caa a22 4500 606244891 CHVBK 20210128101332.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s12567-015-0076-2 doi (NATIONALLICENCE)springer-10.1007/s12567-015-0076-2 Theoretical and experimental analysis of liquid layer instability in hybrid rocket engines [Elektronische Daten] [Mario Kobald, Isabella Verri, Stefan Schlechtriem] The combustion behavior of different hybrid rocket fuels has been analyzed in the frame of this research. Tests have been performed in a 2D slab burner configuration with windows on two sides. Four different liquefying paraffin-based fuels, hydroxyl terminated polybutadiene (HTPB) and high-density polyethylene (HDPE) have been tested in combination with gaseous oxygen (GOX). Experimental high-speed video data have been analyzed manually and with the proper orthogonal decomposition (POD) technique. Application of POD enables the recognition of the main structures of the flow field and the combustion flame appearing in the video data. These results include spatial and temporal analysis of the structures. For liquefying fuels these spatial values relate to the wavelengths associated to the Kelvin Helmholtz Instability (KHI). A theoretical long-wave solution of the KHI problem shows good agreement with the experimental results. Distinct frequencies found in the POD analysis can be related to the precombustion chamber configuration which can lead to vortex shedding phenomena. CEAS, 2015 Hybrid rocket propulsion nationallicence Paraffin fuel nationallicence Optical investigation nationallicence Proper orthogonal decomposition nationallicence Kobald Mario DLR, Institute of Space Propulsion, Lampoldshausen, Germany aut Verri Isabella Politecnico di Milano, Milan, Italy aut Schlechtriem Stefan DLR, Institute of Space Propulsion, Lampoldshausen, Germany aut CEAS Space Journal Springer Vienna 7/1(2015-03-01), 11-22 1868-2502 7:1<11 2015 7 12567 https://doi.org/10.1007/s12567-015-0076-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s12567-015-0076-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kobald Mario DLR, Institute of Space Propulsion, Lampoldshausen, Germany aut NATIONALLICENCE 700 1- Verri Isabella Politecnico di Milano, Milan, Italy aut NATIONALLICENCE 700 1- Schlechtriem Stefan DLR, Institute of Space Propulsion, Lampoldshausen, Germany aut NATIONALLICENCE 773 0- CEAS Space Journal Springer Vienna 7/1(2015-03-01), 11-22 1868-2502 7:1<11 2015 7 12567