Jet Shear Layer Turbulent Diffusion Flames for Ultralow NOx Emissions

[+] Author and Article Information
A. F. Ali Al-Shaikhly, G. E. Andrews, C. O. Aniagolu

Department of Fuel and Energy, The University of Leeds, Leeds, LS2 9JT, United Kingdom

J. Eng. Gas Turbines Power 114(1), 55-62 (Jan 01, 1992) (8 pages) doi:10.1115/1.2906307 History: Received January 20, 1990; Online April 24, 2008


Direct fueling of each shear layer generated by an array of holes in a grid plate was shown to have ultralow NOx emissions combined with a good flame stability, compared with a premixed system. Two methods of fuel injection were investigated that had opposite NOx /stability characteristics. Four shear layers in a 76-mm combustor were used at gas turbine primary zone operating conditions with 60 percent simulated primary zone air at one bar pressure. The fuels used were propane and natural gas and a minimum NOx emission of 2.5 ppm at 15 percent oxygen, compatible with a 0.1 percent inefficiency, was demonstrated for natural gas with a reasonable stability margin. These designs have the potential for a dry NOx solution to any current or proposed gas turbine NOx regulation for natural gas.

Copyright © 1992 by The American Society of Mechanical Engineers
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