Effects of double-wedge aft angle on hypersonic laminar flows

A. S. Durna, B. Celik

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The aim of this study is to reveal the physics of low-enthalpy Mach 7 flows over double wedges that have varied aft angles and a fixed fore angle of 30°. Comparisons of the obtained numerical schlieren images along with the contours of Q criterion and surface heat fluxes assert that the influence of the vortical structures on the flow becomes more significant in accordance with the value of the aft angle. For the aft angle of θ2 < 50°, the three-dimensionality effects are negligible. As the aft angle exceeds 50°, the vortical structures that align in the streamwise direction start to emerge and strengthen over the surfaces of the aft wedge. The characteristic signs of Görtler vortices, distinct striations, also become apparent in the contours of heat flux, density gradient, and pressure on the surfaces of the aft wedge for those cases. The presence of vortical structures enhances heat transfer from the surfaces and together with relieving effects breaks the symmetry down in the flowfield. In general, the vortical structures and relieving effects that take place in the computations diversify the shock structure from those obtained from the two-dimensional computations for the cases with θ2 > 50°.

Original languageEnglish
Pages (from-to)1689-1703
Number of pages15
JournalAIAA Journal
Volume58
Issue number4
DOIs
Publication statusPublished - 2020

Bibliographical note

Publisher Copyright:
© 2019 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

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