Yakut Cansev Küçükosman

Von Karman Institute for Fluid Dynamics

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Christophe Schram

Von Karman Institute for Fluid Dynamics

Sophia Buckingham

Von Karman Institute for Fluid Dynamics

Agustín Villa Ortiz

Universidad Rey Juan Carlos

Federico Bariselli

Politecnico di Milano

Julien Christophe

Von Karman Institute for Fluid Dynamics

Giacomo Alessi

Von Karman Institute for Fluid Dynamics

Jeroen van Beeck

Von Karman Institute for Fluid Dynamics

Charline Fouchier

Von Karman Institute for Fluid Dynamics

Marco Virgilio

University of Southampton

Orkun Temel

Royal Observatory of Belgium

Cooperative Institutions

Von Karman Institute for Fluid Dynamics

KU Leuven

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Université Libre de Bruxelles

Vrije Universiteit Brussel

Delft University of Technology

Centre National de la Recherche Scientifique

University of Birmingham

Laboratoire de Dynamique des Fluides

Université Paris-Saclay

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

A remote microphone technique for aeroacoustic measurements in large wind tunnels

Applied Acoustics (2017)

Yakut Cansev Küçükosman Christophe Schram Jeroen van Beeck

The present study was devoted to the development and application of a remote microphone technique for aeroacoustic measurements in large aerodynamic wind tunnels. In this technique, the microphone and its connecting line to the sensing port are fitted within an aerodynamically streamlined fairing. A model-based calibration method was applied to account for the phase lag and dissipation within the microphone connecting line. The proposed system permits to carry out acoustic measurements when the wind tunnel surface cannot be altered, since the fairing can be simply glued on the wall. The fairing is streamlined to minimize flow disturbances as well as the risk of separation which would otherwise contaminate the wind tunnel flow quality and acoustic measurements. It was furthermore hoped that the acceleration of the flow over the fairing surface might reduce the turbulence fluctuations and thereby increase the signal-to-noise ratio of the acoustic measurements. Those aerodynamic effects were investigated with a set of hot-wire measurements performed in the subsonic L2B small wind tunnel of von Karman Institute (VKI). The mean velocity and the turbulence intensity profile were analyzed in the presence of different inflow turbulence characteristics at 5, 10 and 15 m/s freestream velocity. The effect of incident turbulence on the acoustic measurement was investigated applying the calibration procedure and comparing the measurements with a wall-mounted reference microphone signal in similar flow conditions. The results indicate that the wished beneficial effects of the flow acceleration are not significant. As an application, this technique is used to measure the noise emitted from the contra-rotating fans of the large L1 subsonic wind tunnel of the von Karman Institute, where the microphone fairing is placed inside the diffuser and thus subjected to a thick turbulent boundary layer. The results indicate that in spite of the mitigated turbulence-reduction performance of the fairing, it provides a measurement solution that is suitable for large wind tunnels provided the signals are compensated using the measured dynamic calibration. While it should be stressed that the calibration procedure itself is not new, the originality of the present paper stands in the proposed fairing design, and in the aerodynamic/acoustic investigation of its effect on the flow.

Freestream

10.1016/j.apacoust.2017.08.018

Cite

Citations (6)

Trailing edge noise prediction based on wall pressure spectrum models for NACA0012 airfoil

Journal of Wind Engineering and Industrial Aerodynamics (2018)

Yakut Cansev Küçükosman Julien Christophe Christophe Schram

Trailing edge

10.1016/j.jweia.2018.01.030

Cite

Citations (15)

Wind turbine aerofoils: a mesh dependency study

Giulio Vita Yakut Cansev Küçükosman Hassan Hemida Christophe Schram Jeroen van Beeck

Source

Cite

Citations (0)

Review of the VKI Doctoral Research 2015-2016

von Karman Institute for Fluid Dynamics eBooks (2016)

Alejandro Alvarez Laguna Gilles Bailet Federico Bariselli Georgios Bellas Chatzigeorgis A. Bellemans

10.35294/phdbook_2015-2016

Cite

Citations (0)

Wall Pressure Signature in Compressible Turbulent Boundary Layers

ERCOFTAC series (2015)

Nicolas Buchmann Yakut Cansev Küçükosman Klaus Ehrenfried Christian J. Kähler

Compressible flow

10.1007/978-3-319-20388-1_8

Cite

Citations (11)

Semi-analytical approaches for the prediction of the noise produced by ducted wind turbines

