A series of ignition tests were conducted to study the similarities and differences of lean ignition limits among single-sector

multi-sector and full annular combustors. Furthermore

major factors causing the differences were analyzed. Based on Lefebvres ignition model

empirical lean ignition limit correlations of different combustors were summarized by data fitting method

together with the conversion formulas there in. Results show that: different types of combustors exhibit similar lean ignition limit changing pattern

but the lean ignition fuel air ratio of full annular combustor are obviously lower than those of single-sector and multi-sector combustors under same conditions.