The first part of the present work is to validate a detailed kinetic mechanism for the oxidation of hydrogen–methane–air mixtures in detonation waves. A series of experiments on auto-ignition delay times have
been performed by shock tu
be technique coupled with emission spectrometry for H
2/CH
4/O
2 mixtures highly diluted in argon. The CH
4/H
2 ratio was varied from 0 to 4 and the equivalence ratio from 0.4 to 1. The temperature range was from 1250 to 2000 K and the pressure
behind reflected shock waves was
between 0.15 and 1.6 MPa. A correlation was proposed
between temperature (K), concentration of chemical species (mol
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml58&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=4a918196f947e96c7a8fa37522a46d09" title="Click to view the MathML source">m-3) and ignition delay times. The experimental auto-ignition delay times were compared to the modelled ones using four different mechanisms from the literature: GRI [Smith PG, Golden DM, Frenkl
ach M, Moriarty NW, Golden
berg M, et al.
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml59&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=7dd374b3a5f153b9a05534d6d50c9fe5" title="Click to view the MathML source">
acket" border=0>http://www.me.
berkeley.edu/gri_mech/
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml60&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=e1d91967062549a2c57f5e8071cc25a9" title="Click to view the MathML source">
acket" border=0>], Marinov et al. [Aromatic and polycyclic aromatic hydrocarbon formation in a laminar premixed
n-butane flame. Combust Flame 1998; 114:192–213], Hughes et al. [
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml61&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=e7e1b969ff2903fe10063e970b970b2b" title="Click to view the MathML source">
acket" border=0>http://www.chem.leeds.
ac.uk/Combustion/Combustion.html
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml62&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=230ca1edbc41ff084766e7ec661bbeab" title="Click to view the MathML source">
acket" border=0>], Konnov [Detailed re
action mechanism for small hydrocarbons combustion. Release 0.5
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml63&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=dddad8faee32e70285bd4023a2b47886" title="Click to view the MathML source">
acket" border=0>http://homepages.
vub.
ac.
be/
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml64&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=ea9e7a4fea20cb7533aeef90dd29e059" title="Click to view the MathML source">![not, vert, similar](http://www.sciencedirect.com/scidirimg/entities/223c.gif)
akonnov/
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml65&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=45ce9b76167379dd495317d42f937433" title="Click to view the MathML source">
acket" border=0>, 2000]. A large discrepancy was generally found
between the different models. Konnov's model, which auto-ignition delay times predictions were the closest to the measured ones, has
been selected to calculate ignition delay times in the detonation waves. The second part of the study concerned the experimental determination of the detonation properties, namely detonation velocity and cell size. Effect of the initial composition, hydrogen to methane ratio and the amount of oxygen in the mixture, as well as the initial pressure on the detonation velocity and on the cell size were investigated. The ratio of methane/(methane
ack" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4PC90FH-1&_mathId=mml66&_user=10&_cdi=5729&_rdoc=16&_acct=C000050221&_version=1&_userid=10&md5=30ef70f9142b315c321e8a7e411d159e" title="Click to view the MathML source">+ hydrogen) varied
between 0 and 0.6 for two different equivalence ratios (0.75 and 1) while the initial pressure was fixed to 10 kPa. A correlation was established
between the char
acteristic cell size and the ignition delay time
behind the leading shock of the detonation. It was clearly shown that methane has an important inhibitor effect on the detonation of these combustible mixtures.