Yakut Cansev Küçükosman

The integration of wind turbines into urban environments is a challenging task due to the reduced wind speed and high turbulence levels caused by the surface resistance, as well as limited spacing. If a specific building arrangement is explored, an improve ment in wind speed can be obtained. This would be especially beneficial for tall build ings where a wind turbine can be placed on the roof, side, or through a duct. However, the main problem associated with the integration of wind turbines is the acoustic an noyance. Therefore, the focus of this thesis is twofold. First, a robust, accurate, and low computational cost numerical methodology is proposed to predict the trailing edge noise for a ducted wind turbine. Second, a measurement device is developed to acquire noise emitted by a rotating machine where the duct surface cannot be altered. An inves tigation of the incoming flow on the noise emitted by a building-integrated wind turbine is conducted by different aerodynamic roughness lengths…

10.4233/uuid:b749675c-edb1-4355-ba09-bf46278077d0

Cite

Citations (3)

RANS-based trailing-edge noise prediction using Amiets theory: accuracy and mesh sensitivity of semi-empirical and integral wall pressure models

AIAA/CEAS Aeroacoustics Conference (2018)

Yakut Cansev Küçükosman Julien Christophe Christophe Schram

Trailing edge

10.2514/6.2018-3793

Cite

Citations (0)

Numerical simulations of the vibro-acoustic response of a flexible panel subjected to a Mach 2 turbulent boundary layer

AIAA SCITECH 2022 Forum (2020)

Sophie Le Bras Korcan Kücükcoskun Guillaume Grossir Yakut Cansev Küçükosman Christophe Schram

A numerical study of the vibro-acoustic response of a flexible panel excited by a supersonic turbulent boundary layer is presented. The objectives are to provide guidelines for a test rig that is currently being designed at the von Karman Institute for Fluid Dynamics, and to constitute a first validation database supporting the commissioning of that new facility. The focus is placed on the characterization of the properties of the turbulent boundary layer wall-pressure fluctuations and on the prediction of the sound levels produced by the vibrations of the flexible panel. The wall-pressure loads are determined from semi-empirical models using mean flow parameters obtained from a Reynolds-Averaged Navier-Stokes simulation. The vibro-acoustic response of the panel is then estimated from the flow-induced loads using two numerical approaches implemented in a frequency-domain finite-element framework. The first approach consists of a Cholesky decomposition of the cross-spectral matrix of the flow-induced wall pressure fluctuations. In the second approach, the matrix decomposition is carried out in the wavenumber space using a sum of uncorrelated plane waves in order to synthesize the wall-pressure loads. The performances of these two numerical methods are examined by simulating the response of a cavity-plate system already studied in the literature. The two methods are then applied to the cavity-plate configuration foreseen for the future test rig. In particular, the effects of the choice of the semi-empirical models, the flow parameters and the plate thickness are discussed.

10.2514/6.2020-0569

Cite

Citations (2)

Full-scale simulation and analysis of formation flight during in-air-capturing of a winged reusable launch vehicle

Journal of Space Safety Engineering (2022)

Sunayna Singh Sven Stappert Leonid Bussler Martin Sippel Yakut Cansev Küçükosman

10.1016/j.jsse.2022.09.005

Cite

Citations (6)

Experimental Characterization of Flow Through Porous Fairings

AIAA Aviation 2019 Forum (2023)

Erica Gallo Riccardo Zamponi Alessandro Zarri Yakut Cansev Küçükosman Christophe Schram

View Video Presentation: https://doi.org/10.2514/6.2023-4175.vid This study focuses on the characterization of turbulent flows generated downstream of simplified flow-permeable fairings, which represent a novel landing gear noise-control strategy. Permeable fairings can affect the turbulent flow separation and related noise of landing gear elements by reducing the local velocity and injecting turbulence in order to perturb the large-scale vortex shedding. Although promising noise reduction is achieved with this technology, the involved physical mechanisms are still unclear. A detailed characterization of the flow field induced by those fairings is necessary and constitutes the main purpose of this work. To this end, a permeable wire mesh and more resistive fairings, such as a plate with straight circular perforations and an innovative diamond-lattice cells-based fairing, have been tested in the WAABLIEF low-speed acoustic wind tunnel of the von Karman Institute for Fluid Dynamics. Mean velocity profiles and turbulence statistics of the flow field have been determined by means of hot-wire anemometry and stereoscopic particle image velocimetry. Furthermore, to gain a thorough understating of the turbulence characteristics induced by the presence of the fairings, time- and frequency-domain data analyses have been carried out. The results show that the flow generated downstream of the standard wire mesh is characterized by adequate homogeneity and isotropy with respect to the perforated plate and the diamond-lattice fairing at the same inlet velocity. However, the more resistive fairings offer strong velocity reduction, which can result in beneficial effects from an acoustic point of view. The experimental dataset will permit fine-tuning and validating numerical simulations.

Kármán vortex street

Wake turbulence

10.2514/6.2023-4175

Cite

Citations (2)