Ignition and combustion of boron particles in hydrogen/oxygen explosion products

R. O. Foelsche, R. L. Burton, H. Krier

Research output: Contribution to conferencePaperpeer-review


The ignition and combustion of boron particles is investigated at high pressures and temperatures produced by the explosive reaction (unsteady fast deflagration) of nitrogen-diluted hydrogen/oxygen mixtures. A novel device is described with which particles are injected after sufficient delay for combustion and gas phase transients to equilibrate, and are ignited at high temperature and nearly constant pressure conditions. Using this technique, the ignition and combustion times of 24 micron crystalline boron particles are measured over a range of pressures (37.5, 76, 150 atm), temperatures (2630, 2820 K), and at two excess O2 concentrations (10, 20%). Although boron has been observed elsewhere to exhibit a two-stage ignition process at lower pressures and temperatures, only a single stage is observed here. Boron particle ignition delays are reduced with increased pressure and decreased particle size. Measured results are compared to predictions from two ignition models. The expected effects of ignition-enhancing agents, e.g., HF, SF6, CO2, are discussed.

Original languageEnglish (US)
StatePublished - 1997
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997


Other35th Aerospace Sciences Meeting and Exhibit, 1997
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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