Shock tube

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

Experimental and modeling study of shock‐tube oxidation of acetylene

Abstract: Nine mixtures of acetylene and oxygen diluted in argon were studied behind reflected shock waves at temperatures of 1150–2132 K and pressures of 0.9–1.9 atm. Initial compositions were varied from very fuel-lean to moderately fuel-rich, covering equivalence ratios of 0.0625–1.66. Two more mixtures with added ethylene were used to boost the sensitivity to reactions of vinyl oxidation. The progress of reaction was monitored by laser absorption of CO molecules. The collected experimental data were subjected to extensive detailed chemical kinetics analysis. The initial kinetic model was assembled based on recent literature data and then optimized using the solution mapping technique. The analysis was extended to include recent experimental observations of Hidaka and co-workers (Combust Flame 1996, 107, 401). The derived model reproduces closely both sets of experimental data, the result obtained by modifying nine rate coefficients and three enthalpies of formation of intermediate species. The identified parameter tradeoffs and justification for the changes are discussed. © 2003 Wiley Periodicals, Inc. Int J Chem Kinet 35: 391–414, 2003

The numerical simulation of shock bifurcation near the end wall of a shock tube

Abstract: The reflection of a normal shock wave from the end wall of a two‐dimensional channel has been numerically simulated to investigate the unsteady, viscous interaction aspects of shock bifurcation. The numerical simulation implements a data‐parallel version of the Flux‐Corrected Transport algorithm that has been coupled to the viscous transport terms of the Navier–Stokes equations. All numerical simulations were performed on the Connection Machine, the CM‐5. The results indicate that the shear layer in the bifurcation zone is unstable, and the large and small scale vortices lead to complex flow patterns. In addition, the high‐speed, essentially inviscid flow, which is adjacent to the shear layer, is deflected over this region. As a result, weak shock and expansions waves are generated and a reattachment shock is formed at the trailing edge of the interaction region. The impact of heat transfer, Reynolds number, and incident shock strength on the viscous interaction is also investigated. Heat transfer to the ...

Shock-Tube Study of the Termal Dissociation of Nitrogen

Abstract: The dissociation of nitrogen behind shock waves has been studied over a temperature range of 6000 to 10 000°K. A time‐resolved Mach‐Zehnder interferometer measured the density profiles in the reaction zone. Rate expressions based on classical collision theory and the hydrodynamic constraint equations were used to fit the experimental profiles. Inferred rate constants are presented with N2, N, Ne, and Ar as third bodies. This work differs from previous studies of nitrogen in that a measurement of the forward dissociation rate was made in N2 with N2 as the third body and in that the new data indicates that N is about as effective a third body as N2. Vibrational relaxation data indicates that to a first approximation there is no significant coupling between vibrational relaxation and dissociation over the temperature range covered. Vibrational relaxation times in N2‐Ne mixtures behind combustion driven shocks indicate that Ne is about 1.4 times as effective as N2 in vibrationally exciting N2, agreeing well with predictions of the Landau theory. This agreement between theory and experiment is just as good as that obtained for Ar utilizing pressure breaks, vindicating the combustion technique.