A study into controlling the ratio and the total mass flow rate of propellant components for the main engine of an advanced upper stage

The paper presents operating principles of the path for controlling the ratio and the total mass flow rate of propellant components in the high-efficiency engine for an advanced upper stage, and a procedure for studying the effects of destabilizing factors on the accuracy of maintaining the ratio and the total mass flow rate of propellant components. It provides an analytical demonstration of the feasibility of achieving the 0.8% accuracy of maintaining the ratio and the total mass flow rate of propellant components (while the requirement is 1%), thus enabling a significant reduction in the safe propellant margin for the upper stage.