Modelling, simulation, and optimization of a hot pressurization system for a liquid propellant space engine and comparison with experimental results

The main objective of this paper is to optimize the performance of a gas generator (GGO) in order to reduce propellant consumption, flyweight, and contamination. Hence, the periodic operation of a GGO is offered. For this purpose, a non-linear modelling and dynamic simulation of a hot pressurization system is developed in order to predict the history of pressure, temperature, and mass flowrate of pressurant and propellant during the expulsion of the propellant from a tank. This model calculates the change in ullage volume owing to expulsion of the propellant. It also considers the net heat transfer in the ullage space. The new approach is validated using experimental results. It is noticeable that despite other modelling approaches, the present pressurization system modelling is not decoupled from the turbopump system. It means that the interaction is observed between these two systems. Finally, the periodic operation of a GGO is compared with its normal performance, and acceptable results are obtained.