"Cé hé sin" (michael-m-mouse)
06/13/2015 at 17:46 • Filed to: Two stroke
0
16|
"Cé hé sin" (michael-m-mouse)
06/13/2015 at 17:46 • Filed to: Two stroke | 0
| 16 |
By way of preview.
Jake - Has Bad Luck So You Don't Have To
> Cé hé sin
06/13/2015 at 17:52 |
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Badass
tromoly
> Cé hé sin
06/13/2015 at 18:00 |
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Is that compressor/supercharger spinning backwards, or is that to pull exhaust out of the chamber?
LappingLuke
> Cé hé sin
06/13/2015 at 18:00 |
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Do I not understand how superchargers work or is that one running backwards?
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Cé hé sin
> LappingLuke
06/13/2015 at 18:04 |
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It’s you. That’s the way they go. Air is trapped between the lobes and brought around the casing to the engine. The air doesn’t go through the middle of the blower.
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Cé hé sin
> tromoly
06/13/2015 at 18:10 |
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No, it’s going the right way. Air is carried around the casing between the lobes.
Look up Roots Supercharger on wiki.
Slave2anMG
> tromoly
06/13/2015 at 18:12 |
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The air doesn’t go thru the mesh; it goes around the outside and is displaced by the lobes meshing - the ‘finger’ of one rotor meshes into the ‘pocket’ of the other...it displaces the air out....it’s called a positive displacement pump since it’s not relying on centrifugal force like a turbo. It’s a little counterintuitive but that’s the way it works. I work with liquid pumps that work exactly the same way. The blower’s positive pressure is ‘scavenging’ the exhaust gases out of the cylinder thru the ports in the cylinder walls.
Grindintosecond
> Cé hé sin
06/13/2015 at 18:26 |
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Superior air parts is soon to deliver the Gemini diesel based on that exact GIF. 20%more range over a 4-stroke rotax powered light sport aircraft.
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LappingLuke
> Cé hé sin
06/13/2015 at 18:44 |
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Fascinating! I always assumed it was the other way.
ly2v8-Brian
> Cé hé sin
06/13/2015 at 18:56 |
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Saw a nice twin crank example of this style of two stroke in Berlin. I'd put the picture in but I can not put pictures or links in comments anymore.
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tromoly
> Cé hé sin
06/13/2015 at 19:14 |
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Huh, definitely didn’t learn that in my Fluids class.
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tromoly
> Slave2anMG
06/13/2015 at 19:16 |
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Gotcha, that’s pretty cool actually. We didn’t learn much about how pumps actually work in my Fluids class, was always under the impression that the air is channeled through the lobe overlap area in a Roots-style pump.
Brickman
> Cé hé sin
06/13/2015 at 19:54 |
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Horizontally opposed piston engine. Im actually makeing one out of LEGO right now :D Will make out of real bricks and power it.
Roots blower and all! Doubt they have dual flywheels, but just to keep it weired.
TheOnelectronic
> LappingLuke
06/13/2015 at 23:05 |
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Same here.
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TheOnelectronic
> Cé hé sin
06/13/2015 at 23:06 |
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Given that the other way seems like the obvious way to do it, I assume this sort of “reverse” spin has some advantage. I can’t quite figure out how, though.
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Cé hé sin
> Brickman
06/14/2015 at 05:06 |
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An opoc engine - opposed piston opposed cylinder
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Slave2anMG
> tromoly
06/14/2015 at 10:47 |
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No worries :) I visit a lot of engineering firms with young engineers on staff specifically to give them some basic lessons in pump realities :)
Probably didn’t tell you in Fluids that you can close a valve against a centrifugal pump for some fairly short period of time, eg ‘deadhead’ the pump. All the pump will do is spin in the fluid and generate heat...that heat is what dictates the length of time it can be deadheaded. But close a valve against a positive displacement pump...bad things happen. Something will break, someplace...the motor might simply stall but usually something else bad happens. The fluid is incompressible and as the PD pump is displacing the fluid...it’s gonna go someplace and will find the weakest part of the system downstream if the pump’s drive doesn’t stall or fail. I’ve seen the aftermath...fittings on pipes blow apart, stainless tubing ruptures at a weak weld...even saw a 150 pound pump cover blown off, shot across the room and stuck into a cinder block wall :)