Based on the three-dimensional numerical simulation and rig test

the effect of swirl cup's design parameters of head of flame tube

such as the relative flow rate and the swirl number of secondary swirler

on combustion performance of an aero-engine main combustor was researched. The researched performance includes the outlet temperature field distribution and nitrogen oxides (NOx) emissions.It is shown that the result of numerical simulation and rig test is consistent: with the increase of the secondary swirler's relative flow rate

the outlet temperature field of the main combustor deteriorates

and the nitrogen oxides emission slightly reduces;with the deviation of swirl number of the secondary swirler from the benchmark design value

the outlet temperature field deteriorates

while nitrogen oxides emission increases with the increase of swirl number.