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Large-eddy-simulation of turbulent flow phenomena with regard to destabilizing processes of liquid jet break up in high pressure H_2/O_2 rocket engines / Grobstruktur-Simulation turbulenter Stroemungsphaenomene im Hinblick auf destabilisierende Prozesse beim Strahlzerfall in Hochdruck-H_2/O_2-Raketentriebwerken

Authors
  • Deutsche Forschungsanstalt fuer Luft- un...
Publication Date
Jan 01, 1994
Source
OpenGrey Repository
Keywords
Language
German
License
Unknown

Abstract

Internal turbulence of the injector flow and the liquid free jet is identified as the mechanism that induces primary disturbances at the liquid jet surface emerging from the coaxial injector in high pressure H_2/O_2 rocket engines. Large-Eddy-Simulation of the turbulent flow field is applied for various cases of the injector flow. Based on the injector flow, turbulence evolution inside the emerging free jet is simulated by computing the relaxation of turbulence between pseudo walls assuming slip conditions. Presentation of momentary as well as time averaged results gives a physical insight in the spatial and temporal processes of turbulence for several fluids under various boundary conditions. Correlations were found between experimentally observed surface perturbations at the liquid jet surface directly after injector exit and computed length as well as velocity scales of coherent turbulent structures in the liquid core flow inside the injector. (orig.) / SIGLE / Available from TIB Hannover: RN 437(94-28) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / DE / Germany

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