|
|
Post by Johansson on Apr 15, 2011 0:39:12 GMT -5
That is a very good question, a steel ring would of course be better than copper since I won´t have to make a transition to a steel tube inside the engine. It never crossed my mind in fact. The only hard soldering I have done earlier was not pretty, but then I never used any fluss so I guess that was part of the problem. I´ll have to give it a try since you say it is so easy.  |
|
|
|
Post by racket on Apr 15, 2011 2:10:44 GMT -5
Hi Anders
I used a length of 1/4" dia steel brake line for the circular manifold fed by a "main" of 3/16"steel brake line , the larger diameter for the circular section was to reduce fluid velocities and hopefully to produce a more even distribution of fuel to the injectors , all injectors had their entry on the downstream side of the flow for consistency .
The "zinc??" coating on the brakeline bonds very well to the silver solder , but you do need that high silver content solder and its appropriate flux , the silver solder cost ~$8 for a piece of 1/16" dia by ~600mm long , its expensive but does a beautiful job on stainless , it flows like butter on a hot knife :-)
Don't use the prefluxed/coated silver solder , you need the plain bare type and a "pile" of flux around the injector to keep it cool and stop it burning and going black and unsolderable , the length of stainless injector outside the flux "pile" will be very quickly overheated and go black and be "soft" after cool down and easily bent if handled roughly .
Cheers
John
|
|
|
|
Post by turbochris on Apr 15, 2011 9:40:21 GMT -5
hey Man,
I'm serious about visiting you on the next speed week. How could I deprive myself of such a thing? I just need some dates and the name of the airport to fly into. What is your email address? We should carry this off list. Who else is going?!?!?!? turbochris at krugtech dot com (bot proof geek method of displaying email on public form)
Unlike some of this TV show crap, I'll actually have time to prepare for this.
it will be epic..........
|
|
|
|
Post by Johansson on Apr 15, 2011 12:54:09 GMT -5
hey Man, I'm serious about visiting you on the next speed week. How could I deprive myself of such a thing? I just need some dates and the name of the airport to fly into. What is your email address? We should carry this off list. Who else is going?!?!?!? turbochris at krugtech dot com (bot proof geek method of displaying email on public form) Unlike some of this TV show crap, I'll actually have time to prepare for this. it will be epic.......... You are welcome, I´ll send you a mail about the dates and so on. =) |
|
|
|
Post by Johansson on Apr 16, 2011 9:25:23 GMT -5
|
|
|
|
Post by turbochris on Apr 16, 2011 10:53:09 GMT -5
Please don't blow that thing up until I get there!
|
|
|
|
Post by Johansson on Apr 16, 2011 11:19:15 GMT -5
Please don't blow that thing up until I get there! Cannot promise you that, I aim for a test run this summer. |
|
|
|
Post by turbochris on Apr 16, 2011 13:47:47 GMT -5
don't forget the video!
|
|
|
|
Post by racket on Apr 16, 2011 17:20:24 GMT -5
Hi Anders
Thats nicely done :-))
Fits in very neatly
Cheers
John
|
|
|
|
Post by Johansson on Apr 16, 2011 17:32:07 GMT -5
Hi Anders Thats nicely done :-)) Fits in very neatly Cheers John Thanks, I was worried you would say something like the tube diameter is way too small and it would neeeeever work. Just forget it, booooy. ;D A nice snug fit, just the way I like it.  |
|
|
|
Post by racket on Apr 16, 2011 21:02:26 GMT -5
Hi Anders
LOL......I'd never be that unkind/ blunt ;-)
But ......heh heh heh , I'll be gentle here .......... have you considered the expansion changes in diameters between the NGV and fuel manifold , the steel NGV at say 700 deg C will expand diametrically ~2 mm , the fuel cooled manifold might not change much from ambiant conditions ...............you'll notice I used thin stainless sheeting bent to provide a flexible mounting between my high expansion rate stainless NGV/wall and the fuel ring as I'd have had >3mm diametric expansion , I hope you have clearance between the fuel manifold and the "step" on your NGV otherwise once the NGV expands it could burst your manifold with potentially destructive consequences :-(
Now that wasn't too bad was it ;-)
Cheers
John
|
|
|
|
Post by Johansson on Apr 17, 2011 1:00:08 GMT -5
That was a gentle hint indeed. There is not that much room between the fuel ring and the turbine shroud, perhaps I should shave some material off the outer diameter of the shroud just to be sure? |
|
|
|
Post by racket on Apr 17, 2011 17:38:27 GMT -5
Hi Anders
LOL......... its the "grandfather" in me coming out ;-)
As long as you have have 4mm diametric clearance between turb shroud step and fuel ring you should be OK :-))
Though your fuel ring mounts from the larger NGV diameter will still tend to "pull" the fuel ring into a larger diameter , putting stresses on it , I'd be removing some of them , 3 mounts would be enough and will allow the ring more "flex" between mounts , .............the micro turbines have their fuel rings mounted rather flexibly even though they a very small in diameter with less expansionary changes .............food for thought :-)
Cheers
John
|
|
|
|
Post by Johansson on Apr 18, 2011 10:01:11 GMT -5
I´ve thought about the outer mounts and how much the ring will be stretched, the "problem" with removing all but three mounts is that it will disrupt the harmony and overall aestetic balance inside the engine since the space between the mounts won´t be even any longer. I´ll mill a groove in the turbine exducer shroud to get the right clearance for the fuel ring, will have to think a bit about the pulling issue. |
|
|
|
Post by turbochris on Apr 18, 2011 17:10:41 GMT -5
I hate that aestetic balance problem. It hangs me up all the time! I just have a beer then i get a second opinion on the matter from myself and get back to work.
|
|
