Air Lubrication for Cruise Ships - The Silverstream® System
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- Опубліковано 14 бер 2017
- 要觀看帶有中文字幕的視頻，請訪問: player.vimeo.com/video/309321409
The Silverstream® System, an air lubrication technology for shipping, is a unique system that reduces frictional resistance between the water and the hull surface, dramatically reducing fuel consumption and associated emissions.
Cruise operators are proactively looking to minimise the environmental impact of their operations without negatively impacting services. They are doing this by getting ahead of regulations and implementing proven clean technologies that increase efficiencies and reduce fuel consumption and associated emissions.
Air lubrication technology is one of the most comprehensively described eco-efficiency technologies validated by the United Nations International Maritime Organisation.
The Silverstream® System is also the only proven air lubrication technology that is applicable for both new build and existing vessels.
To find out more about the system, please visit our website: www.silverstream-tech.com/
Follow us on Twitter: / silverstreamtec
www.silverstream-tech.com/ - Наука та технологія
The principal of pumping air under a hull has been around since John Thornycroft in 1877. Though this is using more modern technology than Thornycroft's clockwork powered bellows on a scale boat, we should tip our hats to his ingenuity.
where air compressors take suction from? does savings in fuel greater than the power needed to produce the air boundary layer? how are the microbubbles kept in the boundary layer?
Hi Sanzhar. The compressors pump air down into the air release units at very low pressure, around 1 atmosphere, meaning the power needed to generate the air bubble carpet is extremely low. In terms of keeping the microbubbles in the boundary layer, they form a rigid carpet and each bubble is approximately 1mm in diameter. This means they do not try to merge and therefore escape the boundary layer. Finally, we have proven fuel savings of 5-10% in our installations to date. These results have been independently verified by a variety of bodies including HSVA and Lloyd's Register.
Imagine if it failed and water was flooding the pipes and they burst.
Air & Water check valves. Pipe should be enough of a pneumatic buffer for the head pressure. I'm not affiliated, nor an engineer. Just spend too much time on UA-cam. The 'algorithm' may start to take my job soon if they figure out how to train it for STEM topics suggestions... its getting there.
It would sink the ship ^^
Thank you for your comment. The air release units on the vessel's flat bottom are part of the hull construction. Our system therefore has no effect on the seaworthiness of the vessel.
I was just kidding, but its plausible that the ship could loose some buoyancy ;)
ua-cam.com/video/MSmAXp_BHcQ/v-deo.html
ua-cam.com/video/nAmlvYJnURs/v-deo.html
If the air isn't constrained at the bottom (like air cavity systems) what stops it from going on the sides of the ship (path of least resistance)?
@@My-Opinion-Doesnt-Matter It should be considered constrained under the hull if they are not allowed to leave the bottom surface. When the ship is turning and the bubbles are allowed to 'flow up' the sides, given enough quantity, it might have a slight but negligible impact on buoyancy. Would need to be dynamically simulated. Not hard if you know the multiphysics software. There are some free ones out there if you want to get back to me about the results (open source).
@@My-Opinion-Doesnt-Matter cold have an edge protruding down at sides and a bit higher flat bottom between them to hold bupples in place but willl the edge do something bad
@@My-Opinion-Doesnt-Matter lose * not loose. And no it increases buoyancy as shown in the video or else the fuel usage would go up. The bubbles in your videos are not comparable.
With air bubbles against the ships hull, cavitation and corrosion occur. In other words, a bad idea.
Newer hull coatings that move on from sacrificial anodes and biocidal coated steel to durable PTFE low fouling release energy coatings will not be affected. It would be interesting to have a study on the bubbles' ability to reduce or improve the fouling resistance of teflon and silicone coatings, though. The bubbles may slightly increase cavitation if they are allowed to travel into the clean water stream that the impellers or propellers pull in, however, they may also reduce the skin drag of the propeller significantly, while the overall thrust of the propeller may remain high. You would have to do a simulation.