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Daniele Ragni
Researcher at Delft University of Technology
Publications - 208
Citations - 3618
Daniele Ragni is an academic researcher from Delft University of Technology. The author has contributed to research in topics: Boundary layer & Airfoil. The author has an hindex of 26, co-authored 158 publications receiving 2458 citations.
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Near wake flow analysis of a vertical axis wind turbine by stereoscopic particle image velocimetry
TL;DR: In this article, the development of the near wake of a vertical axis wind turbine is investigated by stereoscopic particle image velocimetry in an open-jet wind tunnel on an H-shaped rotor, operated at a tip speed ratio of 4.5 and an average chord-based Reynolds number of 1.7 × 10 5.
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Particle tracer response across shocks measured by PIV
TL;DR: In this article, the experimental requirements for a reliable and unbiased measurement of the particle response time τ p and length ξ p based on a single-exponent decaying law were investigated.
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Experimental analysis of the wake of a horizontal-axis wind-turbine model
L. E. M. Lignarolo,Daniele Ragni,C. Krishnaswami,Q. Chen,Q. Chen,C.J. Simao Ferreira,G.J.W. van Bussel +6 more
TL;DR: In this article, the vortical structures of the wake of a horizontal-axis wind-turbine model are investigated in the Open Jet Facility wind-tunnel of Delft University of Technology.
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Noise reduction mechanisms of sawtooth and combed-sawtooth trailing-edge serrations
TL;DR: In this article, a combed-saw-tooth serration was used to mitigate turbulent boundary-layer trailing-edge noise in wind-turbine blades, and it was found that the presence of combs significantly reduced the intensity of scattered noise but not the frequency range of noise reduction.
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PIV-based pressure fluctuations in the turbulent boundary layer
TL;DR: In this article, an unsteady pressure field is obtained from time-resolved tomographic particle image velocimetry (Tomo-PIV) measurement within a fully developed turbulent boundary layer at free stream velocity of U ∼ 9.3 m/s and Re ∼ 2,400 m/m/s.