Emissions Analysis of Multi-Point Lean Direct Injection Combustor: A Combined Experimental and Simulation Study
Keywords:
Simulation Study, Auto Ignition, Flashback, Combustion InstabilityAbstract
The International Civil Aviation Organisation (ICAO) has strengthened its emission standards for civil aviation engines, particularly those governing NOx emissions, in response to the increased public awareness of pollution emissions from commercial aero-engines. In order to lower the emissions from commercial aviation engines, this study designs a Five-Point lean direct injection (LDI) combustor with three swirler schemes. A numerical study is done on the combustor’s flow field. Additionally, experimental research is done on the main stage’s () combustion efficiency and gaseous emissions under various input conditions and fuel ratios. The corresponding results show that the combustion efficiency is 99.18%, 98.83%, 99.03% when the pilot stage operates alone, 99.69%, 99.23%, 99.75% when the pilot and main stages operate simultaneously, for a fuel-air ratio (FAR) between 0.0130 and 0.0283 and a value between 30% and 60%. The experimental results also show that the NOx emission drops as rises, proving that the convergent swirler has a huge advantage over Venturi in lowering NOx emissions.
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