Simple model of multi-scale and multi-site emissions for porous ionic liquid electrospray thrusters

Author:

Takagi Koki12ORCID,Yamashita Yusuke2ORCID,Tsukizaki Ryudo3ORCID,Nishiyama Kazutaka3ORCID,Takao Yoshinori4ORCID

Affiliation:

1. Department of Mechanical Engineering, Materials Science, and Ocean Engineering, Yokohama National University 1 , Yokohama 240-8501, Japan

2. Department of Aeronautics and Astronautics, The University of Tokyo 2 , Bunkyo-ku, Tokyo 113-8656, Japan

3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency 3 , Sagamihara 252-5210, Japan

4. Division of Systems Research, Yokohama National University 4 , Yokohama 240-8501, Japan

Abstract

Ionic liquid electrospray thrusters represent an alternative propulsion method for spacecraft to conventional plasma propulsion because they do not require plasma generation, which significantly increases the thrust efficiency. The porous emitter thruster has the advantages of simple propellant feeding and multi-site emissions, which miniaturize the thruster size and increase thrust. However, the multi-scale nature, that is, nano- to micrometer-sized menisci on the millimeter-size porous needle tip, makes modeling multi-site emissions difficult, and direct observation is also challenging. This paper proposes a simple model for multi-site emissions, which assumes that the ionic conductivity or ion transport in the porous media determines the ion-emission current. The conductivity was evaluated by comparing the experimental and numerical data based on the model. The results suggest that the ionic conductivity of the porous emitter is suppressed by the ion–pore wall friction stress. Additionally, the model indicates that the emission area expansion on the porous emitter creates the unique curve shape of the current vs voltage characteristics for multi-site emissions.

Funder

Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research

The Advisory Committee for Space Engineering of Japan Aerospace Exploration Agency

Grant-in-Aid for Exploratory Research in the area of. human space technology and space exploration

Japan Science and Technology Agency, Fusion Oriented REsearch for disruptive Science and Technology program

Publisher

AIP Publishing

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