Abstract In recent years there has been a growing interest in methane as an alternative rocket fuel due to its favourable specific gravity, storage temperature and thermal stability, in addition to its ability to support In-Situ Resource Utilization. Due to these properties methane supports the ongoing design trend of strategic reduction in system complexity and increase of reusability. The current work presents a first step in addressing the lack of information in open literature on the characteristics of methane under conditions found in rocket nozzle cooling channels, i.e. elevated inflow temperature and a high single sided heat load. A new experimental facility has been established at KTH Royal Institute of Technology in cooperation with GKN Aerospace, and as part of ESA’s Future Launcher Preparatory Programme. This facility is shown to enable direct measurement of the Heat Transfer Coefficient (HTC) of methane under a range of conditions, with a limited uncertainty and good repeatability. For inflow temperatures of around 400 K, mass flows up to 15 g/s and pressures up to 3 MPa, it has been observed that the effect of single sided heating results in a significant development of the flow field, which influences the heat transfer in second half of the test section. This development results in an increase of the HTC towards the end of the cooling channel. No significant effect of the pressure on the HTC has been observed under the current experimental conditions.

    Highlights A new experimental facility for heat transfer measurements has been commissioned. The conjugate heat transfer in rocket nozzles cooling channels is considered. Initial results for super-critical methane have been obtained and analysed. The influence of single-sided channel heating on the flow development is observed. The observed trends agree with recent literature. A detailed uncertainty and repeatability analysis for the new setup is presented.


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    Titel :

    On the characterization of methane in rocket nozzle cooling channels


    Beteiligte:
    Heldens, Jules C. (Autor:in) / Fridh, Jens (Autor:in) / Östlund, Jan (Autor:in)

    Erschienen in:

    Acta Astronautica ; 186 ; 337-346


    Erscheinungsdatum :

    2021-05-21


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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