Spherical collectors versus bare tethers for drag, thrust, and power generation

Sanmartín Losada, Juan Ramón y Lorenzini, Enrico C. (2006). Spherical collectors versus bare tethers for drag, thrust, and power generation. "IEEE Transactions on plasma science", v. 34 (n. 5); pp. 2133-2139. ISSN 0093-3813.

Descripción

Título: Spherical collectors versus bare tethers for drag, thrust, and power generation
Autor/es:
  • Sanmartín Losada, Juan Ramón
  • Lorenzini, Enrico C.
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on plasma science
Fecha: 2006
Volumen: 34
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

Texto completo

[img]
Vista Previa
Pdf - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (275kB) | Vista Previa

Resumen

Deorbit, power generation, and thrusting performances of a bare thin-tape tether and an insulated tether with a spherical electron collector are compared for typical conditions in low-Earth orbit and common values of length L = 4−20 km and cross-sectional area of the tether A = 1−5 mm2. The relative performance of moderately large spheres, as compared with bare tapes, improves but still lags as one moves from deorbiting to power generation and to thrusting: Maximum drag in deorbiting requires maximum current and, thus, fully reflects on anodic collection capability, whereas extracting power at a load or using a supply to push current against the motional field requires reduced currents. The relative performance also improves as one moves to smaller A, which makes the sphere approach the limiting short-circuit current, and at greater L, with the higher bias only affecting moderately the already large bare-tape current. For a 4-m-diameter sphere, relative performances range from 0.09 sphere-to-bare tether drag ratio for L = 4 km and A = 5 mm2 to 0.82 thrust–efficiency ratio for L = 20 km and A = 1 mm2. Extremely large spheres collecting the short-circuit current at zero bias at daytime (diameters being about 14 m for A = 1 mm2 and 31 m for A = 5 mm2) barely outperform the bare tape for L = 4 km and are still outperformed by the bare tape for L = 20 km in both deorbiting and power generation; these large spheres perform like the bare tape in thrusting. In no case was sphere or sphere-related hardware taken into account in evaluating system mass, which would have reduced the sphere performances even further.

Más información

ID de Registro: 21740
Identificador DC: http://oa.upm.es/21740/
Identificador OAI: oai:oa.upm.es:21740
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 22 Nov 2013 10:56
Ultima Modificación: 21 Abr 2016 12:28
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM