Thomas Kick

An Experimental and Modeling Study of Laminar Flame Speeds of Alternative Aviation Fuels

The present work reports on measurements of burning velocities of synthetic fuel air mixtures exploiting the cone-angle method, as part of the EU project ALFA-BIRD. The GtL (Gas-to-Liquid)-air mixtures — (i) 100% GtL and (ii) GtL+20% hexanol, respectively — were studied at atmospheric pressure, with values of the equivalence ratio φ ranging between φ ∼ 1.0 and φ ∼ 1.3, at preheat temperatures To = 423 K (GtL+20% hexanol) as well as To = 473 K (for 100% GtL and GtL+20% hexanol). A comparison between experimentally obtained burning velocities and predicted values of laminar flame speed is presented, too. In general, good agreement was found between predicted and measured data for the range of conditions considered in the present study. The predictive capability of the detailed reaction model consisting of 3479 reactions involving 490 species will be discussed focusing on the laminar flame speed and the combustion of the components (n-decane, iso-octane, and 1-hexanol) of the surrogate used.Copyright

An Investigation on Laminar Flame Speed as Part of Needed Combustion Characteristics of Biomass-Based Syngas Fuels

The present work reports on laminar flame speed measurements with biogenic gas mixtures over a wide range of parameters, such as preheat temperatures, pressure, equivalence ratio, and gas compositions. The biogenic gas mixtures were derived from gasification of ethanol and of corn silage as representatives for alternative fuels containing hydrogen and methane as major components (after CO2 -sequestration), light hydrocarbons to some extent, and diluents such as nitrogen and carbon monoxide. In the present work, premixed flames were stabilized in a high pressure burner system at pressures up to 6 bars at preheat temperatures between 323 and 453 K and for equivalence ratios of φ = 0.5–1.6. In addition, a gas mixture of methane and hydrogen burning in air was investigated at atmospheric pressure. Furthermore, different detailed reaction mechanisms were used to predict the measured data. The trends and main features were captured by predictions applying different reaction mechanisms.© 2007 ASME