Aerospace | |
Emission Modes in Electrospray Thrusters Operating with High Conductivity Ionic Liquids | |
DanielQ. Eckhardt1  John Ziemer2  RichardE. Wirz3  NolanM. Uchizono3  PeterL. Wright3  Anirudh Thuppul3  AdamL. Collins3  | |
[1] Electric Propulsion Lead, In-Space Propulsion Branch (RQRS), Air Force Research Laboratory, Edwards AFB, CA 93524, USA;LISA Microthruster Technology Lead, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;Plasma & Space Propulsion Laboratory, UCLA Mechanical and Aerospace Engineering, 420 Westwood Plaza, Los Angeles, CA 90095, USA; | |
关键词: electrospray; ionic liquid; electric propulsion; lifetime; electrohydrodynamics; instabilities; | |
DOI : 10.3390/aerospace7100141 | |
来源: DOAJ |
【 摘 要 】
Electrospray thruster life and mission performance are strongly influenced by grid impingement, the extent of which can be correlated with emission modes that occur at steady-state extraction voltages, and thruster command transients. Most notably, we experimentally observed skewed cone-jet emission during steady-state electrospray thruster operation, which leads to the definition of an additional grid impingement mechanism that we termed “tilted emission”. Long distance microscopy was used in conjunction with high speed videography to observe the emission site of an electrospray thruster operating with an ionic liquid propellant (EMI-Im). During steady-state thruster operation, no unsteady electrohydrodynamic emission modes were observed, though the conical meniscus exhibited steady off-axis tilt of up to 15. Cone tilt angle was independent over a wide range of flow rates but proved strongly dependent on extraction voltage. For the geometry and propellant used, the optimal extraction voltage was near
【 授权许可】
Unknown