- document
-
Analysis of the Boundary Layer on a Highly Flexible Wing Based on Infrared Thermography MeasurementsMertens, C. (author), Grille Guerra, A. (author), van Oudheusden, B.W. (author), Fehrs, Michael (author), Ritter, Markus R. (author)The effects of the wing skin distortion on the boundary layer of a highly flexible wing are analyzed in a wind tunnel experiment using infrared thermography measurements. Considerable differences in the boundary layer flow are observed when comparing the sections of the wing near the ribs, where the design shape of the wing is preserved, and...book chapter 2024
- document
-
Laguarda, L. (author), Hickel, S. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)Wall-resolved large-eddy simulations (LES) are performed to investigate Reynolds number effects in supersonic turbulent boundary layers (TBLs) at Mach 2.0. The resulting database covers more than a decade of friction Reynolds number Re<sub>τ</sub>, from 242 to 5554, which considerably extends the parameter range of current high-fidelity...journal article 2024
- document
-
van Campenhout, O.W.G. (author), van Nesselrooij, M. (author), Lin, Y. (author), Casacuberta Puig, J. (author), van Oudheusden, B.W. (author), Hickel, S. (author)Although several previous studies have reported a potential drag-reducing effect of dimpled surfaces in turbulent boundary layers, there is a lack of replicability across experiments performed by different research groups. To contribute to the dialogue, we scrutinize one of the most studied dimple geometries reported in the literature, which...journal article 2023
- document
-
D'Aguanno, A. (author), Quesada Allerhand, P. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)In this experimental study, panel flutter induced by an impinging oblique shockwave is investigated at a freestream Mach number of 2, using the combination of planar particle image velocimetry (PIV) and stereographic digital image correlation (DIC) to obtain simultaneous full-field structural displacement and flow velocity measurements. High...journal article 2023
- document
-
Grille Guerra, A. (author), Mertens, C. (author), Little, Jesse C. (author), van Oudheusden, B.W. (author)The laminar separation bubble (LSB) that forms on the suction side of a modified NACA 64 <sub>3</sub>-618 airfoil at a chord-based Reynolds number of Re = 200 , 000 is studied using wind tunnel experiments. First, the LSB is characterized over a range of static angles of attack, in terms of the locations of separation, transition and...journal article 2023
- document
-
Mertens, C. (author), Fernández, José L.Costa (author), Sodja, J. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author)The aeroelastic response of the Delft-Pazy wing to steady and periodic unsteady inflow conditions is analyzed experimentally. The Delft-Pazy wing is a highly flexible wing model based on the benchmark Pazy wing (Avin, O., Raveh, D. E., Drachinsky, A., Ben-Shmuel, Y., and Tur, M., “Experimental Aeroelastic Benchmark of a Very Flexible Wing,”...journal article 2023
- document
-
D'Aguanno, A. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)This experimental study investigates the use of shock control bumps (SCBs) for controlling transonic buffet. Threedimensional SCBs have been applied on the suction side of an OAT15A supercritical airfoil with the experiments conducted in the transonic–supersonic wind tunnel of Delft University of Technology at fully developed buffet...journal article 2023
- document
-
Laguarda, L. (author), Hickel, S. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)Wall-resolved large-eddy simulations (LES) are carried out to investigate the aeroelastic coupling between a Mach 2.0 impinging shock-wave/turbulent boundary-layer interaction (STBLI) and a flexible thin-panel. After the initial transient, the panel exhibits self-sustained oscillatory behavior with varying oscillation amplitude, confirming the...conference paper 2023
- document
-
Dacome, G. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)The current study considers the configuration of a transverse jet in a supersonic crossflow that is interacting with an impinging oblique shock wave. The relevance of this configuration is associated to high-speed air-breathing propulsion systems, where a shock may be induced in the combustion chamber to enhance mixing. To investigate the...conference paper 2022
- document
-
Mertens, C. (author), Sodja, J. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author)The aeroelastic response of a very flexible wing in steady and unsteady inflow conditions is measured in a wind tunnel experiment. An integrated aeroelastic characterization is performed with a non-intrusive optical setup that allows simultaneous measurements of the structural motion and the flow field around the wing. The experimental...conference paper 2022
