ID#: 12
Abstract Title: On Accuracy of the Turbulent Burning Velocity Measured in a Cruciform Burner using Ion-Probe Sensors
Session Title: Premixed Turbulent Flames II
Session Date: 7/30/01
Session Start Time: 11:20 AM
Contributing Author: Shy, S.S.
Organization: National Central University
Country: Taiwan R.O.C
Authors: W.J. Lin, R.C. Su, S.S. Shy
Short Abstract: We have measured turbulent burning velocities of methane-air and propane-air mixtures over a wide range of equivalence ratios and turbulent intensities (u'/SL) up to 50 using a pair of ion-probe sensors. These results were compared with other experimental data using different burners and they can be fitted into a general correlation of the form (ST-SL)/u'=0.05 Da^0.61, where Da is the Damkohler number. This correlation is found to be better than previous correlations, which covers both corrugated flamelet (large Da) and distributed (small Da) regimes. However, some questions remain to be answered. Do the ion-probe sensors actually measure the turbulent burning velocity (not the turbulent flame speed)? In other words, can the gas velocities ahead of propagating turbulent flames be neglected? What are the effects of pressure rise due to turbulent burning in the cruciform burner on ST measurements? This work addresses these questions and validates the accuracy of our ST measurements using two ion-probe sensors.