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Post by racket on Jan 15, 2018 18:41:49 GMT -5
Hi Anders
Words fail me :-(
Thats gunna scare a lotta people .
Design temp rise ~1,500 C degrees with exhaust velocity up near 550 m/s ;-)
Cheers John
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barnyard
Member
Joined: October 2016
Posts: 36
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Post by barnyard on Jan 15, 2018 19:02:55 GMT -5
Excellent build Anders! The projects you guys can accomplish with your spare time is impressive! It’s inspiring to a lot of people I’m sure:)
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Jan 16, 2018 16:00:41 GMT -5
Jesus Christ Anders! WOW... Astonishing work!
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Post by Johansson on Jan 16, 2018 16:13:18 GMT -5
Thanks! Getting the afterburner installed sure helps visualize how we have planned the build, another piece of the puzzle in place so to speak. That exhaust diameter at full afterburn and 550m/s, I am looking forward to it! Cheers! /Anders
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Jan 16, 2018 16:35:04 GMT -5
Hi Anders So... So very impressive.... All The Best Andy
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Post by Johansson on Jan 17, 2018 17:41:39 GMT -5
Another day, another couple of hours working on the Iceliner. First I had to spend two hours shoveling snow though, it has been pouring down here lately. Anyway, once the driveway was cleared and the kids put to bed I started making the interstage ducts from the gas producers. The flexible stainless exhaust pipe is very useful, it will take up the heat expansion when the engine is running and it is a bit forgiving when cutting the pipe ends at the right angles. The front engine duct is also on its way, I need to give the straight section of pipe a bit of sanding down later since the rest of the duct is so darn shiny. Cheers! /Anders
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Post by turboron on Jan 17, 2018 17:48:35 GMT -5
Anders, where did you source the stainless steel flexible tubing. It looks to big for truck stuff. Diameter?
Thanks, Ron
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Post by Johansson on Jan 17, 2018 17:51:29 GMT -5
It was Olov who bought it, I´ll ask him next time I talk to him. It is 4" diameter.
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Jan 17, 2018 19:08:30 GMT -5
Nice :-)
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Chuks
Senior Member
Joined: August 2015
Posts: 498
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Post by Chuks on Jan 18, 2018 19:59:44 GMT -5
Oh my God!!! Anders, is there a thing in the world you can't do better? Keep the build going.
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Post by finiteparts on Jan 18, 2018 21:20:10 GMT -5
Anders, The build is looking great as always. I thought that I might throw a word of caution in because I would hate to see the tubing blow out and ruin your run. You might want to be careful if that is just exhaust flex hosing, as it is not really pressure rated. You might have a low enough pressure feeding the LP turbine, but my guess is that you are high enough pressure that you would need to use a version that has a high temperature packing and maybe that is what you have...I can't tell from the photos. When I worked at a Navistar dealership, we sold it by the foot and we sold a lot of it. When we installed it, we were limited to uses downstream of the turbo though, because it does not have a lot of pressure capability. If you do a quick search on "spiral wound metal hose" or "interlocked flexible metal pipe" you will see that it is generally considered to not be "pressure tight", without the use of a packing. www.hosefittingsinc.com/assets/files/hose/hosemaster-catalog.pdf see page 48 This should be kept in mind for anyone thinking of using this. It would not be appropriate to use this tubing upstream of the turbine first stage and it may leak even between the HP and LP stage. Here is another source of technical information...see pages 6-7 for the "INTERLOCKED EXHAUST HOSE" www.penflex.com/wp-content/uploads/Penflex_Interlock_Hose.pdfThe fact that no pressure rating is given, seems to indicate that it not very good for pressure applications. Ron, Any large truck dealership parts department should have 4 inch to 6 inch diameter exhaust flex tubing in stock. If you have a Fleet Pride in your area, you could also get it there...here is a link to the catalog showing what they sell... fleetpride.com/wp-content/npc2018/#369/zOf course that assumes that you don't need any real pressure capability. - Chris
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Post by Johansson on Jan 20, 2018 14:33:10 GMT -5
Chris: That is a very valid question, the exhaust hose is a high quality stainless variant rated for 600+°C so if there is a flexible hose that is up for the job it should be this one.
I discussed your post with Olov today, with the low 2-ish bar P2 the gas producers will run at there won´t be an excessive pressure in the interstage duct so we will keep our fingers crossed and both eyes on the hose once we start the engines to watch for any signs of leakage.
Cheers! /Anders
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Post by racket on Jan 20, 2018 17:42:36 GMT -5
Hi Anders
There should be ~0.75 Bar total pressure downstream of the gas producers , probably ~0.3 Bar of dynamic with that sized flexible pipe , and 0.45 Bar static pressure ............LOL, there'd better be otherwise you won't be spinning that fan very fast ;-)
Cheers John
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Feathers
Veteran Member
Joined: August 2010
Posts: 169
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Post by Feathers on Jan 22, 2018 12:27:54 GMT -5
Hi Anders, Our group actually ran a test with some 5" OD SS flexible tubing like what you've used. On interstage pressure it holds up mechanically just fine, but leaks like a sieve! I think that for your build it should be perfect, I would just avoid putting yourself in the same compartment. Cheers, Feathers
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Post by Johansson on Jan 26, 2018 13:53:41 GMT -5
We´ll make sure to check the hose for signs of leaks once we start the gas producers, if so we will replace most of the hose with stainless tubing to minimize the leakage. I have started to work on a stainless cradle mount for the afterburner. I will drill the chassis to weld in threaded bungs that the mount will be fitted to, and some kind of clamp that goes over the afterburner duct and keeps it from bouncing around at speed. All this without putting any radial pressure on the afterburner since it would deform when heated up. Cheers! /Anders
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