Effects of Fuel-Injector Design on Ultra-Lean Combustion Performance

摘要

Emissions data were obtained for six fuel-injector configurations tested with ultra-lean combustion at an inlet-air temperature of 1200 K, a pressure of 250 kPa, and a reference (inlet) velocity of 32 m/s. Fuel injectors included three multiple-source designs and three configurations using a single air-assist injector. Only the multiple-source fuel injectors provided acceptable emissions. Values below the program goals of 16 g CO/kg fuel, 1.9 g HC/kg fuel, and 1.9 g NO sub 2 /kg fuel were obtained for the combustion temperature range of 1450 to 1700 K for both a high blockage (41.1% open area) 42-source injector. The study thus showed that high fuel-injector pressure drop may not be required to achieve low-emissions performance at high inlet-air temperatures when the fuel is well-dispersed in the airstream. Further evaluation of both single-source and multiple-source fuel injection systems is required. (ERA citation 81:025864)