Numerical analysis of fluid transient during ground testing of Cryogenic propellant feed system

The fluid transient occurring in the cryogenic propellant feed system of the liquid propellant rocket engine during ground testing is considered. The valve characteristics and flow control strategy is observed to play a vital role in minimising the effect of the fluid transient in the pipeline and other equipment associated with the system. A one-dimensional numerical model is developed based on the finite volume method and the model is validated with the literature. The model is used to simulate the propellant feed system used during ground testing and to analyse the effect of various valve parameters on the fluid transient. Different valve parameters like closing characteristics, rangeability, and response time are modified and analysed. Valve sequencing of multiple valves present in the system is also performed. The results of different simulations performed were investigated and suggestions for selecting the suitable valve parameter for minimizing the fluid transient pressure are provided.