Experimental and numerical prediction of LBO performance in a centrally staged combustor

•A new type of centrally staged combustor is proposed for fuel–air ratio of the aeroengine combustor of 0.037.•Characteristics of the polit stage outlet are important factors affecting the LBO of the combustor.•The best rotation direction combination of swirler on improving LBO performance was obtained.•Fuel steady state successive approximation method was used to obtain LBO limit.•The recirculation zone of each scheme in LBO is studied by numerical calculation.