Abstract
We investigate the effects of compressibility and wall cooling on the stationary, viscous (Type II) instability mode within the 3D boundary layer over rotating cones with half-angle greater than 40∘ . The stationary mode is characterised by zero shear stress at the wall and a triple-deck solution is presented in the isothermal case. Asymptotic solutions are obtained which describe the structure of the wavenumber and the orientation of this mode as a function of local Mach number. It is found that a stationary mode is possible only over a finite range of local Mach number. Our conclusions are entirely consistent with the results of Seddougui 1990 , A nonlinear investigation of the stability models of instability of the trhee-dimensional Compresible boundary layer due to a rotating disc Q. J. Mech. Appl. Math. , 43, pt. 4. It is suggested that wall cooling has a significant stabilising effect, while reducing the half-angle is marginally destabilising. Solutions are presented for air.
Original language | English |
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Pages (from-to) | 940–960 |
Number of pages | 20 |
Journal | IMA Journal of Applied Mathematics |
Volume | 81 |
Issue number | 5 |
Early online date | 29 Aug 2016 |
DOIs | |
Publication status | Published - 1 Oct 2016 |
Bibliographical note
© The author 2016. Published by Oxford University Press on behalf of the Institute of Mathematics and its Applications. All rights reserved. This is a pre-copyedited, author-produced version of an article accepted for publication in IMA Journal of Applied Mathematics following peer review. The version of record is available online at: https://doi.org/10.1093/imamat/hxw041Funding Information:
Engineering and Physical Sciences Research Council (grant EP/G061637/1 to S.J.G. and P.D.T.); Royal Academy of Engineering and the Leverhulme Trust (LSRF1415/11/29 to S.J.G and P.T.G.).
Keywords
- Rotating cone
- Type II
- Compressible boundary-layer flow