@article{oai:tsukuba.repo.nii.ac.jp:00027889,
 author = {笠原, 次郎 and Yamashita, Hiroki and Kasahara, Jiro and Sugiyama, Yuta and Matsuo, Akiko},
 issue = {9},
 journal = {Combustion and flame},
 month = {Sep},
 note = {This study was a numerical and experimental investigation of low-temperature auto-ignitions behind
reflected shock waves in which a shock tube was employed as the experimental system. We used a
high-speed video camera and the Schlieren method to visualize the ignition phenomena. Experiments
were performed over a temperature range from 549 ± 10 to 1349 ± 11 K and a pressure range from
56 ± 2 to 203 ± 13 kPa, and a non-diluted stoichiometric acetylene–oxygen mixture was chosen as the
combustible gas. We introduced a numerical simulation to help us understand the disturbed temperature
distribution behind bifurcated shock waves due to interference between reflected shock waves and the
boundary layer developed behind incident shock waves. Additionally, we experimentally observed and
evaluated quantitatively a tendency for ignition positions to be located farther from the reflecting wall
as the temperature decreased behind reflected shock waves. To focus our attention on the ignition positions,
we classified the ignition types behind reflected shock waves as near-wall ignition and far-wall
ignition by 4.7 mm distance from reflecting wall. The criterion for these ignition types was estimated
to be -1.0≦(∂ti/∂T5t)p5t≦-0.5. As a main object in this manuscript, we proposed an ignition model
in which local ignition is induced at some distance from reflecting wall based on the numerical simulation
and results; the local ignitions at a point distant from the reflecting wall are induced by the temperature
rise, with the distance from the reflecting wall, immediately behind concave reflected shock waves
due to developing of bifurcated shock waves. We confirmed that there is no discrepancy between the proposed
model and experimental results.},
 pages = {2954--2966},
 title = {Visualization study of ignition modes behind bifurcated-reflected shock waves},
 volume = {159},
 year = {2012}
}