Stability and Control of Liquid Propellant Rocket Systems

Within the limitations of assumptions made in the analysis presented herein, it appears that the problem of stability and control of bipropellant liquid rockets may be investigated with respect to system dynamics, combustion time lag, and interaction of these two. For the gaspressurized, bipropellant, liquid rocket system, stability criteria relating the system parameters have been established. Stability conditions for a typical pump-fed rocket are discussed. By the utilization of a suitable feedback control, it is theoretically demonstrated that bipropellant liquid rocket systems may be stabilized not only for system dynamics but also for any combustion time lag.