Wilhelm  Jost  Institut Förderverein e.V.

Flame Speed


The laminar flame speed is the speed, where fresh gas with flame formations of movements flows under  laminar conditions towards the flame front. The flame front of laminar flames on burners is stationary, with turbulent flames, as they occur in most technical burn procedures, the flame front fluctuates around a middle situation. The flame speed of the turbulent flame amounts to a multiple of the speed of the laminar flame.


Testing Method:

  • Container procedure:

          The flame moves through the resting gaseous fuel mixture, whereby the laminar flame speed is computed from the migration of the flame front.

  • Burner procedure:

          The flame and the fresh gas mixture flow against the flame front.


Safety-relevant meaning::


Within the ignition limits of an inflammable mixture the flame speed is the suitable size for the description of the flame propagatoin.