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Experimental study on the solid-liquid equilibrium of cryogenic methane mixture propellant.

Number: 0036

Author(s) : LIU B., WANG L., SHI S., LI Y., LEI G.

Summary

The performance of cryogenic propellant could be effectively improved by providing subcooling, but the lowest subcooling temperature is restricted by the freezing point of fluid itself. For methane propellant, adding ethane or other light hydrocarbon into it could prepare a mixing propellant with a lower freezing point, which is beneficial for the subcooling acquisition as well as exploring subcooling potential. In this study, a test rig is developed to measure the freezing point temperature for methane-ethane binary system. In the tests, the temperature decreasing and increasing curves near freezing point are recorded, and a liquid nitrogen cooling method and a natural warming approach are adopted to provide thermal conditions. Twelve experimental cases with different methane proportions are performed. Moreover, ideal solution model, Scatchard-Hildebrand model, PR equation of state model, and SRK equation of state model are adopted to assist the analysis study. The experimental results show that the freezing point temperature of methane mixture decreases firstly as the increase of methane molar component and then increases as the further increase of methane proportion. It is speculated that the eutectic point of methane/ethane is about 73 K, which is about 17 K lower than the freezing point of pure methane.

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Pages: 7

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Details

  • Original title: Experimental study on the solid-liquid equilibrium of cryogenic methane mixture propellant.
  • Record ID : 30029026
  • Languages: English
  • Source: Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
  • Publication date: 2021/10/05
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2021.0036
  • Document available for consultation in the library of the IIR headquarters only.

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