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Post by jetjeff on Feb 22, 2016 16:17:50 GMT -5
After completing my last build (I haven't even tried running it yet), I've decided to build another turbine. For this one, I'll follow Schreckling build principals, except for the compressor which I intend to use 100% carbon fiber instead of plywood. The base disk was laminated using 6 layers of 9.5 oz cloth rotating the fiber strand orientation 45 degree's to the previous layer. The blades will be vacuum bagged against a 1/2 piece of 4.5" PVC pipe. The top disk will have to be vacuum bagged also. This is my progress so far.
Jeff
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Post by jetjeff on Feb 22, 2016 16:18:39 GMT -5
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Post by Johansson on Feb 22, 2016 17:56:17 GMT -5
Very interesting!
Concerning DIY centrifugal compressors, have you perchance seen the Swedish guy Axel Borg and his latest creation, a partially 3D printed jet engine similar to the Schreckling turbine? The compressor wheel is printed in PLA plastic and has survived +40.000rpm!
The turbine housing is cast in refractory cement, probably just to prove that it can be done, a very cool project IMHO.
Cheers!
/Anders
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Post by frankenhealey on Feb 23, 2016 5:26:22 GMT -5
Amazing!
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Post by jetjeff on Mar 5, 2016 1:14:55 GMT -5
That 3D printed jet engine is amazing, thanks for posting the link. While searching YouTube, somebody is developing a 3D printer that uses carbon fiber. Here is a picture of my progress on the base disk for the impeller. Routing the curved .040" slots was not an easy task. I ended up making a jig using 1/2" think Delrin, and using a Dremel with router base and a .040" end-mill as a router bit. Jeff  |
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Post by jetjeff on Mar 6, 2016 8:26:26 GMT -5
Here is a pic of the base disk plus the blades, and aluminum hub. Also shown is the male mold (black Delrin) I'll use to vacuum bag the top disk. It weighs about .1 lbs, it should come out at least 50% lighter than a turbocharger impeller, I know it won't be nearly efficient as a turbocharger impeller. Jeff  |
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Post by jetjeff on Mar 21, 2016 3:26:40 GMT -5
Some progress was made on the compressor over last weekend. I cut the slots in the top disk with my rotary turntable on my Bridgeport. Due to the slope of the disk, it was impossible to do with my Dremel router base and jig. The top disk still sits too high, have to sand the blades to get it to 3/8" exit blade height. Jeff  |
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Post by jetjeff on Mar 28, 2016 2:42:18 GMT -5
Some more progress was made on the turbine. The compressor assembly was epoxied together using West System resin and extra slow hardener. I've started work on a Kamps type N.G.V. I'm also considering building the Schreckling type too. If the Schreckling is used, it will be have to be mounted inside the mini keg, otherwise the shaft would have to be too long. Jeff  |
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Post by jetjeff on Mar 28, 2016 2:55:17 GMT -5
The compressor has a ring (7/32") of undisturbed carbon fiber for strength. I guess I could also remove material from the area for balancing. Jeff  |
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ripp
Veteran Member
I'm sorry, I don't speak english, so I torment you (and myself) with a translation program,Sorry
Joined: January 2013
Posts: 230
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Post by ripp on Mar 28, 2016 3:59:57 GMT -5
Hi Jeff,
very interesting Project!
Please increase the pixel of the Images.
I can not see any details very well.
Thank you very much
Ralph
translate.google.at
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Post by jetjeff on Mar 30, 2016 3:23:08 GMT -5
Ralph, Here are additional pictures, hopefully higher resolution. Jeff   |
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Post by jetjeff on Apr 4, 2016 3:39:38 GMT -5
Some more progress was made on the turbine. The N.G.V. blades (321 stainless) were welded to the inner ring. The original inner ring has 11 blades and there wasn't enough overlap of the blades, so I made a 2nd one using 12 blades. I made a 'claw tool' for twisting the turbine blades from 4140 chrome moly bar. Jeff  |
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Post by jetjeff on Apr 5, 2016 3:37:00 GMT -5
These pictures show how I twist the turbine blades without bending the blades axially and how bad things warped after welding the NGV blades to the inner ring. Jeff   |
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Post by jetjeff on Apr 8, 2016 1:37:21 GMT -5
The N.G.V. with tunnel guide (part # 11.2 from the Kamps book) machined, ready to be welded and a pic of the mold I used to make the compressor blades. I'd have to agree with other people on this forum, the N.G.V. is one of the more challenging, time consuming parts to make. Jeff   |
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Post by jetjeff on Apr 10, 2016 0:26:53 GMT -5
The tunnel flange has been welded to the inner ring. The guy that does my TIG welding worked for Williams International, so he is a very good source for questions regarding turbines. Also shown is a pic on how to very accurately open a tin can,,,lol. Jeff   |
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