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Shock-wave surfing and the separation of meteoroid fragments in the atmosphere

Laurence, Stuart und Deiterding, Ralf (2010) Shock-wave surfing and the separation of meteoroid fragments in the atmosphere. 63rd Meeting of the APS Division of Fluid Dynamics, 21.-23. Nov. 2010, Long Beach, USA.

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Offizielle URL: http://meetings.aps.org/Meeting/DFD10/Event/133913

Kurzfassung

Studying the aerodynamic interactions between bodies travelling at highly supersonic speeds is necessary to our understanding of the separation of meteoroid fragments following atmospheric disruption. Here we show that a phenomenon referred to as "shock-wave surfing'', in which a body moves in such a way as to follow the shock wave generated by another upstream body, can lead to the accumulation of a significantly higher relative lateral velocity between fragments than would otherwise be possible. The surfing phenomenon is investigated for the canonical cases of interactions between a sphere and a wedge, and between two spheres. Numerical simulations are performed and a simple theoretical model is developed to determine the forces acting on the surfing body. A phase-plane description is employed to elucidate features of the system dynamics in both cases. For the two sphere case, a strong influence of the body radius ratio on the separation process is found and a critical ratio is predicted for initially touching fragments that delineates entrainment of the smaller fragment within the larger fragment's shock from expulsion. It is also shown that a large fraction of the variation in the separation behaviour of meteoroid fragments deduced by previous authors from an analysis of terrestrial crater fields can be explained by a combination of surfing and a modest rotation rate of the parent body.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Shock-wave surfing and the separation of meteoroid fragments in the atmosphere
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Laurence, Stuartstuart.laurence@dlr.de
Deiterding, RalfOak Ridge National Laboratories, Oak Ridge
Datum:2010
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:Vol. 55
Name der Reihe:Conference Proceedings
Status:veröffentlicht
Stichwörter:hypersonic flows, aerodynamic interactions, meteoroid fragmentation
Veranstaltungstitel:63rd Meeting of the APS Division of Fluid Dynamics
Veranstaltungsort:Long Beach, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:21.-23. Nov. 2010
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W RP - Raumtransport
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):W - Grundlagen Raumtransport - Anlagen und Messtechnik (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge
Hinterlegt von: Dagmar Brennecke-Hosseinzadeh
Hinterlegt am:21 Dez 2010 15:03
Letzte Änderung:21 Dez 2010 15:03

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