Pressure Gradient Effects on Supersonic Transition over Axisymmetric Bodies at Incidence

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Pressure Gradient Effects on Supersonic Transition over Axisymmetric Bodies at Incidence

Tokugawa, Naoko / Choudhari, Meelan / Ishikawa, Hiroaki / Ueda, Yoshine / Fujii, Keisuke / Atobe, Takashi / Li, Fei / Chang, Chau-Lyan / White, Jeffery

Abstract

Boundary-layer transition on axisymmetric bodies at a nonzero angle of attack in Mach 2 supersonic flow was investigated using experimental measurements and linear stability analysis. Transition over four axisymmetric bodies (namely, the Sears–Haack body, the semi-Sears–Haack body, the straight cone, and the flared cone) with different axial pressure gradients was measured in two different facilities with different unit Reynolds numbers. The semi-Sears–Haack body and flared cone were designed specifically to achieve a broader range of axial pressure distributions. Measurements revealed a dramatic effect of body shape on transition behavior near the leeward plane of symmetry. For a body shape with an adverse pressure gradient (that is, a flared cone), the measured transition patterns show an earlier transition location along the leeward symmetry plane in comparison with the neighboring azimuthal locations. For a nearly zero pressure gradient (that is, the straight cone), such leeward-first transition is observed only at the larger unit Reynolds number. Finally, transition occurs farther downstream along the leeward plane for the remaining two body shapes with a favorable pressure gradient. The observed transition patterns are partially consistent with the numerical predictions based on linear stability analysis.

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Document information

Title :

Pressure Gradient Effects on Supersonic Transition over Axisymmetric Bodies at Incidence

Contributors:

Tokugawa, Naoko (author) / Choudhari, Meelan (author) / Ishikawa, Hiroaki (author) / Ueda, Yoshine (author) / Fujii, Keisuke (author) / Atobe, Takashi (author) / Li, Fei (author) / Chang, Chau-Lyan (author) / White, Jeffery (author)

Published in:

AIAA Journal ; 53 , 12 ; 3737-3751

Publication date :

2015-09-03

Size :

15 pages

ISSN :

0001-1452 , 1533-385X

DOI :

https://doi.org/10.2514/1.J054070

Type of media :

Article (Journal)