Pollutant levels of oxides of nitrogen, unburned.hydrocarbons and carbon monoxide were measured for an experimental, annular, swirl-can combustor. The combustor was h2 inches in diameter, incorporated 120 modules and was specifically designed for elevated exit temperature performance, Test conditions included combustor inlet temperatures of 600°, 900° and 1050° F, inlet pressures of 5 to 6 atmospheres, reference velocities of 69 to 120 feet per second and fuel-air ratios of 0.014 to 0=0695o Tests were also conducted at a simulated engine idle condition. Results demonstrated that swirl-can combustors produce oxides of nitrogen levels substantially lower than conventional combustor designs. These reductions are attributed to reduced dwell times resulting from short combustor: length, quick mixing of combustion gases with diluent air, and to uniform fuel distributions resulting from the swirl-can approach. Radial staging of fuel at idle conditions resulted in substantial increases in combustion efficiencies and corresponding reductions in pollutant levels,
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