High-pressure hydrogen/carbon monoxide syngas turbulent burning velocities measured at constant turbulent Reynolds numbers

Using a double-chamber explosion facility, we measure high-pressure turbulent burning velocities (S-T) of lean syngas (35%H-2/65%CO) spherical flames at constant turbulent Reynolds numbers (Re-T equivalent to u'L-I/nu) varying from 6700 to 14,200, where the root-mean-square turbulent fluctuation velocity (u') and the integral length scale (L-I) are adjusted in proportion to the decreasing kinematic viscosity of reactants (nu) at elevated pressure ( p) up to 1.2 MPa. Results show that, contrary to popular scenario for turbulent flames, at constant Re-T, S-T decreases similarly as laminar burning velocities (S-L) with increasing p in minus exponential manners. Moreover, at constant p, S-T/S-L increases noticeably with increasing Re-T. It is found that the present very scattering S-T/S-L data at different p and Re-T can be nicely merged onto a relation of S-T/u' = 0.49Da(0.25), where Da is the turbulent Damkohler number and values of S-T/u' tends to level-off when Da > 160 and p > 0.7 MPa. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.