This paper reports on a preliminary study to examine the macroscopic effects of an applied magnetic field to the flow field around a NASA Orion CEV capsule geometry flying at a NASA Fire2 11,360 m/s reference flight condition. The CFD simulation predicts that a dipole magnetic field with \(B=0.78\)  T at the stagnation point produces a 10 times increase in shock stand-off and a Lorentz drag force equal to four times the non-MHD pressure drag force. Pressure drag is observed to reduce to 10% of its non-MHD magnitude, such that total drag increases to approximately three times the non-MHD value. Inspection of the flowfield for the MHD case indicates that separation occurs on the forebody which initiates a large recirculation region around the sides of the capsule which follows the direction of the magnetic field lines. The temperature is increased throughout the entire flow field around the capsule, which then results in an extensive region of subsonic flow extending far into the capsule wake. This suggests that a full CFD analysis of flow around the capsule and also its wake may be necessary even for simulations aiming only to resolve the forebody shock layer flow. Finally, it is observed that Hall parameter and Magnetic Reynolds number both greatly exceed 1, indicating that accurate CFD simulations of full scale flight vehicles at these conditions will need to account for both Hall effect and deformation of the applied magnetic field due to plasma flow through it.

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Effect of Magnetohydrodynamic Aerobraking on Flow Field Surrounding an Earth Re-entry Capsule

  • D. Gildfind,
  • P. Jacobs,
  • A. Lefevre,
  • R. Gollan

摘要

This paper reports on a preliminary study to examine the macroscopic effects of an applied magnetic field to the flow field around a NASA Orion CEV capsule geometry flying at a NASA Fire2 11,360 m/s reference flight condition. The CFD simulation predicts that a dipole magnetic field with \(B=0.78\)  T at the stagnation point produces a 10 times increase in shock stand-off and a Lorentz drag force equal to four times the non-MHD pressure drag force. Pressure drag is observed to reduce to 10% of its non-MHD magnitude, such that total drag increases to approximately three times the non-MHD value. Inspection of the flowfield for the MHD case indicates that separation occurs on the forebody which initiates a large recirculation region around the sides of the capsule which follows the direction of the magnetic field lines. The temperature is increased throughout the entire flow field around the capsule, which then results in an extensive region of subsonic flow extending far into the capsule wake. This suggests that a full CFD analysis of flow around the capsule and also its wake may be necessary even for simulations aiming only to resolve the forebody shock layer flow. Finally, it is observed that Hall parameter and Magnetic Reynolds number both greatly exceed 1, indicating that accurate CFD simulations of full scale flight vehicles at these conditions will need to account for both Hall effect and deformation of the applied magnetic field due to plasma flow through it.