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High Pressure Ignition of Boron in Reduced Oxygen Atmospheres

Published online by Cambridge University Press:  10 February 2011

R. O. Foelsche ,
M. J. Spalding ,
R. L. Burton  and
H. Krier
R. O. Foelsche
Affiliation:
University of Illinois, Urbana, IL 61801 Dept. of Aeronautical and Astronautical Engineering
M. J. Spalding
Affiliation:
University of Illinois, Urbana, IL 61801 Dept. of Mechanical and Industrial Engineering
R. L. Burton
Affiliation:
University of Illinois, Urbana, IL 61801 Dept. of Aeronautical and Astronautical Engineering
H. Krier
Affiliation:
University of Illinois, Urbana, IL 61801 Dept. of Mechanical and Industrial Engineering
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Abstract

Boron ignition delay times for 24 μm diameter particles have been measured behind the reflected shock at a shock tube endwall in reduced oxygen atmospheres and in a combustion bomb at higher pressures in the products of a hydrogen/oxygen/nitrogen reaction. The shock tube study independently varies temperature (1400 – 3200 K), pressure (8.5, 34 atm), and ignition-enhancer additives (water vapor, fluorine compounds). A combustion chamber is used at a peak pressure of 157 atm and temperature in excess of 2800 K to study ignition delays at higher pressures than are possible in the shock tube.

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