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SA0200018.pdf2.97 MB
titleTheoretical Consideration on Laminar-To-Turbulent Transitions over an Ablating Reentry Capsule
Author(jpn)小紫, 公也; Candler, Graham V.
Author(eng)Komurasaki, Kimiya; Candler, Graham V.
Author Affiliation(jpn)東京大学 工学部 航空宇宙工学科; Department of Aerospace Engineering and Mechanics, University of Minnesota
Author Affiliation(eng)Department of Aeronautics and Astronautics, University of Tokyo; Department of Aerospace Engineering and Mechanics, University of Minnesota
Issue Date2003-03
Institute of Space and Astronautical Science
Publication titleThe Institute of Space and Astronautical Science report. S.P.
Aerodynamics, Thermophysics, Thermal Protection, Flight System Analysis and Design of Asteroid Sample Return Capsule
Start page109
End page122
Publication date2003-03
AbstractThe mechanism of early transition phenomena over an ablating reentry capsule has been examined. A two-equation turbulence model (kappa-epsilon model) coupled with Reynolds averaged Navier-Stokes equations has been employed. Low-Reynolds-number effects on the solid wall were considered by modifying the Chien's correction. As a result, the transition occurred at lower Reynolds numbers with higher ablation rates. The predicted transition-point Reynolds number was 3 x 10(exp 4) at the surface-mass-injection rate of 100 g/sm(sup 2). The principal mechanism of this early transition is thought as follows; the viscosity damping effects are reduced and re-laminarization is prevented in the downstream of the capsule surface, due to the turbulence on the surface and due to the pushing out of near-surface stream-lines from the surface by successive mass injection.
Document TypeDepartmental Bulletin Paper
JAXA Category宇宙科学研究所

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