The combustion characteristics of premixed C1-C4 alkane jet flames were studied experimentally with a slit burner between two parallel walls. The effects of wall temperature

the distance between two walls

equivalence ratio and fuel type on flame pattern and stability were investigated. The flame images were captured by using a high-speed charge-coupled device camera. The results indicated that the flames experienced three states with the decrease of the distance between the walls

i.e.

stable flame

pulsating flame and flame extinction. It was found that the pulsating flames only existed in a very narrow range before reaching the extinction distance. The flame pulsation frequency increased monotonically with the wall temperature. For the same fuel

the frequency was independent to the distance between two walls at a fixed wall temperature and equivalence ratio. Meanwhile

the flame pulsation frequency and the range of the pulsation zone were related to the type of fuel for premixed C1-C4 alkane flames. Generally

the methane flame showed the lowest pulsation frequency and narrowest pulsation zone

while these characteristics were almost the same for C2-C4 alkane flames.