In order to investigate the influence on combustion by changing the injection positions in the rocket induced secondary combustion

the numerical simulation was used to study the rule of the distribution of component in the flow

the area of high temperature heat release and the distribution of pressure in the flow.The results show that:the combustion flow is obviously affected by changing the injection positions.In the combustor

the combustion performance could be improved by putting the fuel injection position forwards

helping to strengthen the mixing capability of fuel.For the fuel mixed ahead the flame of primary rocket

it accelerates the fuel spray evaporation effect

improves the flame spread and increases the combustion efficiency.In order to improve the performance of combustion in the rocket induced secondary combustion

the fuel injection positions should be placed at front end in the combustor.