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The multi-point optimization of shock control bump with constant-lift constraint enhanced with suction and blowing for a supercritical airfoil

Mazaheri, K ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10494-015-9671-8
  3. Abstract:
  4. Both shock control bump (SCB) and suction and blowing are flow control methods used to control the shock wave/boundary layer interaction (SWBLI) in order to reduce the resulting wave drag in transonic flows. A SCB uses a small local surface deformation to reduce the shock-wave strength, while suction decreases the boundary-layer thickness and blowing delays the flow separation. Here a multi-point optimization method under a constant-lift-coefficient constraint is used to find the optimum design of SCB and suction and blowing. These flow control methods are used separately or together on a RAE-2822 supercritical airfoil for a wide range of off-design transonic Mach numbers. The RANS flow equations are solved using Roe's averages scheme and a gradient-based adjoint algorithm is used to find the optimum location and shape of all devices. It is shown that the simultaneous application of blowing and SCB (hybrid blowing/SCB) improves the average aerodynamic efficiency at off-design conditions by 18.2 % in comparison with the clean airfoil, while this increase is only 16.9 % for the hybrid suction/SCB. We have also studied the SWBLI and how the optimization algorithm makes the flow wave structure and interactions of the shock wave with the boundary layer favorable
  5. Keywords:
  6. Blowing ; Multi-point adjoint optimization ; Shock control bump ; Shock wave ; Aerodynamics ; Airfoils ; Algorithms ; Blow molding ; Boundary layer flow ; Boundary layers ; Drag ; Drag reduction ; Flow control ; Flow separation ; Optimization ; Shock absorbers ; Adjoint optimizations ; Aerodynamic efficiency ; Boundary layer thickness ; Optimization algorithms ; Shock control ; Shock-wave/boundary layer interactions ; Suction ; Supercritical airfoils ; Shock waves
  7. Source: Flow, Turbulence and Combustion ; Volume 96, Issue 3 , 2016 , Pages 639-666 ; 13866184 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s10494-015-9671-8