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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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Analytical model for electrohydrodynamic thrust.

Ravi Sankar Vaddi1, Yifei Guan2, Alexander Mamishev3

  • 1Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.

Proceedings. Mathematical, Physical, and Engineering Sciences
|October 19, 2020
PubMed
Summary
This summary is machine-generated.

Electrohydrodynamic (EHD) thrust, generated by accelerating ionized fluid in an electric field, is modeled using momentum transfer principles. This validated analytical model accurately predicts EHD thrust for propulsion system design and simulations.

Keywords:
EHD thrustMott–Gurney lawcorona dischargeelectrohydrodynamicsionic wind

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Area of Science:

  • Aerospace Engineering
  • Plasma Physics
  • Fluid Dynamics

Background:

  • Electrohydrodynamic (EHD) thrust arises from the acceleration of ionized fluids within an electric field.
  • This process involves momentum transfer between charged and neutral particles.
  • Existing analytical models require extension to accurately predict EHD thrust.

Purpose of the Study:

  • To extend an analytical model for electrohydrodynamic (EHD) thrust.
  • To couple space charge, electric field, and momentum transfer dynamics.
  • To derive a first-principles expression for EHD thrust in one-dimensional planar coordinates.

Main Methods:

  • Developed an analytical model integrating space charge, electric field, and momentum transfer.
  • Expressed electric current density using the Mott-Gurney law.
  • Corrected the model for drag force and validated against experimental data.

Main Results:

  • The extended EHD thrust model shows good agreement with experimental data from multiple studies.
  • A derived expression for EHD thrust was obtained from first principles.
  • The model successfully incorporates the Mott-Gurney law for electric current density.

Conclusions:

  • The validated analytical model provides an accurate method for predicting EHD thrust.
  • The derived EHD thrust expression is suitable for designing propulsion systems.
  • The model can be readily implemented in numerical simulations for further research.