The abnormal friction between the vane and the casing is the main heat source of titanium fire in the aero-engine. In this paper

micro-protrusion / micro-debris of aero-engine titanium alloy friction ignition process is taken as the research object

a micro-scale ignition model considering friction heat source is established

and the influence rules of particle size

friction coefficient

oxygen concentration and flow velocity are calculated and analyzed

and compared with the classic model. The results show that the critical ignition temperature and delay time continue to decrease with decreasing particle size

increase with decreasing friction coefficient

decrease with increasing oxygen concentration

and increase with increasing flow velocity; When the particle size is 82.5μm

the critical ignition temperature of the classic model and friction model are 825K and 677K

respectively

and the ignition delay time is 0.035s and 0.032s respectively; when the friction coefficient decreases by 0.2

the critical ignition temperature increases by about 20K

the ignition delay time increase by about 10s; when the oxygen concentration reached 50%

the ignition temperatures of the classic model and friction model are 826K and 782K

respectively; when the flow velocity is 310m/s

the critical temperatures of the classic model and friction model are 966K and 964K

respectively

the ignition delay time is 0.54s and 0.43s respectively.