ZURUECK HOCH VOR INHALT SUCHEN

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Proposing Institution

Institut für Thermodynamik, Fakultät für Luft- und Raumfahrttechnik, Universität der Bundeswehr
Project Manager

Prof. Dr. Michael Pfitzner
Werner-Heisenberg-Weg 39
85577 Neubiberg
Abstract
Low temperature flows in high pressure environments, like they occur in rocket combustion chambers, are affected significantly by molecular interaction phenomena. These effects are very important in rocket combustion simulations where the propellants are injected at temperatures around 100 K into a high-pressure environment of 100 to 200 atm. In the recent years the interest in simulation tools able to predict flows under these conditions has been rising as a detailed knowledge of the flow field is needed to develop reliable high performance rocket engines at reasonable cost.The effects of molecular interaction can be accounted for using a real gas equation of state accounting for the volume of the molecules in the fluid and attractive and repulsive forces between the single molecules. This equation of state provides a relation for pressure, temperature and density and is also applied to calculate departures from an ideal gas behavior for enthalpy, specific heat and entropy of the pure fluid or mixture. High pressure effects in the transport properties have been accounted for using an empirical correlation.Additionally to a very detailed modelling of thermodynamic effects, turbulent mixing plays a major role in the combustion processes within a rocket engine. The propellants are mixing in a very turbulent manner and the jets of adjacent injectors are highly interacting with each other. The flow therefore is strongly three-dimensional and unsteady, giving rise to use Large Eddy Simulation (LES) instead of classical Reynolds Averaged Navier Stokes (RANS) simulations to obtain reasonable results. For this reason LES techniques will be validated against DNS simulations and later applied to large scale computations.

Impressum, Conny Wendler