An air/kerosene torch igniter was designed to solve the ignition problem of scramjet. The energy of igniter was 300kW

the mass flux of air and kerosene was 98.9g/s and 6.7g/s at design point respectively. Under different equivalence ratio (ER) conditions

the physical and chemical parameters of out-flow at the exit of igniter were computed by CHEMKIN 4.0. The working model of igniter was optimized as “oxygen-rich model”. Kerosene was injected from swirl injectors at one end of igniter. Air was injected through two loops

i.e. “first injector” and “second injector”. The mixture of air and kerosene was ignited by a normal spark used in the car engine. The experimental system was established. The pressure measuring and photographs showed that the igniter could work reliably within ER range of 0.3-1.3. The starting time of the igniter was about 0.9s and the length of flame was 30cm. A pulse combustion phenomenon was represented by the high frequency and low amplitude fluctuating of pressure in igniters combustor. Scramjet could be ignited by this igniter reliably in experiments.