If the cylinder contents were at rest this bubblewould be unbroken, but with the air turbulencenormally present within the cylinder, the filamentof flame is broken up into a ragged front, whichincreases its area and greatly increases the speedof advance. While the rate of advance depends onthe degree of turbulence, the direction is littleaffected, unless some definite swirl is imposed onthe system. The combustion can be considered intwo stages.
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