A cone-flare at Mach 6 is prone to centrifugal instability (or Görtler instability) along its concave wall. We investigate perturbation amplification in the presence of random, upstream steady vortical disturbances using direct numerical simulations (DNS). Our calculations reveal that the flow field selectively amplifies perturbations resulting in periodic streamwise streaks with a given azimuthal wavelength. Amplification of these streaks causes significant base flow modifications, which can eventually lead to flow transition. We also investigate the effectiveness of distributed suction and its spatial location for attenuating the growth of these streaks. It is found that suction along the region of large curvature is more effective in controlling the growth of these perturbations, though satisfactory reduction in the growth is not observed in any of the suction locations considered.
|Original language||English (US)|
|Title of host publication||AIAA Aviation 2019 Forum|
|Publisher||American Institute of Aeronautics and Astronautics Inc, AIAA|
|Number of pages||14|
|State||Published - 2019|
|Event||AIAA Aviation 2019 Forum - Dallas, United States|
Duration: Jun 17 2019 → Jun 21 2019
|Name||AIAA Aviation 2019 Forum|
|Conference||AIAA Aviation 2019 Forum|
|Period||6/17/19 → 6/21/19|
Bibliographical noteFunding Information:
The authors would like to acknowledge the support of the Office of Naval Research, by grant numbers: N00014-16-1-2500 and N00014-19-1-2037. The views and conclusions expressed in this paper are those of the authors and should not be interpreting as representing those of the U.S. Government or other funding agencies. We would like to thank Drs. Ioannis Nompelis and Heath Johnson for their help with the paper.