The spontaneous ignition performances of a cavity-based strut flameholder were preliminarily investigated with spray distances of 5－50mm at atmospheric pressure

the air temperature and oxygen volume fraction were within the range of 750－900℃ and 13.4%－15.8%

Mach number ranged from 0.20－0.28. Results showed that the flameholder could be autoignited when the inlet temperature was above 850℃. As the inlet temperature increased

the performances of spontaneous ignition improved. When the inlet Mach number became larger

the temperature range for successful spontaneous ignition became narrower. With the increase of fuel injection distance

the autoignition performances of the stabilizer were improved. The cavity structure of the stabilizer could stabilize the flame.