Sail–sail and sail–hull interaction effects of hybrid-sail assisted bulk carrier

Fujiwara, Toshifumi; Hearn, Grant E.; Kitamura, Fumitoshi; Ueno, Michio

doi:10.1007/s00773-005-0191-4

Cited by 27 publications

(11 citation statements)

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“…Fujiwara et al (2003) proposed a hybrid sail and evaluated its aerodynamic characteristics. They investigated the sail-sail and sail-hull interaction effects of a hybrid sail in a wind tunnel experiment (Fujiwara et al, 2005). Recently, Nakashima et al (2010Nakashima et al ( , 2011 and Yamashita et al (2011) investigated the aerodynamic interaction phenomena between each hard sail in the cascade by wind tunnel measurements and numerical simulations and they corroborated that the sails in the cascade were set independently and can provide higher aerodynamic performance than that in a parallel arrangement.…”

Section: Introductionmentioning

confidence: 74%

A study on the performance of cascade hard sails and sail-equipped vessels

Nihei

Nakashima

et al. 2015

Ocean Engineering

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Section: Introductionmentioning

confidence: 74%

A study on the performance of cascade hard sails and sail-equipped vessels

Nihei

Nakashima

et al. 2015

Ocean Engineering

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“…Trimming each sail independently has an overall positive effect: the increase in driving force experienced by the first sail is enhanced and the decrease in performance of the remaining sails is reduced. Another interesting output of the research is that the multiple-sail bootstrap effect as suggested by Gentry did not occur for any sail arrangement tested in [17].…”

Section: Introductionmentioning

confidence: 88%

“…In the context of wind-assisted propulsion for commercial ships, the first relevant study that tackled the aerodynamic interaction between several sails is the work presented by Fujiwara et al in [17]. In this research, the performance of a single soft sail, expressed in terms of driving force coefficient, is compared to the performance of a sail plan composed of four equal sails.…”

Section: Introductionmentioning

confidence: 99%

Wind-tunnel experiments on the aerodynamic interaction between two rigid sails used for wind-assisted propulsion

Bordogna

Keuning

Huijsmans

et al. 2018

ISP

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Wind-assisted propulsion has recently attracted attention as one viable option to drastically reduce pollutant emissions produced by ships. Despite its potential, there is still a substantial lack of understanding of the physical aspects proper of wind-assisted ships, leading to unreliable fuel-saving claims. In the context of the development of a performance prediction program for such type of hybrid ships, the research presented herewith deals with the aerodynamic interaction between two rigid sails. Wind-tunnel experiments were carried out on a single sail and on a two-sail arrangement, during which force and pressure measurements were taken on each sail. For the two-sail arrangement, two gap distances between the sails were investigated and the tests were performed at apparent wind angles ranging all typical sailing conditions. The results show that for an extended interval of moderate apparent wind angles the aerodynamic interaction has a positive effect on both sails. On the contrary, at smaller and at larger angles the interaction effects are detrimental for the downstream sail. The outcome of the present work indicates that the number of sails employed and their gap distance are important parameters to determine the aerodynamic interaction effects.

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“…It was also the configuration used for the deployment of JAMDA rigid sails. According to a study, the overall aerodynamic performance of the sails mounted on a ship in this type of configuration is decreased on average by approximately 18% due to the airflow interference between the sails and the sails and hull (Fujiwara et al 2005). It is suggested however in another study that interference between the sails could be reduced by adjusting the AoA for some or all sails or by increasing the distance between them (Li et al 2012).…”

Section: Inline Configurationmentioning

confidence: 99%

Analysis of drag, airflow and surface pressure characteristics of a segment rigid sail

Atkinson

Binns

2018

Journal of Marine Engineering & Technology

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Rigid sails have been used on powered ships in the past to reduce fuel consumption and recently there has been renewed interest in this technology. Rigid sails could potentially be used on a wide variety of ships and vessels; therefore, it is necessary to better understand the performance and characteristics of these devices. The present work investigated the airflow and drag characterises of a segment rigid sail using a virtual wind tunnel. Sail surface pressures were also observed and recorded. It was determined that the most effective angle of attack for this type of rigid sail was between approximately 10°and 30°. It was also noted that at larger angles of attack, the presence of a significant wake would limit the effectiveness sails mounted downwind.

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Sail–sail and sail–hull interaction effects of hybrid-sail assisted bulk carrier

Cited by 27 publications

References 0 publications

A study on the performance of cascade hard sails and sail-equipped vessels

A study on the performance of cascade hard sails and sail-equipped vessels

Wind-tunnel experiments on the aerodynamic interaction between two rigid sails used for wind-assisted propulsion

Analysis of drag, airflow and surface pressure characteristics of a segment rigid sail

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