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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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TL;DR: In this paper, the authors reported the experimental discovery of a second shock forming ahead of a radiative shock propagating in Xe and N2, and the formation radius of the second shock as a function of Xe mass fraction is consistent with an analytical estimate.
Abstract: We have previously reported the experimental discovery of a second shock forming ahead of a radiative shock propagating in Xe. The initial shock is spherical, radiative, with a high Mach number, and it sends a supersonic radiative heat wave far ahead of itself. The heat wave rapidly slows to a transonic regime and when its Mach number drops to two with respect to the downstream plasma, the heat wave drives a second shock ahead of itself to satisfy mass and momentum conservation in the heat wave reference frame. We now show experimental data from a range of mixtures of Xe and N2, gradually changing the properties of the initial shock and the environment into which the shock moves and radiates (the radiative conductivity and the heat capacity). We have successfully observed second shock formation over the entire range from 100% Xe mass fraction to 100% N2. The formation radius of the second shock as a function of Xe mass fraction is consistent with an analytical estimate.
30 citations
TL;DR: In this article, a spray environment for injection of liquid fuel sprays into hot air at 1.0, 2.14, and 4.0 MPa was used to characterize relative fuel reactivity, the dependence of reactivity on temperature and pressure, and allow for correlation of reactionivity under spray and homogenous gas phase conditions.
29 citations
TL;DR: A test series in the Electric Arc Shock Tube at NASA Ames Research Center with the objective of quantifying shock-layer radiative heating magnitudes for future probe entries in... is described in this paper.
Abstract: This paper describes a test series in the Electric Arc Shock Tube at NASA Ames Research Center with the objective of quantifying shock-layer radiative heating magnitudes for future probe entries in...
29 citations
TL;DR: The National Institute of Standards and Technology is developing a primary standard for the measurement of dynamic pressure and temperature as discussed by the authors, which requires a dynamic source and a technique for calibrating it.
Abstract: The National Institute of Standards and Technology is developing a primary standard for the measurement of dynamic pressure and temperature. Our method requires a dynamic source and a technique for calibrating it. The source is a shock tube; the calibration technique is based on the properties of diatomic gas molecules measured by laser spectroscopic methods.
29 citations
TL;DR: In this paper, the steady-state jump equations for a normal ionizing shock wave propagating into a nonconducting, quiescent gas in an electromagnetic field were obtained. But the authors did not consider the effects of the upstream electromagnetic field.
Abstract: Solutions to the steady‐state jump equations are obtained for a normal ionizing shock wave propagating into a nonconducting, quiescent gas in an electromagnetic field. Comparison of these solutions to pure magnetohydrodynamic shocks and ordinary gas shocks indicates that ionizing shocks are hybrids having some properties common to both magnetohydrodynamic and gas shocks. Some completely novel effects are produced by the upstream electromagnetic field. The shock velocities are bounded for a given upstream electric field strength where the electric field is assumed parallel to the shock plane. For electric fields larger than a critical value, Ec, no steady compressive shocks exist, and for nonzero electric fields ``switch‐on'' behavior is extended to slow shocks. Solutions analogous to detonation‐deflagration waves have been found, and the Chapman‐Jouguet condition is applied to them. The complete boundary value problem is solved in the context of an electromagnetic annular shock tube to place the analytic ...
29 citations