Searched for: subject%3A%22particle%255C%2Bimage%255C%2Bvelocimetry%22
(1 - 20 of 113)

Pages

document
Wang, Fanglun (author)
The fundamental research of cavitation has been a hot topic for decades, while a particle image velocimetry (PIV) measurement on single bubble dynamics is uncommon due to many technical hassles. The involved flow field is small in space and highly unsteady in time, so it challenging the spatial and temporal resolution that current PIV techniques...
master thesis 2022
document
Grille Guerra, Adrian (author)
Unmanned aerial vehicles have proliferated in the last few decades, with applications that include military, commercial and recreational. Their size and typical flight velocities are characterized by moderate Reynolds numbers <i>O</i>(10^4-10^5). For such conditions, boundary layers can remain laminar and therefore are highly susceptible to...
master thesis 2022
document
Jux, C. (author)
Particle image velocimetry (PIV) is the state of the art for quantitative, full-field, 3D flow diagnostics. Despite the maturity of the technique, two bottlenecks are identified which are addressed in this thesis: the achievable measurement volume size, and the optical access to geometrically complex objects. Both aspects are well illustrated...
doctoral thesis 2022
document
Stuber, V.L. (author), Kotsonis, M. (author), van der Zwaag, S. (author)
Two piezoelectric series bimorph sensors were embedded below the skin of a NACA 0012 symmetrical airfoil to detect the local state of the boundary layer during wind tunnel testing. Small vanes piercing the airfoil skin were glued onto the bimorphs providing a mechanical coupling to the local mechanical force fluctuations imparted by the local...
journal article 2022
document
Jacobi, G. (author), Thill, C.H. (author), Huijsmans, R.H.M. (author)
The paper presents velocity measurements, using particle image velocimetry, as well as a reconstruction of hydrodynamic pressures for the analysis of fast ships. Stereoscopic PIV measurements with a towed underwater PIV system are conducted during towing tank tests to obtain the velocity field in the bow region of a fast ship at speeds up to...
journal article 2022
document
Chantriaux, François (author), Quenouille, Théo (author), Doan, Nguyen Anh Khoa (author), Swaminathan, Nedunchezhian (author), Hardalupas, Yannis (author), Taylor, A. M.K.P. (author)
Multi-scale analysis of turbulence-flame interaction is performed using experimental data sets from three methane- and propane-fired premixed, turbulent V-flames, at an approach flow turbulent Reynolds number of 450 and a ratio of r.m.s. fluctuating velocity from the mean to laminar flame speed of between 2.1 and 3.0, straddling the border...
journal article 2022
document
PATIL, YUGANDHAR VIJAYKUMAR (author)
Vertical Axis Wind Turbine (VAWT) operation is characterized by complex and unsteady three-dimensional fluid dynamics, which presents considerable challenges. One of the crucial points to understand is the complex interaction between rotor, inflow, and wake systems. If we can demonstrate its effectiveness in the complex flow/inflow conditions,...
master thesis 2021
document
Hartog, Friso (author)
Turbulent drag is the largest source of fuel consumption in aviation and forms a significant contribution to climate warming. Recent numerical studies have suggested the ability of surfaces with streamwise-preferential permeability to reduce turbulent friction, and a theoretical framework behind the working mechanism has been proposed. This work...
master thesis 2021
document
Arkesteijn, Joerie (author)
Following recent proof of swept wing laminar-to-turbulent boundary layer transition delay through base-flow modification using AC-DBD plasma actuators, an experimental investigation is performed to study the responsible physical mechanism. An experiment is conducted on a 45° swept wing in the anechoic wind tunnel at the Delft University of...
master thesis 2021
document
Bouman, Gijs (author)
In this thesis, the resistance of a single degree of freedom liner is investigated experimentally. Semi-empirical resistance modelling fails at higher Mach numbers (M<sub>0</sub>&gt;0.3) and sound pressure levels (SPL&gt;130dB), and experimental work is missing in these conditions. An experiment combining in-situ impedance measurements and phase...
master thesis 2021
document
van Voorden, Jeroen (author)
