近吹熄 RP-3 旋流喷雾火焰结构实验研究

Lean fuel combustion is one of the combustion organization modes of advanced low-emission aeroengine，but it tends to cause the problem of blow-out. In this study，laser diagnosis research was carried out for RP-3 aviation kerosene swirling spray flame under different thermal powers. The synchronous measurement of OH/Kerosene-PLIF and OH-PLIF/CH^* chemiluminescence was carried out，and the mechanism of spray lean blow-out was described. The results show that the blow-out limit is almost the same under different thermal powers，and the flame structure is similar under near-blow-out conditions. Under near-blow-out conditions，on the one hand，the cold air at the downstream of the combustion chamber flows back to the inner recirculation zone，resulting in the temperature reduction of the inner recirculation zone，and on the other hand，the fuel evaporation causes the instability of the flame root. The interaction of the two causes the partial and even overall blow-out of the flame.