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<p>The balance of shock propagation and energy release in the detonation diffraction represents one of the most complex and unresolved phenomena relevant to gaseous detonations. Herein, the effects of nitrogen, argon, and helium diluent concentrations on the diffraction behavior of stoichiometric hydrogen-oxygen-diluent detonations at initial pressures of 0.5 and 1.0&#xa0;bar are investigated. Through experimental analysis utilizing high-speed Schlieren and direct photography techniques, distinct diffraction outcomes were observed for different diluent compositions: increased argon and helium diluent concentrations led to supercritical transmission and affect the diffraction structure. The present study also identifies the detonation Damköhler number, defined as the ratio of the characteristic flow timescale to chemical timescale, as a diffraction outcome predictor. It is shown that detonations with diffraction Damköhler numbers exceeding 160 and 110 for initial pressures of 1.0 and 0.5&#xa0;bar, respectively, will super-critically diffract.</p>

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Detonation Diffraction and its Dependence on the Damköhler Number

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Jacob Klein,
  • Omid Samimi-Abianeh

摘要

The balance of shock propagation and energy release in the detonation diffraction represents one of the most complex and unresolved phenomena relevant to gaseous detonations. Herein, the effects of nitrogen, argon, and helium diluent concentrations on the diffraction behavior of stoichiometric hydrogen-oxygen-diluent detonations at initial pressures of 0.5 and 1.0 bar are investigated. Through experimental analysis utilizing high-speed Schlieren and direct photography techniques, distinct diffraction outcomes were observed for different diluent compositions: increased argon and helium diluent concentrations led to supercritical transmission and affect the diffraction structure. The present study also identifies the detonation Damköhler number, defined as the ratio of the characteristic flow timescale to chemical timescale, as a diffraction outcome predictor. It is shown that detonations with diffraction Damköhler numbers exceeding 160 and 110 for initial pressures of 1.0 and 0.5 bar, respectively, will super-critically diffract.