Achieving rapid mixing is the main challenge to reducing NOx levels in non-premixed liquid fired gas turbine combustors. Multipoint lean direct injection (LDI) is among the techniques used to achieve low emissions and good mixing by injecting fuel in small amounts through different injection ports. This study looks at the flow characteristics of a nozzle using this concept. The Parker Hannifin injector used is a square matrix of nine simplex fuel nozzles. Phase Doppler particle analyzer was used to measure both the spray characteristics as well as the gaseous phase turbulence flow field. The average velocities, Reynolds stresses and the Sauter Mean Diameter were measured at a series of positions downstream of the nozzle exit, x3, ranging from 0.6 to 7 times the swirl cup diameters.
An Experimental Investigation of the Flow Downstream of a Low NOx Gas Turbine Nozzle
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Boutazakhti, M, Yimer, I, Thomson, MJ, & Sullivan, PE. "An Experimental Investigation of the Flow Downstream of a Low NOx Gas Turbine Nozzle." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 77-82. ASME. https://doi.org/10.1115/FEDSM2002-31073
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