Articoli scientifici

Gli articoli scientifici rappresentano la principale forma di comunicazione ufficiale della comunità scientifica, tramite la quale i singoli autori o i gruppi di ricerca rendono pubblici i metodi ed i risultati dei propri lavori, evidenziando in maniera trasparente e verificabile metodo e risultati verificati da un pool di revisori (revisione paritaria) e pubblicati sulle riviste scientifiche.

Nel seguito è riportata una selezione dei principali articoli scientifici di interesse sulle turbine eoliche ad asse verticale e orizzontale scritti da Lorenzo Battisti in collaborazione con colleghi (Università degli Studi di Trento, Politecnico di Milano, Università degli Studi di Roma Tre, Technical University of Denmark) e con il suo gruppo di ricerca (Università degli Studi di Trento).

Turbine ad Asse Verticale
​

Articolo in Energy 111:484-497 · September 2016

Wind tunnel testing of the DeepWind demonstrator in design and tilted operating conditions​
Battisti,L.; Benini,E.; Brighenti,A.; Raciti Castelli, M.; Dell'Anna,S.; Dossena, V.; Persico, G.; Paulsen, U. S.; Pedersen, T. F.
​
Abstract
The DeepWind Project aims at investigating the feasibility of a new floating vertical-axis wind turbine (VAWT) concept, whose purpose is to exploit wind resources at deep-water offshore sites.The results of an extensive experimental campaign on the DeepWind reduced scale demonstrator are here presented for different wind speeds and rotor angular velocities, including also skewed flow operation due to a tilted rotor arrangement. To accomplish this, after being instrumented to measure aerodynamic power and thrust (both in streamwise and transversal directions), a troposkien three-bladed rotor was installed on a high precision test bench, whose axis was suitable to be inclined up to 15° with respect to the design (i.e. upright) operating condition.The experiments were performed at the large scale, high speed wind tunnel of the Politecnico di Milano (Italy), using a "free jet" (open channel) configuration. The velocity field in the wake of the rotor was also fully characterized by means of an instrumented traversing system, to investigate the flow distribution downstream of the test section.Special care is taken in the description of the experimental set-up and of the measured data, so that the present results can be used as a benchmark for the validation of simulation models.​

URL: http://www.sciencedirect.com/science/article/pii/S036054421630696X
DOI: 10.1016/j.energy.2016.05.080

---

Turbine ad Asse Orizzontale
​

Articolo in  JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, v. 2012, n. 107-108 (2012), p. 263-273

The ideal power curve of small wind turbines from field data
​F. Trivellato; L. Battisti; G. Miori
​
Abstract
The present study aims at assessing the ideal power curve of fixed-speed, passive stall, small horizontal axis wind turbines from turbulent field data. The ideal power curve refers to ideal conditions (e.g., the wind is steady, laminar, spatially uniform and undisturbed by the turbine; no yaw error; the power output is intended in steady state). The ideal power curve has two main applications: the prediction of the wind energy that can be captured and the extension of the power curve to sites having different turbulence levels from the primitive test site. A 12 kW fixed-speed wind turbine was monitored for two years in a fairly turbulent site; the power train of the turbine had no appreciable filtering effect on the wind fluctuations. The ideal power curve was analytically derived by a Taylor's expansion (whose convergence was enhanced by the Shanks' transformation) and by an accurate analytical assumption of the ideal power coefficient. The present analytical solution is easy to handle and compared successfully to the IEC-based curve. The turbulence increases/diminishes the power output for velocities less/greater than the velocity at the inflection point of the power curve. Energy predictions by the ideal curve are within the inherent experimental error.

URL: http://www.sciencedirect.com/science/article/pii/S0167610512001286
DOI: 10.1016/j.jweia.2012.04.026