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An Experimental Study on the Effects of Fischer-Tropsch (FT) Blends With Diesel #2 and JP5 on the Performance of a Rolls-Royce Model 250-C20B Gas Turbine Engine

[+] Author Affiliations
J. Alexander Islin, Martin Cerza

U.S. Naval Academy, Annapolis, MD

Peter E. Jenkins

University of Colorado at Denver, Denver, CO

Paper No. GT2010-22436, pp. 353-361; 9 pages
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME


Fischer-Tropsch fuel is created using a catalyzed reaction in which a blend of carbon monoxide hydrogen gas (syngas) is converted into liquid hydrocarbons over a metal catalyst. The length of the carbon chain completely depends on the reaction parameters (mainly on temperature), empowering the manufacturer to produce different types of fuel. In this experiment, a fuel known as FT8 was created using this method. It is a synthetic form of JP8, a common jet fuel used extensively in the U.S. Navy as well as many commercial applications. This synthetic fuel, unlike conventional Diesel fuels, is colorless and lacks the impurities found in fossil fuels. Because of the lack of additives in the fuel required by the Rolls-Royce Model 250-C20B, the fuel was mixed in varying quantities up to 50% with Diesel #2 and JP5. Utilizing specific equipment, the Model 250-C20B’s exhaust gas composition, power output, and thermodynamic efficiency were measured. Temperatures and pressures were measured for each of the gas turbine’s five state points. Exhaust gas composition and output shaft torque and speed were also measured. The results of these tests were compared with baseline runs conducted with 100% conventional fuels used. It was determined that the blending of fuels did not affect performance, positively or negatively, to any great degree. Power output, fuel consumption, and exhaust gas composition were not significantly affected by the use of mixing the Fischer-Tropsch fuel with the conventional fuels used. However, it was determined that some blends did outperform the baseline tests. It did appear that the 20%–40% blend ratio does slightly increase the fuel’s performance in the engine in most areas.

Copyright © 2010 by ASME
Topics: Gas turbines , Diesel



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