Pylypenko, O. Solving Current Problems in the Dynamics of Space-Rocket Systems. In: Guz, A.N., Altenbach, H., Bogdanov, V., Nazarenko, V.M. (eds) Advances in Mechanics. Advanced Structured Materials, Springer Cham, vol. 191, 2023, P. 417 – 433. https://doi.org/10.1007/978-3-031-37313-8_24
This paper overviews the main results obtained over the past few years in the solution of current problems in the dynamics of liquid-propellant rocket engines (LPREs), the pogo stability of liquid-propellant launch vehicles, vibration protection system dynamics, the gas dynamics of aircraft gas turbine engine components, and the dynamics of hydraulic systems with cavitating components. These results are as follows. A mathematical model of LPRE pump dynamics was developed. The model complements a hydrodynamic model of LPRE cavitating pumps by allowing a mathematical simulation of choking regimes. An approach was developed to construct a nonlinear mathematical model of LPRE hydraulic line filling. The approach allows one to automatically change, if necessary, the finite-element partitioning scheme of a hydraulic line in the process of its filling during LPRE startup calculations. An investigation was conducted into the startup dynamics of a multiengine liquid-propellant propulsion system that consists of four staged-combustion oxidizer-rich LPRDs, taking into account the possibility of their nonsimultaneous startups. The maximum values of oxidizer and fuel pressure surges and undershoots at the liquid-propellant jet system (LPJS) inlet during an engine startup and shutdown were determined and used in determining the LPJS operability during a startup and a shutdown of the RD 861K sustainer engine. The pogo stability of the Cyclone-4M launch vehicle was analyzed theoretically using Nyquist’s criterion. A numerical approach was developed to characterize acoustic oscillations of the combustion products in annular rocket combustion chambers with an account for the configuration features of the fire space and the variation of the physical properties of the gaseous medium with the axial length of the chamber. A prototype vibration protection system was developed and made, and its dynamic tests confirmed its high efficiency in damping impact and harmonic disturbances. Approaches were developed for the aerodynamic improvement of aircraft gas turbine engine components.
