Influence of Multiple Factors on the Explosion Characteristics of Flammable Gases in Municipal Sewage Pipelines

Figure 8

Flame propagation structure under different ignition positions: (a) top ignition 0.21 s; (b) top ignition 0.23 s; (c) center ignition 0.185 s; (d) center ignition 0.205 s; (e) bottom ignition 0.13 s; (f) bottom ignition 0.18 s.

(a)

(b)

(c)

(d)

(e)

(f)