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Q&A

What are the efficient methods to vacuum or pump air into 15 meters underwater?

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Say we have a four underwater components tidal power / hydro power system.


Component A. A propeller would always orient along the same direction regardless the direction of the flow.

This is the easy part, for instance, an upright cross flow fan with movable blades.


Component B. A module would vacuum or pump air into the water.

Like two gears with different radius. This module is driven by the moment force while the water pushing the bigger gear.The bigger gear is the component A, the much smaller gear is Component B. Which means, the torque force of component B is relative high, and the speed of component B is low, maybe 1 to 5 rounds per second.


Component C. A rail from component B to component D for collecting the air generated by component B and guiding the air to move to component D.


Component D. The core of the generator with cables, magnets, and copper wires.

The basic shape of component D is a cross flow fan. The constructure from the main body to each blade of this cross flow fan should be able to trap air in it. It might be reasonable to combine with similar constructure like component A.


These four components could be arranged freely like lego blocks.


There have to be larger and constant enough power to make component D spin, but the large is never constant when we speak to nature power. We know the buoyant force of 1 meter cubic air is 1 ton, and we can accumulate air into the system even for 1g buoyant force only. If we can use the relative high moment force to vacuum or pump as much air as possible into the water, which will be the main task of component B, the air, not water. Maybe we can have another tidal power or hydro power method with relatively stable output.

When we use water flow to push the core unit to generate electricity, all small power will be used to fight against the maximum static friction. And also all power have to fight the water in front of the flow first while the water traveling from component B to D. Which are all waste of energy.

With this method / system, when component B stopped, the water would be push into the tubes by pressure. This means at the beginning of next run, we will have to eject the water inside the tube before we could see the air comes out from the tubes. It is a waste of energy too. The depth is 15 meters, valves in this kind of pressure need a lot of force to switch, which is a waste too.

So the first major questions we need to figure out first would be component B. And the second is where to build this module.


I think the well customized jet turbine and venturi tube might be one solution, as long as we adjust them to not to generate micro bubbles.

So, what are the efficient methods to vacuum or pump air into 15 meters underwater?


The best laid planes. No video clips, just this text.




I keep running across something in the recent monthes. So I am aware of some strong comments without identical standards. I hate to say this, but I have very good reasons and experiences to keep emphasizing the rights in my posts.


Method watet pool: https://physics.codidact.com/posts/287039


The things I dare to post around are never simple. Like the water pool method, there are at least five aspects of further discussions of the system in this post. Please use your imagine and creativity, you will find them when you do build one in the ocean. You may need wilder mind to find two or more of them.

And trust me, you will be excited when you find these new windows.

Energy for people's livelihood should belong to all people. They shall never be the laverages of any form of war and invasion. Do things you can to make it different please.

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4 comment threads

x-post https://engineering.stackexchange.com/questions/52617/what-are-the-efficient-methods-to-vacuum... (7 comments)
Cognitive Warfare for this, really? (1 comment)
@Olin Lathrop, thank you for demonstrating your INTENTIONS. (1 comment)
Too confusing. Show a diagram. (1 comment)

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