Aerodynamic Performance of a New Double-Flap Wing Sail

Li, Dongqin; Zhang, Yili; Dai, Jingjing; Li, Guohuan

doi:10.2478/pomr-2019-0067

Cited by 10 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to [18] wing sail should be as small as possible and therefore should apply high lift devices, also sails or their skins should be reefable from the wing structure. In [19], [20] a collapsible wing sail is proposed with double fl aps. Also, the best confi guration of parameters was investigated and using a numerical simulation method the aerodynamic performance of the new wing sail was analyzed.…”

Section: Wing Sails / Krilna Jedramentioning

confidence: 99%

Wind Assisted Ship PropulsionTechnologies – Can they Help in Emissions Reduction?

et al. 2021

View full text Add to dashboard Cite

According to International Maritime Organization, emissions coming from global shipping are expected to increase 50% to 250% by the year 2050. This concern led to the introduction of various regulations that aims to encourage ship owners and builders to explore innovative renewable technologies. The main focus of this article is on wind-assisted ship propulsion technologies, as a complement to ship propulsion, such as rigid sail, soft sail, wing sail, kite, and Flettner rotor. These technologies are not widely accepted because ship owners have doubts due to the lack of real-life results and their implementation and efficiency greatly depends on ship design and purpose. This article shows the progress in the field of wind-assisted ship propulsion in the last 15 years which proved the concept as they have the potential to reduce fuel consumption, thus emissions, by double digits. The conclusion is drawn, from fuel savings percentages, that rotor and soft sails technologies have great potential in the future of the shipping industry.

show abstract

Section: Wing Sails / Krilna Jedramentioning

confidence: 99%

Wind Assisted Ship PropulsionTechnologies – Can they Help in Emissions Reduction?

et al. 2021

View full text Add to dashboard Cite

show abstract

“…By rotating the flips, a camber can also be made by these concepts (Smith, 1975). Conventional airfoil profiles, such as NACA 0015, are normally used in these concepts, so that the characteristics of the flow field induced by these wingsails do not show significant differences from other similar applications like airplane wings (Blakeley et al, 2012;Li et al, 2019). Further, Kuang et al (2023) studied the effect of the chord length ratio on two-element wingsails in the aspect of the aerodynamic performance.…”

Section: Introductionmentioning

confidence: 99%

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

Zhu,

Chernoray,

Ringsberg

et al. 2024

Preprint

View full text Add to dashboard Cite

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.

show abstract

“…Wind power, in particular, has garnered significant attention as the most accessible energy source during ocean voyages [1]. Various research studies have explored the use of wing sails [2,3], airborne wind turbines [4,5], wind kites [6,7], rotor sails [8][9][10][11][12][13][14][15], and other methods as auxiliary propulsion systems for ships.…”

Section: Introduction 1previous Studiesmentioning

confidence: 99%

Preliminary Feasibility Study of a Magnetic Levitation Rotor Sail for Coastal Area Operations

Lee,

Kim,

Park

et al. 2023

JMSE

View full text Add to dashboard Cite

The continuous strengthening of environmental regulations is expected to have a significant impact on the vessel operations of shipping companies. Each country must reduce greenhouse gas emissions from ships operating in domestic coastal areas to meet its Nationally Determined Contributions (NDC). For new vessels, we are assessing potential emission reductions through various technologies, recognizing that transitioning to alternative fuels is inevitable to achieve our ultimate goal of zero emissions. However, the introduction of alternative fuels for ships involves numerous challenges, including the overall replacement of propulsion systems, etc. Additionally, to ensure that existing ships can comply with the gradually increasing environmental regulations, the immediate adoption of bridge technologies that can be applied is essential. Rotor sails are recognized as a technology that can be installed on both new ships and vessels in operation, offering carbon emission reductions through thrust assistance. Rotor sails have traditionally been mainly employed on ocean routes with consistent wind patterns. In this paper, we conducted a review of the feasibility of operating rotor sails in coastal areas where wind direction frequently changes and wind intensity is not constant. Particularly, a concept of a rotor sail with magnetic bearings for the rotor sail system, utilizing the principle of magnetic levitation, is suggested. The reduction in frictional forces during rotor sail operation contributes to increased maintainability and advantages in terms of noise and vibration. Specifically, in this study, a structural design for minimizing weight for optimal performance has been carried out.

show abstract

Aerodynamic Performance of a New Double-Flap Wing Sail

Cited by 10 publications

References 5 publications

Wind Assisted Ship PropulsionTechnologies – Can they Help in Emissions Reduction?

Wind Assisted Ship PropulsionTechnologies – Can they Help in Emissions Reduction?

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

Preliminary Feasibility Study of a Magnetic Levitation Rotor Sail for Coastal Area Operations

Contact Info

Product

Resources

About