Topic
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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TL;DR: In this paper, a free-falling steel projectile impacts the top of an air/water mixture in a polycarbonate tube, and stress waves in the tube material and pressure on the tube wall are measured.
Abstract: Shock propagation through a bubbly liquid contained in a deformable tube is considered. Quasi-one-dimensional mixture-averaged flow equations that include fluid–structure interaction are formulated. The steady shock relations are derived and the nonlinear effect due to the gas-phase compressibility is examined. Experiments
are conducted in which a free-falling steel projectile impacts the top of an air/water mixture in a polycarbonate tube, and stress waves in the tube material and pressure
on the tube wall are measured. The experimental data indicate that the linear theory is incapable of properly predicting the propagation speeds of finite-amplitude waves
in a mixture-filled tube; the shock theory is found to more accurately estimate the measured wave speeds.
34 citations
TL;DR: In this article, a database for simulation of state-resolved dissociation processes is presented, where rate coefficients valid up to very high temperatures have been obtained for diatom-diatom collisions, using the forced harmonic oscillator theory.
Abstract: Physical-chemical processes encountered behind atmospheric entry shock waves are known to occur in extremely nonequilibrium conditions. Also, translational temperatures up to 100,000 K may be reached immediately behind the shock wave. Such challenging conditions require the development of adequate state-to-state models, which prevents using widespread first-order theories. A complete database for the simulation of state-resolved dissociation processes is presented in this paper. Rate coefficients valid up to very high temperatures have been obtained for diatom-diatom collisions, using the forced harmonic oscillator theory. The rate coefficients for atom-diatom collisions have been selected after a critical review of the existing data sets, as the forced harmonic oscillator theory proved inadequate for the simulation of such processes. Such a consistent state-to-state model has then been used for simulating nitrogen dissociation processes behind very high-temperature shock waves, and the obtained results have been compared with those obtained using popular one- and two-temperature models.
34 citations
TL;DR: In this paper, the results of two experiments with identical granular media but with and without filtration were compared, based on this comparison quantitative information on the gas fil-tration and its role in the stress formation inside granular medium of different material and length was obtained.
34 citations
TL;DR: In this paper, the authors focused on determining whether pipe diameter was a major factor that could limit the applicability of frictionless models such as GASDECOM, and found that the effect of the slower decompression speed on arrest toughness was then evaluated by a comparison involving several hypothetical pipeline designs.
34 citations
TL;DR: Turbulence measurements have been made in the incident and reflected flows of a shock tube as mentioned in this paper, where hot wire anemometers have been used to measure mass flux and total temperature fluctuations.
Abstract: Turbulence measurements have been made in the incident and reflected flows of a shock tube. For the incident flow, M = 0.47 and Re/in. between 25,000 and 170,000 whereas in the reflected region M = 0.15 and Re/in. is between 12,000 and 85,000. Hot wire anemometers have been used to measure mass flux and total temperature fluctuations. In the incident flow mass flux and total temperatures averaged 1.2 percent and 0.5 percent respectively. The reflected shock amplified the turbulence intensities by approximately a factor of three. In general the intensities decreased with increasing flow Reynolds numbers.
34 citations