Print Email Facebook Twitter Drag power kite with very high lift coefficient Title Drag power kite with very high lift coefficient Author Bauer, F. (Technische Universität München) Kennel, R.M. (Technische Universität München) Hackl, C.M. (Munich School of Engineering) Campagnolo, F. (Technische Universität München) Patt, M. (Hochschule Kempten) Schmehl, R. (TU Delft Wind Energy) Date 2018 Abstract As an alternative to conventional wind turbines, this study considered kites with onboard wind turbines driven by a high airspeed due to crosswind flight (“drag power”). The hypothesis of this study was, that if the kite's lift coefficient is maximized, then the power, energy yield, allowed costs and profit margin are also maximized. This hypothesis was confirmed based on a kite power system model extended from Loyd's model. The performance of small-scale and utility-scale kites in monoplane and biplane configurations were examined for increasing lift coefficients. Moreover, several parameters of the utility-scale system were optimized with a genetic algorithm. With an optimal lift coefficient of 4.5, the biplane outperformed the monoplane. A 40 m wing span kite was expected to achieve a rated power of about 4.1 MW with a power density of about 52 kW/m2. A parameter sensitivity analysis of the optimized design was performed. Moreover, to demonstrate the feasibility of very high lift coefficients and the validity of a utilized simplified airfoil polar model, CFDs of a proposed high-lift multi-element airfoil were performed and the airfoil polars were recorded. Finally, a planform design of a biplane kite was proposed. Subject Crosswind kite powerDrag powerAirborne wind turbineHigh-lift airfoilBiplaneGenetic algorithm To reference this document use: http://resolver.tudelft.nl/uuid:a62018f4-1b41-4ceb-afa1-fecfaf82e2f3 DOI https://doi.org/10.1016/j.renene.2017.10.073 Embargo date 2018-04-30 ISSN 0960-1481 Source Renewable Energy, 118, 290-305 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 F. Bauer, R.M. Kennel, C.M. Hackl, F. Campagnolo, M. Patt, R. Schmehl Files PDF 1_s2.0_S0960148117310285_main.pdf 2.75 MB Close viewer /islandora/object/uuid:a62018f4-1b41-4ceb-afa1-fecfaf82e2f3/datastream/OBJ/view