Multidisciplinary Design and Verification of the HB Flatback Airfoil Family

Doosttalab, Mehdi; Frommann, Olaf

doi:10.2514/1.j057684

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…To reduce the drag, a number of TE flow control devices have been proposed in the past. [4][5][6] Given these characteristics, most of the FB airfoil profile studies to date have focused either on the aerodynamic/aeroacoustic performance of the profiles [6][7][8][9] or on the wake characteristics of the flow, [10][11][12][13][14] almost entirely at a ¼ 0 or low angles of attack (AoA). On the contrary, the separated flow over FB profiles has received limited attention up until now.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the three-dimensional flow past a flatback wind turbine airfoil at high angles of attack

Μανωλέσος

Papadakis

2021

Physics of Fluids

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Flatback airfoils are airfoils with a blunt trailing edge. They are currently commonly used in the inboard part of large wind turbine blades, as they offer a number of aerodynamic, structural, and aeroelastic benefits. However, the flow past them at high angles of attack (AoA) has received relatively little attention until now. This is important because they usually operate at high AoA at the inboard part of Wind Turbine blades. The present investigation uses Reynolds averaged Navier-Stokes (RANS) and hybrid RANS þ large eddy simulation predictions to analyze the flow in question. The numerical results are validated against previously published wind tunnel experiments. The analysis reveals that to successfully simulate this flow, the spanwise extent of the computational domain is crucial, more so than the selection of the modeling approach. Additionally, a low-drag regime observed at angles of attack before stall is identified and analyzed in detail. Finally, the complex interaction between the three-dimensional separated flow beyond maximum lift (stall cells) with the vortex shedding from the blunt trailing edge is revealed.

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Section: Introductionmentioning

confidence: 99%

Investigation of the three-dimensional flow past a flatback wind turbine airfoil at high angles of attack

Μανωλέσος

Papadakis

2021

Physics of Fluids

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“…One of the main fields of study in airfoil optimization has been performed on turbines where various tools are combined such as geometric parameterization, genetic algorithms, and CFD [22][23][24][25][26]. Another application for the combination of the aforementioned tools is the development of UAVs, which represents one of the most relevant emerging technologies of the last two decades.…”

Section: Introductionmentioning

confidence: 99%

Airfoil Lift Coefficient Optimization Using Genetic Algorithm and IGP Parameterization: Volume 1

Tejeda-del-Cueto,

Flores-Alfaro,

Toledo-Velázquez

et al. 2023

Aerospace

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The objective of this study is to develop a genetic algorithm that uses the IGP parameterization to increase the lift coefficient (CL) of three airfoils to be used on wings of unmanned aerial vehicles (UAVs). The geometry of three baseline airfoils was modified by developing a genetic algorithm that operates with the IGP parameterization and performs the aerodynamic analysis using XFOIL in the MATLAB environment. Subsequently, a numerical model was made for each baseline and optimized airfoil using a commercial computational fluid dynamics (CFD) code to analyze the behavior of the lift coefficient. An increase in the average CL was obtained for the Eppler 68, MH 70, and Wortmann FX 60-126 airfoils for angles of attack ranging from 0 to 10, obtaining increments of 17.243%, 14.967%, and 10.708%, respectively. Additionally, an average 5.027% uncertainty was obtained in lift coefficient calculations between XFOIL and CFD. The utility of the IGP method and genetic algorithms for parameterizing and optimizing airfoils was demonstrated. In addition, airfoils could be tailored for a specific UAV depending on the mission profile. Volume 2 of this study will include experimental data from wind tunnel.

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“…This reduces the adverse pressure gradient and as a consequence promotes aerodynamic performance improvement. Studies [14][15][16][17][18][19][20][21] have shown that the maximum achievable lift coefficient and lift curve slope could be enhanced by adopting the flatback airfoil concept. Furthermore, the sensitivity of the lift and drag characteristics to surface soiling effects is also reduced.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic and Acoustic Simulations of Thick Flatback Airfoils Employing High Order DES Methods

Bangga

Seel

Lutz

et al. 2022

Advcd Theory and Sims

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The results of high fidelity aerodynamic and acoustic computations of thick flatback airfoils are reported in the present paper. The studies are conducted on a flatback airfoil having a relative thickness of 30% with the blunt trailing edge thickness of 10% relative to chord. Delayed Detached‐Eddy Simulation (DDES) approaches in combination with high order (5th) flux discretization WENO (Weighted Essentially Non‐Oscillatory) and l2Roe$l^{2}Roe$ Riemann solver are employed. Two variants of the DES length scale calculation methods are compared. The results are validated against experimental data with good accuracy. The studies provide guideline on the mesh and turbulence modeling selection for flatback airfoil simulations. The results indicate that the wake breakdown is strongly influenced by the spanwise resolution of the mesh, which directly contributes to the prediction accuracy especially for drag force and noise emission. The Reynolds normal stress u′u′¯$\overline{u^{\prime }u^{\prime }}$ and the u′v′¯$\overline{u^{\prime }v^{\prime }}$ Reynolds stress component have the largest contributions on the mixing process, while the contribution of the u′w′¯$\overline{u^{\prime }w^{\prime }}$ component is minimal. Proper orthogonal decomposition is further performed to gain deeper insights into the wake characteristics.

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Multidisciplinary Design and Verification of the HB Flatback Airfoil Family

Cited by 5 publications

References 25 publications

Investigation of the three-dimensional flow past a flatback wind turbine airfoil at high angles of attack

Investigation of the three-dimensional flow past a flatback wind turbine airfoil at high angles of attack

Airfoil Lift Coefficient Optimization Using Genetic Algorithm and IGP Parameterization: Volume 1

Aerodynamic and Acoustic Simulations of Thick Flatback Airfoils Employing High Order DES Methods

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