Searched for: faculty:"Aerospace%5C%2BEngineering"
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Schneiders, J.F.G. (author), Pröbsting, S. (author), Dwight, R.P. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
A method is proposed to determine the instantaneous pressure field from a single tomographic PIV velocity snapshot and is applied to a flat-plate turbulent boundary layer. The main concept behind the single-snapshot pressure evaluation method is to approximate the flow acceleration using the vorticity transport equation. The vorticity field...
journal article 2016
document
Schneiders, J.F.G. (author), Pröbsting, S. (author), Dwight, R.P. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
A method is proposed to determine the instantaneous pressure field from a single tomographic PIV velocity snapshot and is applied to a flat-plate turbulent boundary layer. The main concept behind the single-snapshot pressure evaluation method is to approximate the flow acceleration using the vorticity transport equation. The vorticity field...
journal article 2016
document
Schneiders, J.F.G. (author), Pröbsting, S. (author), Dwight, R.P. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
A method is proposed to determine the instantaneous pressure field from a single tomographic PIV velocity snapshot and is applied to a flat-plate turbulent boundary layer. The main concept behind the single-snapshot pressure evaluation method is to approximate the flow acceleration using the vorticity transport equation. The vorticity field...
journal article 2016
document
Gentile, V. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
conference paper 2015
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Deng, S. (author), Xiao, T. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)
A numerical investigation is performed to address the flexing effect on the propulsion performance of flapping wing particularly on the counter-flapping wings of the biplane configuration. A Reynolds number of 10,000 is considered in the present study which corresponds to the flight regime of most existing flapping wing micro air vehicles. The...
journal article 2015
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Percin, M. (author), Vanierschot, M. (author), Van Oudheusden, B.W. (author)
Annular jet flows are of practical interest in view of their occurrence in many industrial applications in the context of bluff-body combustors [1]. They feature different complex flow characteristics despite their simple geometry: a central recirculation zone (CRZ) as a result of flow separation behind the centerbody and an outer (between the...
conference paper 2015
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Blinde, P.L. (author), Gentile, V. (author), Van Oudheusden, B.W. (author), Schrijer, F.F.J. (author)
Quantification of mean and fluctuating surface loads is critical for the efficient design of aerospace structures. To measure surface pressure in experiments, wind tunnel models are typically equipped with pressure transducers, which offer high sampling rates and high sensitivity. In order to have a sufficient spatial sampling of the surface...
conference paper 2015
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Blinde, P.L. (author), Lynch, K.P. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author)
A tomographic four-pulse PIV system is used in a transonic axisymmetric base flow experiment at a nominal free stream Mach number of 0.7, with the objective to obtain flow acceleration and pressure data. The PIV system, consisting of two double-pulse lasers and twelve cameras, allows acquiring two velocity fields with time separations as small...
conference paper 2015
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Nati, A. (author), De Kat, R. (author), Scarano, F. (author), Van Oudheusden, B.W. (author)
The unsteady effect of a periodic pitching motion on the characteristic of a laminar separation bubble on the suction side of a SD7003 aerofoil is investigated by means of time-resolved planar and tomographic particle image velocimetry. The measurements provide information on the separation, transition and vortex roll-up onset as well as the...
journal article 2015
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Gentile, V. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
Stereoscopic Particle Image Velocimetry (PIV) was used to study the wake of an ogive-cylinder with after-body at a diameter-based Reynolds number ReD = 6.7 · 104. The vertical fluctuations reduced from a maximum of 0.18 U? in absence of rear-protrusion, up to 0.12 U? and 0.1 U? when the main-body to after- body diameter ratio d/D was increased...
conference paper 2015
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Groot, K.J. (author), Pinna, F. (author), Van Oudheusden, B.W. (author)
The modal streamwise BiGlobal stability approach introduces problems regarding the specification of in- and outflow boundary conditions (BCs). Several conditions linked to lower hierarchical stability frameworks are elaborated and are applied to a freestream and boundary layer flow. The former case is used to demonstrate the odd-even decoupling...
journal article 2015
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Giepman, R.H.M. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author)
This study investigates the effects of boundary layer transition on an oblique shock wave reflection. The Mach number was 1.7, the unit Reynolds number was 35 × 106 m?1, and the pressure ratio over the interaction was 1.35. Particle image velocimetry is used as the main flow diagnostics tool, supported by oil-flow and Schlieren visualizations....
journal article 2015
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Blinde, P.L. (author), Schrijer, F.F.J. (author), Powell, S.J. (author), Werner, R.M. (author), Van Oudheusden, B.W. (author)
A wind tunnel model containing a solid rocket motor was tested at Mach 2 to assess the feasibility of investigating the interaction between a hot plume and a high-speed outer stream. In addition to Schlieren visualisation, the feasibility of applying PIV was explored. Recorded particle images revealed that the hot plume scatters and reflects...
conference paper 2015
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Percin, M. (author), Van Oudheusden, B.W. (author)
Tomographic particle image velocimetry was used to explore the evolution of three-dimensional flow structures of revolving low-aspect-ratio flat plates in combination with force measurements at a Reynolds number of 10,000. Two motion kinematics are compared that result in the same terminal condition (revolution with constant angular velocity and...
journal article 2015
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Deng, S. (author), Percin, M. (author), Van Oudheusden, B. (author)
This study explores the flow structures and unsteady force generation mechanisms of a flapping-wing micro air vehicle ‘DelFly Micro’ in forward flight configuration. Stereoscopic Particle Image Velocimetry (Stereo-PIV) measurements were performed to acquire three dimensional flow fields in the wake. Six components of forces and moments were...
journal article 2015
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Noyon, T.A. (author), Tay, W.B. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)
A three-dimensional simulation of hovering flapping wings was performed using an immersed boundary method. This was done to investigate the effects of chordwise wing deformation on three important unsteady aerodynamic mechanisms found in flapping flight, namely Leading Edge Vortex (LEV) shedding, wake capture and clap and fling. A wing was...
conference paper 2014
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Tenaglia, A. (author), Persin, M. (author), Van Oudheusden, B.W. (author), Deng, S. (author), Remes, B. (author)
This paper addresses the unsteady aerodynamic mechanisms in the hovering flight of the DelFly II flapping-wing Micro Aerial Vehicle (MAV). Stereoscopic Particle Image Velocimetry (Stereo-PIV) were carried out around the wings at a high framing rate. Thrust-force was measured to investigate the relation between the vortex dynamics and the...
conference paper 2014
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Sun, Z. (author), Van Oudheusden, B.W. (author), Schrijer, F.F.J. (author), Scarano, F. (author)
The wake resulting from two micro ramps operating in a supersonic boundary layer at Ma = 2:0 is investigated by means of PIV. Two micro ramps are investigated with height of 60% and 80% of the undisturbed boundary layer with thickness of 5.2 mm. The measurement domain encompasses the range from 10 to 32 ramp heights downstream of the device. The...
conference paper 2013
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Deng, S. (author), Van Oudheusden, B.W. (author), Remes, B.D.W. (author), Persin, M. (author), Bijl, H. (author), Ruijsink, H.M. (author)
conference paper 2013
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Giepman, R.H.M. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author)
The effects of micro-ramp height and location on a shock induced separation bubble were quantified using planar particle image velocimetry measurements. Conditional averaging was used to show that the amount of separation is related to the momentum flux in the near-wall region (< 0.5?) of the incoming boundary layer. The momentum flux added to...
conference paper 2013
Searched for: faculty:"Aerospace%5C%2BEngineering"
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