DEVELOPMENT OF A LIQUID-FUELED, LEAN-PREMIXED GAS-TURBINE COMBUSTOR

Development of a lean-premixed, liquid-fueled combustor is in progress to achieve ultra-low No(x) emissions at typical gas turbine operating conditions. A filming fuel injector design was tested on a bench scale can combustor to evaluate critical design and operating parameters for low-emissions performance. Testing was completed using No. 2 diesel. Key design variables tested include premixing length, swirler angle, injector centerbody diameter, and reduced liner cooling. NO(x) emissions below 12 ppmv at 9 bar pressure were measured. Corresponding CO levels were 50 ppmv. An optimized injector design was fabricated for testing in a three injector sector of an annular combustor. Operating parameters and test results are discussed in the paper.