The hydrogen-fueled engine NK-88 turbopump unit rotor speed control circuit dynamics

Created in the 1980s hydrogen-fueled engine NK-88 turbopump unit rotor speed automatic control circuit linearized model is presented. The heat exchanger-gasifier system of the NK-88 engine fuel supply and control system leads to a significant lag, which is the main factor determining the system configuration. Turbo-pump unit also has a time lag, the impact of which should be considered when choosing the structure and parameters of the system. The article shows the study of fundamental solutions to select the fuel supply and control cascade system. The experimental frequency characteristics of the heat exchanger and other parts of the control loop presented. The measures to offset the impact of the heat exchanger delay on the stability of the system proposed.