TY - JOUR
T1 - Determination of laminar flame speeds using digital particle image velocimetry
T2 - 30th International Symposium on Combustion
AU - Hirasawa, T.
AU - Sung, C. J.
AU - Joshi, A.
AU - Yang, Z.
AU - Wang, H.
AU - Law, Chung King
N1 - Funding Information:
The work at CWRU was supported by the National Science Foundation under the technical monitoring of Dr. Farley Fisher. The work at UD and PU was sponsored by the AFOSR under the technical monitoring of Dr. J. M. Tishkoff.
PY - 2002
Y1 - 2002
N2 - The atmospheric laminar flame speeds of mixtures of air with ethylene, n-butane, toluene, ethylene-nbutane, ethylene-toluene, and n-butane-toluene were experimentally and computationally investigatedover an extended range of equivalence ratios. Binary fuel blends with 1:1, 1:2, and 2:1 molar ratios were examined. Experimentally, the laminar flame speeds were determined using digital particle image velocimetry (DPIV). Since the use of DPIV enables the mapping of the two-dimensional flow field ahead of the flame, the reference speed based on the minimum axial velocity point as well as the imposed strain rate can be identified simultaneously. The latter can now be unambiguously determined by the radial velocity gradient at the minimum velocity point. By systematically varying the imposed strain rate, the corresponding laminar flame speed was obtained through nonlinear extrapolation to zero strain rate. The associated experimental accuracy of the DPIV measurements was also assessed and discussed. Computationally, the laminar flame speeds were simulated for all single-component fuel/air and binary fuel blend/air mixtures with a detailed kinetic model. Comparison of experimental and computed flame speeds shows generally good agreement. A semiempirical mixing rule was developed. The mixing rule, which requires only the knowledge of the flame speeds and flame temperatures of the individual fuel constituents, is shown to provide accurate estimates for the laminar flame speeds of binary fuel blends under the conditions tested.
AB - The atmospheric laminar flame speeds of mixtures of air with ethylene, n-butane, toluene, ethylene-nbutane, ethylene-toluene, and n-butane-toluene were experimentally and computationally investigatedover an extended range of equivalence ratios. Binary fuel blends with 1:1, 1:2, and 2:1 molar ratios were examined. Experimentally, the laminar flame speeds were determined using digital particle image velocimetry (DPIV). Since the use of DPIV enables the mapping of the two-dimensional flow field ahead of the flame, the reference speed based on the minimum axial velocity point as well as the imposed strain rate can be identified simultaneously. The latter can now be unambiguously determined by the radial velocity gradient at the minimum velocity point. By systematically varying the imposed strain rate, the corresponding laminar flame speed was obtained through nonlinear extrapolation to zero strain rate. The associated experimental accuracy of the DPIV measurements was also assessed and discussed. Computationally, the laminar flame speeds were simulated for all single-component fuel/air and binary fuel blend/air mixtures with a detailed kinetic model. Comparison of experimental and computed flame speeds shows generally good agreement. A semiempirical mixing rule was developed. The mixing rule, which requires only the knowledge of the flame speeds and flame temperatures of the individual fuel constituents, is shown to provide accurate estimates for the laminar flame speeds of binary fuel blends under the conditions tested.
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U2 - 10.1016/s1540-7489(02)80175-4
DO - 10.1016/s1540-7489(02)80175-4
M3 - Conference article
AN - SCOPUS:0038642429
SN - 1540-7489
VL - 29
SP - 1427
EP - 1434
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 2
Y2 - 25 July 2004 through 30 July 2004
ER -