Flame speeds and combustion characteristics of undiluted and nitrogen-diluted hydrogen-nitrous oxide mixtures
2011
会议
Seventh Joint US Sections Meeting of the Combustion Institute
In the present study, some explosive properties of undiluted and nitrogen diluted H2-N2O mixtures were characterized. Laminar flame speeds and the explosion-induced pressure rises were determined experimentally for a range of mixture equivalence ratios (φ = 0.15-1.0), dilutions (0-55% N2), and initial pressures (20-80 kPa). The measured flame speeds were used to validate laminar flame speed computations using a detailed chemical kinetic mechanism. The results demonstrate that hydrogen-nitrous oxide mixtures exhibit laminar flame speeds as large as 350 cm/s and pressure rise coefficients (Kg) as large as 35 MPa m/s. Also, flames in lean mixtures are shown to be highly unstable which can lead to flame acceleration and possible deflagration-to-detonation transition.
