By a News Reporter-Staff News Editor at Defense & Aerospace Week -- New research on Propulsion and Power is the subject of a report. According to news reporting originating in Cambridge, United Kingdom, by VerticalNews journalists, research stated, "This experimental study investigates the influence of fuel distribution on ignition outcome during high-altitude relight of a gas turbine. Planar laser-induced fluorescence is used to image fuel inside a lean direct-injection combustor under realistic conditions."
The news reporters obtained a quote from the research from the University of Cambridge, "A novel apparatus is developed to permit planar laser-induced fluorescence imaging, in which large quantities of poorly atomized fuel impinges on the internal surfaces of the combustor. Results reveal high variability in atomization quality. In the absence of flame, small droplets are confined to areas of recirculating flow, whereas large droplets impact on the walls. All fuel is introduced through a pilot air-blast atomizer close to the injector centerline. However, comparatively little fuel is apparent near the igniter tip because the outside swirlers of the fuel injector create a fast-moving stream of fuel-free air that flows directly below the upper combustor wall. The droplet size and fuel concentration in the main recirculation zone do not differ radically at test conditions with markedly different fuel-to-air ratios, suggesting that turbulent straining is a more important factor than equivalence ratio in the failure of ignition when the airflow rate is high. In the presence of flame, medium-sized burning droplets are observed close to the injector centerline."
According to the news reporters, the research concluded: "Flame interference resulting from fluorescence of polycyclic aromatic hydrocarbons is apparent, but small, suggesting that kerosene planar laser-induced fluorescence is a useful tool for the analysis of all stages of altitude relight."
For more information on this research see: Planar Laser-Induced Fluorescence Fuel Imaging During Gas-Turbine Relight. Journal of Propulsion and Power, 2013;29(4):961-974. Journal of Propulsion and Power can be contacted at: Amer Inst Aeronautics Astronautics, 1801 Alexander Bell Drive, Ste 500, Reston, VA 22091-4344, USA.
Our news correspondents report that additional information may be obtained by contacting R.W. Read, University of Cambridge, Cambridge CB2 1PZ, United Kingdom. Additional authors for this research include J.W. Rogerson and S. Hochgreb.
Keywords for this news article include: Europe, Cambridge, United Kingdom, Propulsion and Power
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