Electrostatic Precipitation in the Martian Environment 1

Hiroyuki Kawamoto, Shunpei Kojima

    研究成果: Article

    抄録

    Because the Martian atmosphere is composed mainly of CO2, electrochemical conversion of CO2 to O2 is one of the most efficient methods of extracting oxygen, which is indispensable for astronauts to breathe and can be used as an oxidant for rocket engines. In order to realize a reliable oxygen production system, a large amount of CO2 gas must be accumulated and compressed in an electrolytic conversion system. However, dust present in the Martian atmosphere because of dust storms could damage the oxygen conversion system or cause it to malfunction. Thus, a dust removal system is necessary before CO2 gas can be introduced into the system. To this end, an electrostatic precipitator suitable for use in the low-pressure Martian atmosphere has been developed. First, a precipitator consisting of a wire and parallel-plate electrodes was constructed. In a preliminary study, the efficiency of dust removal was 75%-80% without corona discharge, and almost no dust was collected at the corona discharge region in the low-pressure (700 Pa) CO2 atmosphere that simulated the Martian atmosphere. In this case, dust was collected on the surface of the wire electrode, contrary to the case for a pressure of 105 Pa (1 atm). The mechanism of these phenomena was investigated by direct observation and numerical calculation of particle motion in the precipitator. It was clarified that the low charge density of particles in the low-pressure atmosphere caused a relatively large dielectrophoresis force in comparison with the Coulomb force, and the particles were attracted to the wire electrode, i.e., the dielectrophoresis forces dominate in the low-pressure regime, whereas Coulomb forces dominate in the high-pressure regime. Poor performance in the low-pressure atmosphere was caused by the low charge density and low electrostatic field owing to the low limited voltage. Although the performance deteriorated rapidly in the low-pressure atmosphere because of the deposition of dust on the fine wire electrode, it was easy to vibrate the wire electrode and remove dust on the wire.

    元の言語English
    記事番号04019006
    ジャーナルJournal of Aerospace Engineering
    32
    発行部数3
    DOI
    出版物ステータスPublished - 2019 5 1

    Fingerprint

    Dust
    Electrostatics
    Wire
    Electrodes
    Oxygen
    Charge density
    Electrophoresis
    Gases
    Electrostatic precipitators
    Rocket engines
    Oxidants
    Electric fields
    Electric potential

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Materials Science(all)
    • Aerospace Engineering
    • Mechanical Engineering

    これを引用

    Electrostatic Precipitation in the Martian Environment 1 . / Kawamoto, Hiroyuki; Kojima, Shunpei.

    :: Journal of Aerospace Engineering, 巻 32, 番号 3, 04019006, 01.05.2019.

    研究成果: Article

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    abstract = "Because the Martian atmosphere is composed mainly of CO2, electrochemical conversion of CO2 to O2 is one of the most efficient methods of extracting oxygen, which is indispensable for astronauts to breathe and can be used as an oxidant for rocket engines. In order to realize a reliable oxygen production system, a large amount of CO2 gas must be accumulated and compressed in an electrolytic conversion system. However, dust present in the Martian atmosphere because of dust storms could damage the oxygen conversion system or cause it to malfunction. Thus, a dust removal system is necessary before CO2 gas can be introduced into the system. To this end, an electrostatic precipitator suitable for use in the low-pressure Martian atmosphere has been developed. First, a precipitator consisting of a wire and parallel-plate electrodes was constructed. In a preliminary study, the efficiency of dust removal was 75{\%}-80{\%} without corona discharge, and almost no dust was collected at the corona discharge region in the low-pressure (700 Pa) CO2 atmosphere that simulated the Martian atmosphere. In this case, dust was collected on the surface of the wire electrode, contrary to the case for a pressure of 105 Pa (1 atm). The mechanism of these phenomena was investigated by direct observation and numerical calculation of particle motion in the precipitator. It was clarified that the low charge density of particles in the low-pressure atmosphere caused a relatively large dielectrophoresis force in comparison with the Coulomb force, and the particles were attracted to the wire electrode, i.e., the dielectrophoresis forces dominate in the low-pressure regime, whereas Coulomb forces dominate in the high-pressure regime. Poor performance in the low-pressure atmosphere was caused by the low charge density and low electrostatic field owing to the low limited voltage. Although the performance deteriorated rapidly in the low-pressure atmosphere because of the deposition of dust on the fine wire electrode, it was easy to vibrate the wire electrode and remove dust on the wire.",
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