Aerodynamic Load Control for Multi-Element Airfoils Using Surface-Normal Trailing-Edge Blowing

Hosseini, Seyedeh Sheida; Dam, C. P. van; Pandya, Shishir A.

doi:10.2514/1.c035248

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…(1) The active flow separation control requires additional energy for the boundary layer control, such as boundary layer blowing and suction [4][5][6][7] and synthetic jets [8][9][10], which can operate in two ways: (i) in an open-loop where the injection or suction of fluid is independent of the state or conditions of the flow such as wind speed and angle of attack (along the wingspan); (ii) in closed-loop, where the information is obtained from the sensors to control the rate of fluid injection/aspiration or to disable the control system in operating conditions where the flow is attached. Here we must mention that the open-loop or closedloop methods are applicable for all active control methods [11], plasma actuators [12], and so on.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

et al. 2022

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In this paper, we explore the improvement of the aerodynamic characteristics of wind turbine blades under stall conditions using passive flow control with slots. The National Renewable Energy Laboratory (NREL) Phase II rotor, for which detailed simulations and experimental data are available, served as a baseline for assessing the flow control system effects. The position and configuration of the slot used as a flow control system were determined using CFD analysis. The 3D-RANS equations are solved with ANSYS FLUENT using the k-ω SST turbulence closure model. The pressure coefficient for different wind speeds for the baseline configuration is compared to the available experimental data. The comparison shows that CFD results were better for the attached flow. The current work consists of a 3-D CFD modeling of a rotating blade equipped with different flow control systems: single-slot (S-S) and two-slots (T-S). The computation provides a better understanding of the influence of these flow control devices on the performance of wind turbine blades, the control of boundary layer separation, and the rotation effect. These control systems increase the power output by over 60% at high wind speeds with large separated boundary layer regions. For the configuration with the control system, the slot has shown its ability to delay the boundary layer separation. However, the improved aerodynamic performance has been proven for medium and high angles of attack where the flow is generally in the stall condition. The addition of the second slot changed the flow behavior, and an improvement was observed compared to the single slot configuration. The results are helpful for the design and development of a new generation of wind turbine blades.

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

et al. 2022

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“…Chan conducted overset grid quality diagnostics, 20 and Quon used radial basis functions (RBFs) to avoid the influence of orphan points on the simulation 21 . Studies on overset applications have focused on the automatic generation of grids for complex structural surfaces 22 , active flow control, 23 rotor hub, 24 wind farm simulation 25 , and the fluid structure coupling problem 26 . In addition, grid‐preprocessing software such as Pointwise, commercial solvers such as Starccm+ and Fluent, and postprocessing software such as Tecplot all currently support overset grids.…”

Section: Introductionmentioning

confidence: 99%

A robust overset assembly method for multiple overlapping bodies

Shi

2020

Numerical Methods in Fluids

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Summary A robust overset assembly method allowing for multiple overlapping bodies is presented. This method extends the overset assembly method to deal with the interference between objects and prevents the failure of the search for donor cells due to the complex shape of the models. The donor cells are searched before identifying the boundary of the chimera interpolation. By selecting interpolation cells only in areas with donor cells, the final overset interpolation boundary cells can always find their donor cells, which prevents orphan points and achieves excellent robustness. First, the implementation of the proposed assembly method is described in detail. Subsequently, the usability and efficiency of the method are verified using several cases. Finally, the integration strategy of the computational fluid dynamics solver based on overset interpolation with the modification of the boundary type is described and verified using practical cases with overlapping bodies. The results demonstrate the applicability of the proposed overset grid assembly method.

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Microjet Configuration Sensitivities for Active Flow Control on Multi-Element High-Lift Systems

Hosseini

Cooperman

Dam

et al. 2021

Journal of Aircraft

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Aerodynamic Load Control for Multi-Element Airfoils Using Surface-Normal Trailing-Edge Blowing

Cited by 13 publications

References 34 publications

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

A robust overset assembly method for multiple overlapping bodies

Microjet Configuration Sensitivities for Active Flow Control on Multi-Element High-Lift Systems

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