Effective flame speeds of turbulent free flames were measured by photographic, ionization gap, and photohyphen;multiplier tube methods; they were found to have a statistical distribution attributed to the random nature of the turbulent field. The effective turbulent flame speeds for the free flame were found to be less than those previously measured for flames seated on Bunsen burners and bluff bodies. The statistical spread of the effective turbulent flame speeds was markedly wider in the lean and rich fuelhyphen;air regions. This is attributed to the greater sensitivity of laminar flame speed to flame temperature in the lean and rich regions.
展开▼
