Multifunctional Fuel Additives for Reduced Jet Particulate Emissions
Final rept. 4 Aug 2003-3 Dec 2005
REACTION ENGINEERING INTERNATIONAL SALT LAKE CITY UT
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This report was developed under SBIR contract. A study on fuel additives to suppress soot emissions from gas turbines burning JP-8 was completed. The program consisted of a multifaceted approach involving experimental and computational screening tools to assess the effectiveness of multifunctional additives. The experimental program demonstrated that a laminar drop tube furnace at the University of Utah could effectively screen a large number of additives relatively rapidly and inexpensively as a function of furnace temperature, injection orifice size, injection pressure, and oxygen concentration. Additives were found to be most effective under highly oxidizing conditions. Soot reductions of over 90 were observed for metal-containing additives, know ignition enhancers, and a range of proprietary additives. Modeling capabilities for assessing the effectiveness of additives were developed. Soot models using the method of moments and sectional methods were combined with detailed kinetics models for surrogates of JP-8. the models were validated with experimental data in the literature for a number of simple fuels. Detailed Kinetic mechanisms were developed for two ignition enhancers in the study, di-tertiary butyl peroxide and 2-ethyl-hexyl-nitrate. The kinetic models were incorporated in a CFD code to evaluate diffusion flames representative of the drop tube and swirl stabilized combustor.