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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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