I have referred to pressure differences but it is actually a change in the flow of the air molecules that drives the force. For every action there is an equal and opposite reaction.
Posted on 08/02/2024 11:16:26 AM PDT by Red Badger
It says they can be retracted, so I would imagine so.
“It doesn’t work for cargo ships”
Testing on commercial ships show >20% fuel savings with 4 rotors.
“Your 100 hp is not realistic.”
Thanks for catching that—with respect to “tall ships” sailing equivalent horsepower...
:-/
The number should have been:
ONE HUNDRED THOUSAND horsepower.
I typed, Zha's rotor sucks air in and then blows out its own wind that curves around the rotor.
That is exactly what you just said. I was agreeing with you.
“That is exactly what you just said. I was agreeing with you.”
Almost. You referenced a “rotor”.
I was clarifying that it doesn’t rotate.
Yes that's clear, but if you had watched this video that "WhoisAlanGreenspan?" linked to, you would have seen that this professor also showed the effect of air blowing against a static rotor just as “The CoFlow Jet cylinders developed by Zha..."
If you also think a little you would see that Professor Zha was inspired by the studies of the Bernoullis, Magnus, Flettner and all of the others in the interim up until Professor Zha's worked out his new system. If you read the text at the OP, you see that Professor Zha used the Flettner rotors to explain his new system.
Isaac Newton's most famous statement was, “If I have seen further it is by standing on the shoulders of Giants”.
“And if you had read the article............”
Why?
We had a headline to go by.
“Yes that’s clear, but if you had watched this video that “WhoisAlanGreenspan?” linked to, you would have seen that this professor also showed the effect of air blowing against a static rotor just as “The CoFlow Jet cylinders developed by Zha...””
Nope. When he blew on the rotor evenly as a wind blows on a CoFlo there was NO effect, i.e., no pressure difference.
GeCheng Zha, a professor of aerospace engineering and director of the Aerodynamics and Computational Fluid Dynamics Lab at the University of Miami College of Engineering is using an approach that is a variant of the Flettner rotors developed in the 1920s, but with a fundamental twist.So, in the article it was called a variant of a rotor, but I get your point now.
I have referred to pressure differences but it is actually a change in the flow of the air molecules that drives the force. For every action there is an equal and opposite reaction.
I bet you didn't watch the whole video did you?
“Wait a minute, when he blew air at the edges ...”
I guess I have repeat my previous:
When he blew on the rotor evenly as a wind blows on a CoFlo there was NO effect, i.e., no pressure difference.”
“I bet you didn’t watch the whole video did you?”
Did you miss the part where he blew evenly and there was no effect? It was immediately before where he blew on the “edges”.
You do of course realize the ship you show is not a container ship but a bulk carrier as is evident by the hatches on the deck to load and unload the bulk cargo...right...right? From the looks of it there would be a few thousand square meters of wind capture area. Humans for 50,000+ years moved across the water by wind power alone. Every corner of this planet had humans carried by water and sails with our cargo in tow.
This group improved on Magnus sails by removing the rotation and using flowing air along the cylinder surface instead. Added benefit is you can reverse the flow.direction and move the injection point in a full 360 range this means you can use the Magnus effect from any wind angle including dead ahead just by changing the angle of the injection air jets. These are lift devices not drag soaks they have a lift coefficient which means they can have 3 to 10 times as much force as a sail of equal sq meters lift is always better than drag.
-PJ
“you can use the Magnus effect “
As I understand it, The term “Magnus Effect”. applies to the behavior of a spinning object? While the underlying physics are the same the CoFlo is not spinning.
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