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Post by Johansson on Jan 23, 2024 15:45:19 GMT -5
I think my neighbour would be quicker than me out the door when that happens, I am battle hardened when it comes to catastrophic failures... *LOL*
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richardm
Senior Member
Joined: June 2022
Posts: 338
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Post by richardm on Jan 23, 2024 16:46:42 GMT -5
Why is that ? Not your first ? LOL!
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Post by Johansson on Jan 24, 2024 16:23:38 GMT -5
Nothing beats a couple of hours in a workshop 2 degrees above freezing, it is time to call it a night when you stop feeling your fingertips... It was time to make the diffuser straightening vanes, 32 of them to be exact. I scribed the marking for the hacksaw on the diffuser rim and made a test vane from the 3D template I made last night. I then cut 15mm deep slots in the rim and test fitted a vane, I will add a slight bend to it later to meet the air in a better angle. I use a vertical band saw for wood to cut the vanes from 5mm aluminum, it works great with a metal blade fitted. I made all 32 vanes tonight, will mill the inlet side and bend them later. /Anders
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Post by andym on Jan 24, 2024 16:30:38 GMT -5
Nice..... you are realy work at some speed on this
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Post by Johansson on Jan 24, 2024 16:39:40 GMT -5
An hour here and there, and it helps that this kind of work is what I´ve been getting payed for the last 6-7 years. No miniature parts or super important measurements, just common sense and a hacksaw. I´ve decided to drop the idea with a variable NGV, that will save me lots of time. It cannot be done without making the whole NGV bulkier and weaker, and I need it solid since it is an integral part of the engine. If nothing unexpected happens I think I will have it ready for a first test spin this summer, that will be exciting to say the least.
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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: 236
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Post by ripp on Jan 25, 2024 2:28:11 GMT -5
Hi Anders,
NGV : will it be the usual 30° angle?
Ralph
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Post by Johansson on Jan 25, 2024 15:33:23 GMT -5
John did some calcs for me: --------- Yep , ~4 inch ( 105mm) blades and 10,000 rpm
I used 1050K -777C for TIT with ~1.36 PR going into the NGV , 1.5 PR from comp .
With a 1.2 PR across the NGV and 1.16 PR across wheel .
NGV angle ~33 degrees outlet with ~122 sq inches of throat area .
The ~600 ft/sec of inlet flow into wheel combined with the 1.16 PR expansion needs a wheel exducer angle of ~38 degrees with a throat area of ~130 sq inches .
Exhaust at ~700 ft/sec at 22 lbs/sec gives 478 lbs of thrust 😊--------- In the future there needs to be a statue raised for John, no man has done more for the DIY turbine community than he has. He has helped me endlessly during the years and still do, since I am more of a doer than a number puncher.
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Post by andym on Jan 25, 2024 16:15:39 GMT -5
John did some calcs for me: --------- Yep , ~4 inch ( 105mm) blades and 10,000 rpm
I used 1050K -777C for TIT with ~1.36 PR going into the NGV , 1.5 PR from comp .
With a 1.2 PR across the NGV and 1.16 PR across wheel .
NGV angle ~33 degrees outlet with ~122 sq inches of throat area .
The ~600 ft/sec of inlet flow into wheel combined with the 1.16 PR expansion needs a wheel exducer angle of ~38 degrees with a throat area of ~130 sq inches .
Exhaust at ~700 ft/sec at 22 lbs/sec gives 478 lbs of thrust 😊--------- In the future there needs to be a statue raised for John, no man has done more for the DIY turbine community than he has. He has helped me endlessly during the years and still do, since I am more of a doer than a number puncher. I second that Anders .... Many dont know... I was done..... not building any more engines..... health was getting in the way...... So John sent me a paper weight.... A 130mm comp wheel...... we all know how that went..... Yes I would of lost my mind not having a project..... Thank You John
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Post by wannabebuilderuk on Jan 25, 2024 16:28:23 GMT -5
Without John's knowledge we simply wouldn't know where to begin on calculations, when we lose that it'll be like going back to the stone age!
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Post by racket on Jan 25, 2024 16:43:19 GMT -5
LOL.............well guys , maybe we need to have that uncomfortable talk about "Succession" .
Mike Early sorta left things to me .
Heh heh ..............who wants to take over ...............hands up please :-)
LOL......maybe I should contact Colin Furze to see if he'd be interested in taking the job , he knows everything about making turbines ;-)
Sorry guys for being cheeky, I don't cope well with compliments ................ relax , I'll be here for as long as I can tap away at this keyboard :-)
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Post by Johansson on Jan 26, 2024 12:39:48 GMT -5
With mr Furze as our guru I fear that the death rate in our community will humble even the Ukraine war.... Anyway, big day today! A friend of mine helped me to laser cut the turbine blade sections out of 3mm stainless. The plan is to make a press jig to make the blade profiling, then heat the root and twist the blades to their final shape. Some edge grinding and they are finished. They will be bolted to the centrum hub that I made earlier, if this works I have found a really cheap and simple way for us to make large axial turbine wheels. Cheers! /Anders
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Post by finiteparts on Jan 26, 2024 16:13:10 GMT -5
Amazing progress. As always, your work is first class.
Do you have a scale where you could grab a weight of those blades? And what will the diameter of the bolt circle? I just want to do a sanity check on the forces that you will get on your wheel. I don't know if rotating at 10krpm is that a crazy amount of energy or just a "normal" level of force/stress.
- Chris
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Post by Johansson on Jan 27, 2024 2:31:48 GMT -5
Thanks! For these parts I just stood scratching my belly button while my friend ran the laser, but I couldn´t resist spending 5 minutes on the laser instead of a week in the workshop. I will do that when I get back home, I am visiting my parents this weekend to shovel snow. Thanks for helping me with it! /Anders
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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: 236
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Post by ripp on Jan 27, 2024 3:19:37 GMT -5
John did some calcs for me: --------- Yep , ~4 inch ( 105mm) blades and 10,000 rpm
I used 1050K -777C for TIT with ~1.36 PR going into the NGV , 1.5 PR from comp .
With a 1.2 PR across the NGV and 1.16 PR across wheel .
NGV angle ~33 degrees outlet with ~122 sq inches of throat area .
The ~600 ft/sec of inlet flow into wheel combined with the 1.16 PR expansion needs a wheel exducer angle of ~38 degrees with a throat area of ~130 sq inches .
Exhaust at ~700 ft/sec at 22 lbs/sec gives 478 lbs of thrust 😊--------- In the future there needs to be a statue raised for John, no man has done more for the DIY turbine community than he has. He has helped me endlessly during the years and still do, since I am more of a doer than a number puncher. Hi Anders, thanks for the data! I hope Chris can give the all-clear that the turbine wheel is safe. Ralph
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Post by andym on Jan 27, 2024 4:33:33 GMT -5
Its coming together so fast.... and looking so good
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