To have good ignition performance of lean premixed swirling combustor (LPSC) at ultralow equivalence ratios

this paper researched experimentally the combustion characteristics of ignition processes for LPSC at the ultralow equivalence ratio conditions of 0.013~0.502 based on different conditions of ignition fuel ratio (Fn). The results indicate that

when F2=10 %

F3=15 % and F4=20 %

LPSC can ignite successfully at the equivalence ratio intervals of 0.063-0.251

0.042-0.377 and 0.05-0.502 respectively

and the minimum values of equivalence ratio for ignition process are respectively 0.063

0.039 and 0.011 by the fitting calculations of experimental results

but LPSC fails to ignite at F1=5 %. With decreasing equivalence ratio

the outlet temperature rise has a drop due to the increase of air massflow

which can lead to the rising of CH4 and CO concentrations and the deceasing of combustion efficiency simultaneously. LPSC can ignite successfully at relatively low equivalence ratio for high Fn

but in which combustion efficiency deceases and pollutant emissions rise because of too much air massflow. Thus

keeping a certain massflow of ignition fuel is beneficial for high-efficiency and rapid startup of LPSC at ultralow equivalence ratio.