Eliminating Boundary Layer Separation on a Cylinder with Non-Uniform Suction

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dc.contributor.authorRamsay J
dc.contributor.authorSellier M
dc.contributor.authorHo WH
dc.date.accessioned2020-10-04T20:53:26Z
dc.date.available2020-10-04T20:53:26Z
dc.date.issued2020en
dc.date.updated2020-07-28T22:32:34Z
dc.description.abstractBoundary layer separation negatively influences the performance of aerospace vehicles, for example, by triggering static stall or reducing combustion engine efficiency. Developing effective flow control to delay or eliminate separation is therefore of real use to the field. In this paper, numerical studies were carried out to optimise distributed suction profiles for preventing boundary layer separation on a circular cylinder in the fully laminar regime (Re < 188), with the least control effort. Relationships were found between the Reynolds number, the separation angle of the uncontrolled case, and the uniform suction needed to eliminate separation. It was found that for Re > 20, the uniform suction required to eliminate separation followed a quadratic profile, as a function of Re. Maximum uniform suction effort was needed at Re = 20, requiring a suction coefficient of CQ = 49:14 (as a percentage of the free-stream velocity) to eliminate separation. To resolve the best nonuniform suction profile at Re = 180, a variety of optimisation studies were performed using the coordinate search method. It was determined that the use of six control segments on each half of the cylinder provided the best control and efficient convergence to the optimal solution. 6- segment nonuniform suction eliminated separation at Re = 180 with net suction effort of CQ = 13:26 compared to CQ = 31:25 for the uniform case. These optimal suction profiles were compared using time-dependent simulations to confirm that both methods eliminate separation when introduced to an already unsteady case. Nonuniform suction eliminated separation faster, though uniform suction was more stable.en
dc.identifier.citationRamsay J, Sellier M, Ho WH (2020). Eliminating Boundary Layer Separation on a Cylinder with Non-Uniform Suction. International Journal of Aerospace Engineering. In press.en
dc.identifier.urihttps://hdl.handle.net/10092/101103
dc.language.isoen
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subject.anzsrcFields of Research::40 - Engineering::4012 - Fluid mechanics and thermal engineering::401201 - Aerodynamics (excl. hypersonic aerodynamics)en
dc.subject.anzsrcFields of Research::40 - Engineering::4012 - Fluid mechanics and thermal engineering::401204 - Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)en
dc.subject.anzsrcFields of Research::40 - Engineering::4001 - Aerospace engineering::400103 - Aircraft performance and flight control systemsen
dc.titleEliminating Boundary Layer Separation on a Cylinder with Non-Uniform Suctionen
dc.typeJournal Articleen
uc.collegeFaculty of Engineering
uc.departmentMechanical Engineering
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