Science and Technology of Energetic Materials

Vol.63, No.2 (2002)

Research paper

The third body effect and the second explosion limit of hydrogen(*in Japanese)
Yoshiro Nagumo, Catherina Dewi Wijaya, Chihiro Fushimi, and Mitsuo Koshi


Ignition delay times of H2/O2 mixtures diluted in Ar have been measured behind reflected shock waves with the addition of 02, N2, H2O and CO2 near the second explosion limit.simulations of hydrogen combustion have been performed using a detailed chemical kinetic model, which is composed of 28 elementary reactions. Sensitivity coefficients of each elementary reaction for the ignition delay were calculated. The rate of the reaction of H + 02 + M = HO2 + M is most sensitive to the ignition delay time near the second explosion limit. The effect of additives could attribute to the third body effect in the H + 02 + M reaction. The rate constants for this reaction with various third bodies could be determined by fitting simulation results to the experimental ignition delay times. It is found that the third body efficiencies for H20 and CO2 are much larger than others. These third body effects are extremely important to control ignition and explosion characteristic of hydrogen combustion.

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