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The obstacle configuration in the first channel (blockage ratio 0.3, 0.6, and no obstacles), exit cross section to the canyon (1.4, 2, and 5.6 m2), and vent area at the end (0, 2.5, and 4 m2) were varied in the tests.
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Tests were performed with several obstacle configurations.
Three obstacle configurations with different cross-wise positions are investigated.
The method was tested by computer simulations for various obstacle configurations and densities.
Further computational experiments using large number of edges and diverse obstacle configurations reminiscent of outdoor environments are in our agenda.
Furthermore, identifying the avoidance maneuver is extended to consider all nearby obstacle points and generate an avoidance rule applicable for all obstacle configurations.
For Regime 1 and staggered obstacle configurations, we observe resonance phenomena that significantly reduce the DDT time when S/2 is comparable to the channel width.
For three obstacle configurations, the merged jet flames, paralleling jet flames, and separated jet flames are observed after twin jet flames are formed downstream of the two slits.
The results indicate that the flame propagation for all obstacle configurations in a closed duct can be divided into four typical stages, i.e. hemispherical flame, finger-shaped flame, jet flame and bidirectional propagation flame.
Experiments with hydrogen air and ethylene air mixtures at atmospheric pressure were carried out in a 6.1 m long, 0.1 m diameter tube with different obstacle configurations and ignition types.
The work includes validation against experiments conducted in a variety of configurations including: (1) closed pipes with obstacles; (2) other congested lab-scale geometries; (3) medium to large-scale 3-D obstacle configurations; and (4) large-scale geometries where DDT occurred upon flame propagation from confined to more open configurations.
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