Passive Flow Control over an Airfoil by Control Rod at Low Reynolds Number

doi:10.47176/jafm.13.06.31087

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Fortunately, the presence of parasitic drag offsets this good performance. A rod controlling the flow of an SD7062 airfoil was presented in the work of Durhasan [18], utilizing the particle image velocimetry (PIV) technique at pre-stall angles of attack at Reynolds number Re = 30000. The rod was inserted at several chord wise points on the suction surface of the airfoil.…”

Section: Aerodynamic Analysis Over a 2d Airfoilmentioning

confidence: 99%

Review of Improving the Performance of Horizontal Axis Wind Turbine Using Passive Flow Control

Ibrahim

2024

ERU Research Journal

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Controlling rotor blade flow separation and dynamic stall is required to improve the aerodynamic performance of horizontal axis wind turbine (HAWT) blades. Active and passive flow controls are the two basic methods for controlling the flow state. The use of passive and/or active flow management strategies to improve the aerodynamic performance of the blade is common. Many publications are currently being conducted to determine the impact of various passive and active strategies on the aerodynamics of blades. Active flow control is limited since it requires an extra controller, actuators, and power source to control the flow. Passive flow control, on the other hand, is more straightforward and less expensive. As a result, passive flow control is more beneficial in real-world applications, but only under certain conditions. Researchers are developing improved designs for HAWT blades, the main component of the turbine responsible for power generation. CFD is a versatile and powerful tool for simulating and analyzing airflow over wind turbines. It can provide detailed information about the flow field around the turbine, including velocity, pressure, and turbulence. This information can be used to understand the aerodynamic forces acting on the turbine and to identify areas for improvement. CFD has been used to develop a variety of design and optimization strategies for wind turbines, leading to significant improvements in aerodynamic performance.

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Section: Aerodynamic Analysis Over a 2d Airfoilmentioning

confidence: 99%

Review of Improving the Performance of Horizontal Axis Wind Turbine Using Passive Flow Control

Ibrahim

2024

ERU Research Journal

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“…Their experiments showed that for the optimum control rod configuration, the laminar separation bubble seemed to entirely vanish. With similar experimental approach, [7] has studied experimentally the laminar separation bubble flow mechanism at pre-stall regime for SD7062 aerofoil controlled by small rod of different diameters at Reynolds number of 3 × 10 4 placed on the suction side at various chordwise locations. The PIV results revealed significant reduction in the size of the laminar separation bubble for proper rod diameter and location, along with decrease in height of the boundary layer by 22% which is coherent with the correlated reduction of 34% in the eddies' turbulent energy in the flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of parietal pressure distribution on NACA0012 wing controlled by micro-cylindrical rod arranged in tandem

Larabi¹,

Pereira²,

Ravelet³

et al. 2023

PCFD

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The aim of this study is to investigate the influence of disturbed freestream flow by a small cylinder on the laminar separated boundary layer over NACA0012 wing operating at a Reynolds number of Re c = 4.45 × 10 5 . A detailed parametric investigations for the rod are performed using numerical simulations coupled with transition sensitive closure model (γ − Re θ,t ) seeking for the optimal passive control parameters. Firstly, the use of such steady RANS model has been successfully accurate in capturing the separation induced transition on the baseline wing suction surface. Secondly, the rod location was scaled according to the formation length of vortices behind the micro-cylinder for which the aerodynamic loads are very sensitive. The effects of three rod diameter ratios (d/c = 0.67%, 1.33% and 2%) on the laminar separation bubble and aerodynamic performances were examined. It was observed that the qualitative analysis of the flow structures revealed the mechanisms of the control device for the aerofoil performance improvements in which the rod wake exerted considerable effects on LSB size, pressure coefficient and flow streamlines. Particularly, it contributes to eliminate the boundary layer separation with pronounced decrease of 75% by energizing the shear layer over a significant extent, resulting in a mean drag dropping of 73% at 12 • incidence, and a lift enhancement of about 23% at 15 • .

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Neural network flow optimization using an oscillating cylinder

et al. 2023

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Flow behaviors of a downstream object can be affected significantly by an upstream object in close proximity. Combined with the neural network algorithms, this concept is used for flow control in this study to optimize the aerodynamic performance of a downstream object. Flow with an oscillating cylinder placed upstream is systematically studied because there are multiple control parameters that influence the flow dynamics around the downstream object. These control parameters are used as the input factors of a back-propagation neural network, and then a revised genetic algorithm is applied to find the optimal set of control parameters. In the current study, we use an airfoil in a low-Reynolds-number flow as an example to investigate the proposed neural network flow optimization concept. The datasets used to train the neural network are from the computational simulation with a previously validated immerse-boundary method to accommodate the motion of the cylinder. The results show that by optimally placing an upstream moving cylinder, it is possible to enhance the aerodynamic performance of the downstream object. Compared to the reference case, the optimized lift/drag ratio of the downstream airfoil can be achieved 2.4 times of its reference value, while maintaining a relatively high lift coefficient.

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Passive Flow Control over an Airfoil by Control Rod at Low Reynolds Number

Cited by 4 publications

References 25 publications

Review of Improving the Performance of Horizontal Axis Wind Turbine Using Passive Flow Control

Review of Improving the Performance of Horizontal Axis Wind Turbine Using Passive Flow Control

Numerical investigation of parietal pressure distribution on NACA0012 wing controlled by micro-cylindrical rod arranged in tandem

Neural network flow optimization using an oscillating cylinder

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