Wacky Weird and Way-unconventional idea
Posted: Thu Sep 11, 2008 8:44 pm
First off a disclaimer: I dont know what I'm doing.
Background: I get 3-5 days in the shop a month now and want to get back into jets; got my AA in machining and Machinist practices and have access to a mini lathe, minimill, mig welder and some standard shop tools.
I'm an Aerospace Engr student, currently transferring schools to get a better education. Just swapped majors from Mechanical Engr so not too many principals are familiar to me.
What I want to accomplish: I once built a turbine, it was beyond amazing to me. Done a few ramjets they are fun, and one crappy pulsejet that doesnt work well. I want to re-invent the wheel, just for me!! No reason I dont/wouldn't build a standard jet, this is just to satisfy my curiosity. So I want to do something new and exciting, something weird just to stamp my name on it and say "im just as surprized you are it works..."
Idea#1
Incorporate a vane compressor into a small turbine to improve comrpession.
On the computer at work so a picture will have to wait until tonight, but for now:
A rotary vane compressor is a simple device to make pressurized air. My idea is for the Compressor from a cars turbocharger feeds into the rotary vane compressor, that feeds into the combustion chamber which pushes the turbine completing the process. The rotary vane comrpessor would have to be geared down and offset slightly, so here is where my idea gets laughed at.
I think you can have a ring and sun gear to downgear the RVC from the shaft, and since it is offset and spits air out the side...the combustion chamber would be off to the side of the RVC. I assume since the CC of a regular small turbine is a good portion of the jets girth that the CC for this jet would also have to be quite large. It would be fugly but it just might work.
So the front of the jet looks like a turbocharger, compressor spools air into a pipe like in a turbo as opposed to a standard Centri-flow jet where it enters an axial [kinda] flow and is shot straight back into the CC. Instead this pipe is bent into the vane compressor. The RVC will intake from the flat side but exhaust from the rounded side. The large CC will intake from the rounded side and shoot straight back out, towards the turbine which is designed like the intake.
So the air does some freaky twists and turns but the jet itself is reasonably cyllindrical in shape.
Gearing the RVC to the main shaft. The shaft will have a gear, sun gear on it if you will. The shaft of the RVC will be a hollow pipe with a ring gear (teeth on the inside of the ring). The large hollow pipe will have bearings at each side of its housing, which the main shaft will pass through. The main shaft has its own set of bearings attached to the compressor and turbine housings. So essentially there is an offset bearing that is wide enough for the main shaft to pass through uninterupted. So even though they are geared together and offset they dont wiggle in any way. This allows me to gear down the RVC because I dont think it should spin anywhere near as fast as the Turbine.
Lube is important!! For the RVC to have a long successful life it needs lube. I imagine it can self aspiriate by placing a tube where the compressor feeds into the RVC, the fast moving turbulent air should suck enough oil to keep the RCV sealed up tight!
I sureleft many thing out but work is buggin me so I'll post back later
[was not spell checked ]
*slightly edited in my spare time so it appears I speak english*
Background: I get 3-5 days in the shop a month now and want to get back into jets; got my AA in machining and Machinist practices and have access to a mini lathe, minimill, mig welder and some standard shop tools.
I'm an Aerospace Engr student, currently transferring schools to get a better education. Just swapped majors from Mechanical Engr so not too many principals are familiar to me.
What I want to accomplish: I once built a turbine, it was beyond amazing to me. Done a few ramjets they are fun, and one crappy pulsejet that doesnt work well. I want to re-invent the wheel, just for me!! No reason I dont/wouldn't build a standard jet, this is just to satisfy my curiosity. So I want to do something new and exciting, something weird just to stamp my name on it and say "im just as surprized you are it works..."
Idea#1
Incorporate a vane compressor into a small turbine to improve comrpession.
On the computer at work so a picture will have to wait until tonight, but for now:
A rotary vane compressor is a simple device to make pressurized air. My idea is for the Compressor from a cars turbocharger feeds into the rotary vane compressor, that feeds into the combustion chamber which pushes the turbine completing the process. The rotary vane comrpessor would have to be geared down and offset slightly, so here is where my idea gets laughed at.
I think you can have a ring and sun gear to downgear the RVC from the shaft, and since it is offset and spits air out the side...the combustion chamber would be off to the side of the RVC. I assume since the CC of a regular small turbine is a good portion of the jets girth that the CC for this jet would also have to be quite large. It would be fugly but it just might work.
So the front of the jet looks like a turbocharger, compressor spools air into a pipe like in a turbo as opposed to a standard Centri-flow jet where it enters an axial [kinda] flow and is shot straight back into the CC. Instead this pipe is bent into the vane compressor. The RVC will intake from the flat side but exhaust from the rounded side. The large CC will intake from the rounded side and shoot straight back out, towards the turbine which is designed like the intake.
So the air does some freaky twists and turns but the jet itself is reasonably cyllindrical in shape.
Gearing the RVC to the main shaft. The shaft will have a gear, sun gear on it if you will. The shaft of the RVC will be a hollow pipe with a ring gear (teeth on the inside of the ring). The large hollow pipe will have bearings at each side of its housing, which the main shaft will pass through. The main shaft has its own set of bearings attached to the compressor and turbine housings. So essentially there is an offset bearing that is wide enough for the main shaft to pass through uninterupted. So even though they are geared together and offset they dont wiggle in any way. This allows me to gear down the RVC because I dont think it should spin anywhere near as fast as the Turbine.
Lube is important!! For the RVC to have a long successful life it needs lube. I imagine it can self aspiriate by placing a tube where the compressor feeds into the RVC, the fast moving turbulent air should suck enough oil to keep the RCV sealed up tight!
I sureleft many thing out but work is buggin me so I'll post back later
[was not spell checked ]
*slightly edited in my spare time so it appears I speak english*