluid and porous column during the passage of the first wave. Due to the second wave the pore fluid is compressed while the porous material expands. This observed behavior is in agreement with theoretical predictions. The introduction of a frequency‐dependent permeability and an effective pore radius based on a cylindrical duct model yields an improved description of the damping of the second wave.

43 citations


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