Experimental and Simulation Study on the Emissions of a Multi-Point Lean Direct Injection Combustor

Spurred by the world’s attention to pollution emissions from commercial aero-engines, the International Civil Aviation Organization (ICAO) has made more stringent emission regulations for civil aircraft engines, especially the NOx emission.This paper develops a Five-Point lean direct injection (LDI) combustor with three swirler schemes to reduce the emissions of commercial aircraft engines. The flowfield of the combustor is studied numerically. Moreover, the combustion efficiency and gaseous emissions in different inlet conditions and fuel ratios of the main stage (α) are studied experimentally. The corresponding results reveal that, under a fuel-air ratio (FAR) between ۰.۰۱۳۰ and ۰.۰۲۸۳ and an α value between ۳۰% and ۶۰%, the combustion efficiency is ۹۹.۱۸%, ۹۸.۸۳%, and ۹۹.۰۳% when the pilot stage works alone, and ۹۹.۶۹%, ۹۹.۲۳%, and ۹۹.۷۵% when the pilot and main stage work simultaneously. Furthermore, the experimental results suggest that the NOx emission decreases as α increases, demonstrating that the convergent swirler has a tremendous advantage in reducing NOx emissions over Venturi.

کلیدواژه ها:

LDI technology ، NOx emissions ، Combustion performance ، Combustor ، Venturi