Dynamic characteristics of spherically converging detonation waves |
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Authors: | Zonglin Jiang Lina Chang Fan Zhang |
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Affiliation: | (1) Key Laboratory of High Temperature Gas Dynamics, Chinese Academy of Sciences, Institute of Mechanics, 15 Zhong Guan Cun Road, Beijing, 100080, China;(2) Defence Research and Development Canada—Suffield, P.O. Box 4000, Stn. Main, Medicine Hat, AB T1A 8K6, Canada |
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Abstract: | The spherically converging detonation wave was numerically investigated by solving the one-dimensional multi-component Euler equations in spherical coordinates with a dispersion-controlled dissipative scheme. Finite rate and detailed chemical reaction models were used and numerical solutions were obtained for both a spherical by converging detonation in a stoichiometric hydrogen-oxygen mixture and a spherically focusing shock in air. The results showed that the post-shock pressure approximately arises to the same amplitude in vicinity of the focal point for the two cases, but the post-shock temperature level mainly depends on chemical reactions and molecular dissociations of a gas mixture. While the chemical reaction heat plays an important role in the early stage of detonation wave propagation, gas dissociations dramatically affect the post-shock flow states near the focal point. The maximum pressure and temperature, non-dimensionalized by their initial value, are approximately scaled to the propagation radius over the initial detonation diameter. The post-shock pressure is proportional to the initial pressure of the detonable mixture, and the post-shock temperature is also increased with the initial pressure, but in a much lower rate than that of the post-shock pressure. Zonglin Jiang is presently a visiting professor at McGill University, Canada. |
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Keywords: | Spherically converging detonation Spherical shock wave Gas dissociation Chemical reaction Numerical simulation |
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