Two fuel-rich combustion schemes in air/kerosene gas generator were provided

and two gas generators with flame stabilized by bluff-body

swirling air and second air injection respectively were designed based on the fuel-rich combustion characteristics of air/kerosene. A series of hot fire experiments were conducted with two gas generators to compare the ignition and combustion characteristics of the two schemes. The results show that excess oxidizer coefficient is the most important working parameter in gas generator. With the increase of excess oxidizer coefficient

the states of gas generators vary from start failure to abnormal shut up

and finally to normal start. The range of stable working excess oxidizer coefficient in bluff-body stabilized gas generator is 0.518

and can be expanded to 0.237 by stabilizing flame through swirling air and second air injection

which greatly increases the working range of gas generator. The fuel-rich combustion efficiency of swirling air and second air injection stabilized gas generator is 20% higher than that of bluff-body stabilized gas generator. As the complexity of the two schemes is comparable

swirling air and second air injection stabilized gas generator could have a longer working time without cooling the flame holder.