The gas generator system with adjustable flow of ducted ramjet has strong time-varying and non-linearity. Anti-regulation of gas flow exists in the initial stage of regulation. And the in the gas generator system with adjustable flow of ducted ramjet has strong time-varying and non-linearity attributes. Anti-regulation of gas flow exists in the initial stage of regulation. And the incomplete combustion of propellant is easily adhered to throat. These factors will have a negative impact on the regulation performance. In order to solve this problem

the linear active disturbance rejection controller (LADRC) was designed. Simulation results showed that: compared with the proportion-integration-differentiation (PID) controller

the LADRC had better response speed

accuracy

flow anti-regulation suppression ability and anti-interference ability. The response time under low and high pressure conditions was less than 1.5 s

the overshoot was less than 1.5%

and the flow anti-regulation was reduced by 3-4 times. The reaction time to interference was about 0.4 s

and the deviation value of interference was only 0.25 MPa

thus significantly improving the performance of gas generator.