- document
-
D'Aguanno, A. (author), Camps Pons, C. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)In this study the effect of wing sweep on transonic buffet is studied experimentally to reveal the differences between two-dimensional (2D) and three-dimensional (3D) wing configurations. Background oriented schlieren (BOS) and stereographic particle image velocimetry (PIV) have been used as measurement techniques, performing experiments on: an...conference paper 2022
- document
-
Carrillo Córcoles, X. (author), Mertens, C. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author), De Breuker, R. (author), Sodja, J. (author)An aeroelastic wind tunnel experiment to identify the influence of the wing stiffness and hinge release threshold on the gust load alleviation performance of a folding wingtip design is presented in this study. Five models with different stiffness and tailoring properties are tested and the wing root bending moment at different conditions is...conference paper 2022
- document
-
Mertens, C. (author), de Rojas Cordero, T. (author), Sodja, J. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author)The aerodynamic, elastic, and inertial components in Collar’s triangle of forces acting on a flexible wing with span width s=1.75 m and chord c=0.25 m are determined based on integrated optical measurements of the structural and aerodynamic response to steady and unsteady periodic inflow conditions at a chord-based Reynolds number of 2.3×105....journal article 2022
- document
-
Van Veen, Wouter G. (author), Van Leeuwen, Johan L. (author), van Oudheusden, B.W. (author), Muijres, Florian T. (author)To generate aerodynamic forces required for flight, two-winged insects (Diptera) move their wings back and forth at high wing-beat frequencies. This results in exceptionally high wing-stroke accelerations, and consequently relatively high acceleration-dependent fluid forces. Quasi-steady fluid force models have reasonable success in relating...journal article 2022
- document
-
Wang, S. (author), Olejnik, D.A. (author), de Wagter, C. (author), van Oudheusden, B.W. (author), de Croon, G.C.H.E. (author), Hamaza, S. (author)Flyers in nature equip different airflow sensing mechanisms to navigate through wind disturbances with remarkable flight stability. Embracing bio-inspiration, airflow sensing with conventional sensors has long been utilized in flight control for larger micro air vehicles (MAVs). Bio-inspired flapping wing MAVs (FWMAVs) have extremely limited...journal article 2022
- document
-
van Nesselrooij, M. (author), van Campenhout, O.W.G. (author), van Oudheusden, B.W. (author), Schrijer, F.F.J. (author), Veldhuis, L.L.M. (author)Accurately measuring small changes in aerodynamic drag over a flat surface stands at the core of the development of technologies capable of reducing turbulent friction drag. A wind tunnel drag measurement system was developed which improves significantly on the state of the art. Experimental tests demonstrated that an uncertainty of less than...journal article 2022
- document
-
Hu, W. (author), Hickel, S. (author), van Oudheusden, B.W. (author)The flow over a forward-facing〉 step (FFS) at Ma<sub>∞</sub> = 1.7 and Re<sub>δ0</sub> = 1.3718 × 10<sup>4</sup> is investigated by well-resolved large-eddy simulation. To investigate effects of upstream flow structures and turbulence on the low-frequency dynamics of the shock wave/boundary layer interaction (SWBLI), two cases are considered:...journal article 2022
- document
-
D'Aguanno, A. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)This study experimentally investigates the effects of the sweep angle and finite wing on transonic buffet, studying two-dimensional (2-D) and three-dimensional wing configurations. Background-oriented schlieren and stereographic particle image velocimetry (PIV) have been used as measurement techniques, performing experiments on an OAT15A airfoil...journal article 2022
- document
-
Laguarda, L. (author), Hickel, S. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)We investigate Reynolds number effects in shockwave/turbulent boundary-layer interactions (STBLI) with strong mean flow separation. Three wall-resolved large-eddy simulations (LES) are performed for this purpose, with different Reynolds number but otherwise equal flow parameters and simulation setup. The resulting LES data covers more than a...conference paper 2022
- document
-
D'Aguanno, A. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)This experimental study investigates the possibility of controlling transonic buffet by means of a trailing edge flap with an upward deflection (referred to as “upper trailing edge flap”, or: UTEF). Different geometries (straight and serrated) and dimensions of UTEFs (with heights ranging between 1 and 2% of the chord) have been studied with...journal article 2022