Laminar Flame Speeds and Extinction Limits of Conventional and Alternative Jet Fuels
Authors: K. Kumar, C. J. Sung, and X. Hui
Direct link to the paper: http://dx.doi.org/10.1016/j.fuel.2010.11.022
Experimental results of laminarflamespeeds and extinction stretch rates for the conventional (Jet-A) and alternative (S-8) jetfuels are acquired and compared to the results from our earlier studies for neat hydrocarbon surrogate components, including n-decane and n-dodecane. Specifically, atmospheric pressure laminarflamespeeds are measured using a counterflow twin-flame configuration for Jet-A/O2/N2 and S-8/O2/N2mixtures at preheat temperatures of 400, 450, and 470 K and equivalence ratios ranging from 0.7 to 1.4. The flow field is recorded using digital particle image velocimetry. Linear extrapolation is then applied to determine the unstretched laminarflamespeed. Experimental data for the extinction stretch rates of the nitrogen diluted jetfuel/oxidizer mixtures as a function of equivalence ratio are also obtained. In addition, the experimental data of Jet-A are compared to the computed values using a chemical kinetic mechanism for a kerosene surrogate reported in literature. A sensitivity analysis is further performed to identify the key reactions affecting the laminarflamespeed and extinction stretch rate for this kerosene surrogate.
Citation: K. Kumar, C. J. Sung, and X. Hui, “Laminar Flame Speeds and Extinction Limits of Conventional and Alternative Jet Fuels,” Fuel 90 (3), 1004-1011 (2011).