Numerical and Experimental Examination of Shock Control Bump Flow Physics

2012 ◽  
pp. 333-349 ◽  
Author(s):  
K. Nübler ◽  
S. P. Colliss ◽  
T. Lutz ◽  
H. Babinsky ◽  
E. Krämer
Keyword(s):  
Experimental Examination ◽  
Flow Physics ◽  
Shock Control Bump ◽  
Shock Control

scholarly journals Unsteady Simulation of Transonic Buffet of a Supercritical Airfoil with Shock Control Bump

Aerospace ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 203
Author(s):  
Yufei Zhang ◽  
Pu Yang ◽  
Runze Li ◽  
Haixin Chen
Keyword(s):  
Lift Coefficient ◽  
Pressure Coefficient ◽  
Flow Characteristics ◽  
Control Effect ◽  
Shock Control Bump ◽  
Shock Control ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Unsteady Simulation ◽  
Drag Ratio

The unsteady flow characteristics of a supercritical OAT15A airfoil with a shock control bump were numerically studied by a wall-modeled large eddy simulation. The numerical method was first validated by the buffet and nonbuffet cases of the baseline OAT15A airfoil. Both the pressure coefficient and velocity fluctuation coincided well with the experimental data. Then, four different shock control bumps were numerically tested. A bump of height h/c = 0.008 and location xB/c = 0.55 demonstrated a good buffet control effect. The lift-to-drag ratio of the buffet case was increased by 5.9%, and the root mean square of the lift coefficient fluctuation was decreased by 67.6%. Detailed time-averaged flow quantities and instantaneous flow fields were analyzed to demonstrate the flow phenomenon of the shock control bumps. The results demonstrate that an appropriate “λ” shockwave pattern caused by the bump is important for the flow control effect.

Robust active shock control bump design optimisation using hybrid parallel MOGA

2013 ◽  
Vol 80 ◽  
pp. 214-224 ◽  
Author(s):  
D.S. Lee ◽  
G. Bugeda ◽  
J. Periaux ◽  
E. Onate
Keyword(s):  
Design Optimisation ◽  
Shock Control Bump ◽  
Shock Control

Numerical analysis on shape memory alloy–based adaptive shock control bump

2018 ◽  
Vol 29 (15) ◽  
pp. 3055-3066 ◽  
Author(s):  
Lin Hao ◽  
Jinhao Qiu ◽  
Hongli Ji ◽  
Rui Nie
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Angle Of Attack ◽  
Aerodynamic Characteristics ◽  
Wave Drag ◽  
Initial Shape ◽  
Thermally Activated ◽  
Bump Height ◽  
Shock Control Bump ◽  
Shock Control

A three-dimensional adaptive shock control bump made of shape memory alloy is proposed for transonic wings. The methodology to adaptively change the configuration of the airfoil using the shape memory alloy bump to reduce the shock strength and wave drag is numerically demonstrated using an airfoil RAE2822. The shape memory alloy bump is trained to have a flat initial shape with certain initial strain and can swell up when thermally activated. Boyd–Lagoudas phenomenological model is implemented in finite element method and used to compute the two-dimensional profile and the height of the shape memory alloy bump during thermal activation. The results show that the shape memory alloy bump can generate a considerable deflection due to the reverse phase transformation when thermally activated. The dependence of aerodynamic characteristics of the wing on the height of the shape memory alloy bump and the angle of attack is investigated using computational fluid dynamics method. The results show that there is an optimal bump height for a given angle of attack and the bump with a given height is effective only in certain range of angle of attack. Optimization of bump height and the corresponding driving temperature are carried out under variable angles of attack with the lift-to-drag ratio as the objective function.

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