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Post Reply Vaccum pressure jet engine enthusiast
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Posted 8/8/17 , edited 8/8/17
So I was thinking of coming up with a vacuum pressure jet engine. As you known inside the vacuum is a place of low vacuum and low vaccum sucks air in. So the simple design of a wing looks like this.

http://w3.shorecrest.org/~Lisa_Peck/Physics/syllabus/phases/gases/gaswp03/will/fig1.jpg

Now imaging circling around this wing into a cylinder which is hollow inside if you can imagine the shape in 3D you know what I am talking about.

So the air flows through the center and outside of the cylinder creating high pressure outside and low pressure inside. This is not a wing because you got high pressure all around the cylinder trying to squeeze it in. But if the material is tough, the center low pressure would suck air in while leaving on the back at the high pressure zone. Or the other way around, flip the wing 180 degrees.

With enough speed it should propel on itself

P.S Sort of like the plane engine, but hollow inside
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Posted 8/8/17
Ok, I'll bite

How do you keep the vacuum in the centre? As soon as air flows in to fill it (from both sides, no unidirectional thrust there) you'll have a metal tube. That falls out of the air.

I'm willing to be convinced.
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28 / F / The margins
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Posted 8/8/17
Do you send me e-mails?
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Posted 8/8/17 , edited 8/8/17

CasualObserver wrote:

Ok, I'll bite

How do you keep the vacuum in the centre? As soon as air flows in to fill it (from both sides, no unidirectional thrust there) you'll have a metal tube. That falls out of the air.

I'm willing to be convinced.


As soon as air enters the tube, it should have a low pressure zone inside the tube and high pressure zone outside the surrounding tube, but since the tube structure does not change, the low pressure zone inside should theoretically sucks in more air because air flows from high pressure zone to low pressure zone


auroraloose wrote:

Do you send me e-mails?


Did not
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Posted 8/9/17
What makes you think that lowered internal pressure would suck air in from the front and blow it out the back? It isn't directional.

The thing you have described is a converging-diverging nozzle. It converts between high-pressure sub-sonic flow and low-pressure supersonic flow, i.e. the regular nozzle of a rocket or jet engine which turns the hot gas into thrust. Those aren't perpetual motion machines, as you have noticed.
Posted 8/9/17
You talking bout a X-zylo?



https://www.youtube.com/watch?v=-GavWPxAAlY
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Posted 8/12/17 , edited 8/12/17

loremipsumdolor wrote:

What makes you think that lowered internal pressure would suck air in from the front and blow it out the back? It isn't directional.

The thing you have described is a converging-diverging nozzle. It converts between high-pressure sub-sonic flow and low-pressure supersonic flow, i.e. the regular nozzle of a rocket or jet engine which turns the hot gas into thrust. Those aren't perpetual motion machines, as you have noticed.


Right, in order for perpetual output the vacuum sucking the air in and the output thrust must be greater than the current moving velocity.



That looks pretty cool lol

P.S If you made it out of plastic it will be too light though, need to add weight for the momentum
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Posted 8/13/17

fredreload wrote:
Now imaging circling around this wing into a cylinder which is hollow inside if you can imagine the shape in 3D you know what I am talking about.


You don't seem to understand the diagram you shared.

That airplane wing works via the Bernoulli effect. Essentially, when you push air past the wing, it has to travel farther over the top than it does over the bottom. And because you have the same quantity of air in both places, the air on the top of the wing - being spread over a larger area - has lower pressure. So the high pressure BOTTOM pushes the wing UP into the low pressure area.

Now, wrap this into a tube, and you have destroyed the notion of "up" because your "top" has become either the inside or the outside. Either way, an airstream moving through it is creating a pressure zone in the centre - either low or high - which does precisely dick because all parts of the cylinder are being pushed with equal force at all angles.

See, that wing does not HAVE thrust. It is NOT an engine. Wings provide LIFT. Something else provides the thrust, which moves the plane to move the air to create the lift that picks it up. There is no way to topologically modify a wing so it becomes an engine, too.
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Posted 8/13/17 , edited 8/13/17

cdarklock wrote:


fredreload wrote:
Now imaging circling around this wing into a cylinder which is hollow inside if you can imagine the shape in 3D you know what I am talking about.


You don't seem to understand the diagram you shared.

That airplane wing works via the Bernoulli effect. Essentially, when you push air past the wing, it has to travel farther over the top than it does over the bottom. And because you have the same quantity of air in both places, the air on the top of the wing - being spread over a larger area - has lower pressure. So the high pressure BOTTOM pushes the wing UP into the low pressure area.

Now, wrap this into a tube, and you have destroyed the notion of "up" because your "top" has become either the inside or the outside. Either way, an airstream moving through it is creating a pressure zone in the centre - either low or high - which does precisely dick because all parts of the cylinder are being pushed with equal force at all angles.

See, that wing does not HAVE thrust. It is NOT an engine. Wings provide LIFT. Something else provides the thrust, which moves the plane to move the air to create the lift that picks it up. There is no way to topologically modify a wing so it becomes an engine, too.


Yes it would attempt to force the tube at the center without any LIFT force I know. But with a low or high pressure zone INSIDE the tube. I speculate it would attempt to SUCK in air and push it out of the back, creating a thrust. No offense, just explanation here


P.S Forward only, upward you'll need a wing
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Posted 8/13/17
Cool?
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Posted 8/13/17


Not sure, just speculation
runec 
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Posted 8/13/17

auroraloose wrote:

Do you send me e-mails?


I laughed at that harder than I probably should have.
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Posted 8/13/17 , edited 8/13/17

runec wrote:


auroraloose wrote:

Do you send me e-mails?


I laughed at that harder than I probably should have.


I know, auroraloose seems pretty hot


P.S But when questioned, better say no
runec 
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Posted 8/13/17

fredreload wrote:
I know, auroraloose seems pretty hot

P.S But when questioned, better say no


What.

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Posted 8/13/17

runec wrote:


fredreload wrote:
I know, auroraloose seems pretty hot

P.S But when questioned, better say no


What.



I mean when she asked: "Did you send me emails?"
I better say no
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