Development of Air lubrication system and verification by the full scale ship test

Mizokami, Shuji; Kawakita, Chiharu; Kodan, Youichiro; Takano, Shinichi; Higasa, Seijiro; Shigenaga, Ryosuke

doi:10.2534/jjasnaoe.12.69

Cited by 10 publications

(6 citation statements)

References 1 publication

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“…5, gas flux according to flow speed was used as reference data for calculating compressor power for each ALS type. In addition, the gas fluxes of the air lubrication system estimated from the sea trials of the bulk carrier and module carrier are also displayed (Hoang et al, 2009;Mizokami et al, 2010). According to M€ akiharju et al ( 2012), these investigations hypothesize that an air layer or transitional region formed on the hull's bottom because the reduction in friction drag was lowered by 20e40%, which is partly compatible with the outcomes of Elbing et al (2008), and Makiharju et al (2010).…”

Section: Power Consumption By Air Compressormentioning

confidence: 99%

“…Mitsubishi Heavy Industry first installed its air lubrication system (MALS) on a newly built ship and showed up to 12% net energy savings in a sea trial of a module carrier (Mizokami et al, 2010). As the nominal thickness of the air layer that forms on the bottom of the hull increases, it has also been confirmed that net energy savings increase as well.…”

Section: Introductionmentioning

confidence: 99%

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Potential Energy Savings of Air Lubrication Technology on Merchant Ships

Kim¹,

Steen²

2022

SSRN Journal

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Section: Power Consumption By Air Compressormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential Energy Savings of Air Lubrication Technology on Merchant Ships

Kim¹,

Steen²

2022

SSRN Journal

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“…In 2010, the Mitsubishi Heavy Industries Group tested the micro-bubble air lubrication system in real ship conditions on the NYK-subsidiary and NYK-Hinode modular transport vessels. According to these experiments, the net energy-saving benefit could only be as high as 12% [17].…”

Section: Introductionmentioning

confidence: 95%

Numerical Study on the Influence of Water Depth on Air Layer Drag Reduction

Ye,

Ou,

Xiang

et al. 2024

Applied Sciences

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Over the years, air lubrication technology has been widely applied to maritime vessels, demonstrating its significant energy-saving and emission-reducing effects. However, the application of this technology in inland waterway transportation faces unique challenges due to the shallower water depths, particularly during low water periods. Under such conditions, the formation of the air layer and its associated drag-reduction effects may undergo alterations. Conducting research on air lubrication technology in shallow water conditions holds great practical significance for promoting its application in inland waterway vessels. Therefore, a numerical study is undertaken to examine the impact of water depth on Air layer Drag Reduction (ALDR) to promote the use of ALDR technology on inland canal boats with shallow water depths. The object was a specific river-sea direct ship model, and a groove was created at the bottom of the model with air injection. At two distinct speeds, numerical simulations were run for four different depths: deep water, moderate water, shallow water, and ultra-shallow water. A comparative examination of the air layer morphology on the ship bottom and drag reduction was conducted to investigate the impact of water depth on ALDR and confirm the viability of using ALDR technology on shallow-water navigation boats. The results indicate that due to the change in the velocity and pressure fields at the bottom of the ship, the efficiency of drag reduction and the form of the air layer on the ship’s bottom are significantly impacted by variations in water depth in restricted waters. However, the total resistance can still be significantly reduced by setting grooves on the hull with air injected in shallow waterways. Reduced frictional resistance no longer predominates the overall resistance reduction in shallow water; the proportion of the decrease in viscous pressure resistance rises and can reach up to 4.8 times the decrease in frictional resistance. The research confirms the application prospects of this technology on inland waterway transport ships.

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“…Kodama et al 11) reported approximately 5% total energy savings for an experimental ship. Mizokami et al 12) also succeeded in achieving more than 10% fuel savings in sea trials. In addition, various studies have been carried out to promote the efficiency of frictional drag reduction by air bubbles 13)14) .…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of Air Bubbles around the Ship Hull on the Propulsive Efficiency

Arakawa,

Kawashima,

Hamada

et al. 2023

J.JASNAOE

Self Cite

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Injecting air at the ship bottom to create a mixed layer of seawater and air bubbles between the hull surface and seawater is well known as an efficient energy saving technique to reduce the frictional drag of ships. Various studies have been conducted to promote the efficiency of frictional drag reduction by bubbles. In contrast to the extensive studies on frictional drag reduction involving bubbles, very little attention has been given to the influence of bubbles on the self-propulsion factor. However, the self-propulsion factor is one of the major ship performance parameters. The purpose of this study was to investigate the influence mechanism between a hull covered by air bubbles and propeller open water characteristics. A numerical simulation approach that can be applied to a self-propelled ship with air bubbles around the hull was used for this purpose. It was found that air bubbles around the hull could increase the inflow velocity to the propeller. It was also found that bubbles around the stern could affect the viscous pressure resistance and that the effect could be strongly affected by the propeller. Furthermore, the results showed that air bubbles could reduce the hull resistance and increase the inflow velocity to the propeller, which in turn could reduce the thrust loading coefficient and improve the propeller efficiency. In conclusion, the results indicated that air bubbles around the hull could influence the self-propulsion factors (the wake

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Development of Air lubrication system and verification by the full scale ship test

Cited by 10 publications

References 1 publication

Potential Energy Savings of Air Lubrication Technology on Merchant Ships

Potential Energy Savings of Air Lubrication Technology on Merchant Ships

Numerical Study on the Influence of Water Depth on Air Layer Drag Reduction

Numerical Study on the Influence of Air Bubbles around the Ship Hull on the Propulsive Efficiency

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