Wind propulsion

Thies, Fabian; Fakiolas, Konstantinos

doi:10.1016/b978-0-12-824471-5.00016-5

Cited by 1 publication

(1 citation statement)

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“…Among various strategies, wind-assisted ship propulsion (WASP) for large commercial vessels is regarded as a highly effective approach to decrease dependence on fossil fuels. Several innovative WASP technologies, such as wingsails, Flettner rotors, and kite sails, have been developed in recent decades (Khan et al, 2021;Thies & Fakiolas, 2022). Among these concepts, wingsails have some advantages (Zhu, 2023).…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel tests on aerodynamic loads and structural responses of crescent-shaped wingsails

Zhu,

Chernoray,

Ringsberg

et al. 2024

Preprint

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Wingsails as a classical means for wind-assisted ship propulsion is booming today. Crescent-shaped wingsails have shown great potential considering their aerodynamics in thrust generation. However, there have been few studies on its structural responses exposed to unsteady aerodynamic loads. In this study, a crescent-shaped wingsail at a \(1:100\) scale is investigated by using wind tunnel tests. The wingsail with aspect ratios of \(0.19\) and \(0.33\), which are derived from practical wingsail design, are measured at the angle of attack (\(\alpha\)) from \(0^\circ\) to \(90^\circ\), and at the wind speed from \(20 m/s\) to \(40 m/s\). The wind loads, pressure distribution, and wingsail tip displacements are measured and discussed. A study of the Reynolds number sensitivity indicates that the trends of the force coefficients and critical \(\alpha\) are changed when the Reynolds number (\(Re\)) is above \(3.1\times {10}^{5}\). Besides, at \(Re=3.1\times {10}^{5}\) a lift crisis is found for \(\alpha\) below \(10^\circ\), and a drag crisis happens for \(\alpha =0^\circ\) at \(Re=3.6\times {10}^{5}\). Structural response analysis is conducted based on the wingsail tip displacement in the direction perpendicular to the chord line. The fundamental eigenfrequency of the structure, instead of the flow-induced frequencies, is found to dominate the fluid-structure interaction measured in the tests. Furthermore, the aerodynamic performance of a three-wingsail system is analyzed based on experiments. Notable interactions are found among the three wingsails.

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Section: Introductionmentioning

confidence: 99%