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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Effects of Local Flame Displacement Velocity on Turbulent Burning Velocity for Stoichiometric Hydrogen-Oxygen-Dilution Gas Mixtures

Get access (open in a dialog) DOI: 10.1615/IHTC15.cmb.008589
pages 1181-1192

摘要

The present study is experimentally performed to establish a prediction method of turbulent burning velocity for stoichiometric hydrogen-oxygen-dilution mixtures, paying special attention to the importance of local burning velocity to turbulent burning velocity, where Ar and CO2 in addition to N2 as a conventional dilution were adopted. In this study, stoichiometric mixtures with different dilution ratios, whose laminar burning velocity SL0 was varied from 25 to 90 cm/s, were also used under almost the same weak turbulence condition, so that the ratio of turbulence intensity u’ to SL0 becomes 0.4 to 2.0. A two-dimensional sequential laser tomography technique was applied to obtain the relationship between a flame shape and a flame movement in a constant-volume vessel. The local flame displacement velocity SF of turbulent flames was quantitatively measured as a key parameter of local burning velocity. It was found that the trends of the mean values of SF, SF,m, against u’/SL0 corresponded well to its turbulent burning velocities; however, regardless of dilution types SF,m did not increase infinitely with increasing u’/SL0. An attempt was also made to predict the turbulent burning velocity using some empirical equations. As a result, the predicted turbulent burning velocities, where the obtained SF,m was employed instead of SL0 as the local burning velocity, were in good agreement with the experimental findings.