The design of current skating suits is based on the assumption that the flow across the skater body parts is highly similar to cylinder flow. The latter features drag crisis behaviour, resulting in significant drag reduction at the critical Reynolds number. However, whether the aforementioned assumption is valid and whether a drag crisis along...
master thesis 2021
document
Sciacchitano, A. (author), Arpino, F. (author), Cortellessa, G. (author)
We present an experimental benchmark database for the transitional cavity flow. The database is obtained by planar Particle Image Velocimetry measurements at the median plane of the cavity model, for Reynolds numbers between 6300 and 19,000 based on the cavity height. A detailed uncertainty analysis of the experimental results is performed...
journal article 2021
document
Bakker, W. (author), Hofland, B. (author), de Almeida Sousa, E. (author), Oldenziel, G. (author), Overmars, E.F.J. (author)
In this paper the development of a high-power pulsed LED line light and its use to apply particle image velocimetry (PIV) during wave impact measurements are described. An electrical circuit that generates high-current pulses is designed and built, which is used to overdrive a number of commercially available LEDs. The limit for this...
journal article 2021
document
Adatrao, S. (author), Bertone, M. (author), Sciacchitano, A. (author)
A novel approach is devised for the quantification of systematic uncertainty due to peak locking in particle image velocimetry (PIV), which also leads to correction of the peak-locking errors. The approach, applicable to statistical flow properties such as time-averaged velocity and Reynolds stresses, relies on image recordings with multiple...
journal article 2021
document
Voorneveld, J.D. (author), Keijzer, L.B.H. (author), Strachinaru, Mihai (author), Bowen, Daniel J. (author), Mutluer, Ferit O. (author), van der Steen, A.F.W. (author), Ten Cate, Folkert (author), de Jong, N. (author), Vos, H.J. (author), Van den Bosch, Annemien E. (author), Bosch, Johan G. (author)
High-frame-rate (HFR) echo-particle image velocimetry (echoPIV) is a promising tool for measuring intracardiac blood flow dynamics. In this study, we investigate the optimal ultrasound contrast agent (UCA: SonoVue) infusion rate and acoustic output to use for HFR echoPIV (PRF = 4900 Hz) in the left ventricle (LV) of patients. Three infusion...
journal article 2021
document
Scarano, F. (author), Jux, C. (author), Sciacchitano, A. (author)
The present work reviews the recent developments in the domain of particle image velocimetry (PIV) with attention to its use for large-scale problems of interest for industrial aerodynamics. The article introduces the fundamental principles of flow seeding for large-scale experiments based on the helium-filled soap bubble (HFSB) technique....
journal article 2021
document
LeBlanc, B.P. (author), Ferreira, Carlos (author)
This paper presents the flow fields and aerodynamic loading of a two bladed H-type vertical axis wind turbine with active variable pitch for load and circulation control. Particle Image Velocimetry is used to capture flow fields at six azimuthal positions of the blades during operation, three upwind and three downwind. Flow phenomena such as...
journal article 2021
document
Wu, X. (author), Gurzing, S.D. (author), Schinkel, C.V. (author), Toussaint, Merel (author), Perinajová, R. (author), van Ooij, Pim (author), Kenjeres, S. (author)
Introduction: Wall shear stress (WSS) is associated with the growth and rupture of an intracranial aneurysm. To reveal their underlying connections, many image-based computational fluid dynamics (CFD) studies have been conducted. However, the methodological validations using both in vivo medical imaging and in vitro optical flow measurements...
journal article 2021
document
Pazhev, Ventsislav (author)
Transverse jet injection into supersonic crossflows is encountered with Aerospace applications such as fuel injection in Supersonic Combustion Ramjet (SCRamjet) engines and reaction-jet-based attitude control systems. In particular, for the case of SCRamjets, the short residence times of the fuel in the combustion chamber can be countered by the...
master thesis 2020
document
Jacobi, G. (author)
As soon a ship operates at high forward speeds its weight is pre-dominantly supported by hydrodynamic, rather than hydrostatic forces. Small changes in the dynamic pressure distribution on the ship hull can have a significant influence on the ship’s running attitude in calm water, but also on its seakeeping performance. In order to further...
doctoral thesis 2020
Searched for: subject%3A%22particle%255C%2Bimage%255C%2Bvelocimetry%22
(1 - 20 of 113)

Pages