My project

[richardm]

Here are some more pictures..

[andym]

Very nice work....

[richardm]

Thank you Andy! All done with "basic" tools lathe and milling machine. And none of this has ever been my trade.. Just taking my time Lots of it ..

Be well!

[sputnik]

That looks great. Out of interest what are your turbo specs?

[jetmanjoe]

Sept 22, 2023 17:45:40 GMT -5 richardm said:

Here are some more pictures..

Hi Richard,

I'm curious as to where you came up with you flame tube design with the fuel swirl nozzle? and is that part of a fireplace flue slip joint I see in there too? Would love some more detailed pictures and info.

[richardm]

Hi ! The swirl vanes are home made from stainless tubing and sheet The fuel nozzle is located in the middle hole so that the assembly acts as a nozzle holder.This while thing is inspired from the old combusts used on early jet engines.
And combustion liner is also home made of stainless sheet The "slip" joint was made using a bead making machine fitted with crimping rollers. Those pieces are actually welded together. The purpose is not to allow it to slide into each other but to let cooling air feed in and keep the liner cooler.

The entire liner assembly is held in place by fitting in the turbo exhaust flange at one end. and by the fuel nozzle fitting at the opposite end so that it can expand freely. The igniter fitting completes the liner holding arrangement.

I m not good at posting stuff on this site. Computers and me are like dogs and cats....
I will try to post more relevant pictures in my next post Look for em.

Cheers!

Richard

[jetmanjoe]

It looks mint, I'm in the process of designing mine and I was reading up about fuel nozzle swirl rings and how it increased burn efficiency. Now that I've seen yours I want one lol. Mint build and quality by the way.

[richardm]

Thanks
Hers how I made mine: The outer tube is a piece of thick stainless tubing turned down to its 'bell mouth" shape * slots were made at an angle with a slitting saw ( could use an end mill too but at this size they re quite fragile)
The center hub is from a round stainless bar drilled to the size you need to accept your nozzle. Again 8 slots a cut at the same angle than the outer casing
8 pieces of stainless thin flat are cut so that the liner end fits the slot Same on the outer end .

I don't remember the angle It think it was 15 degrees or so

Everything is put together and big welded on the outside of the outer casing' filling the gaps and then grinded.

The center needs no welding .It's simply locked in place by the vanes. The final assembly has been sand blasted to clean it up after welding ( Actually more like to get an even color...)

Don't forget to account for its area when calculating your primary air flow although its a little bit tricky because of the restriction caused by the vanes

Good luck with yours Nee a little material and quite a bit of work

[jetmanjoe]

I was wondering if you included the swirl vane in the primary calculations. Can't wait to see how it performs.

[racket]

Yep , its important to have the right swirler configuration, I cheated with mine jetandturbineowners.proboards.com/thread/1366/tv84-turbine-bike by using a ready made one from a steam boiler oil burner which was then welded to the boss which held the flametube in position , the fuel nozzle was positioned within the boss with air entering the boss radially and passing out axially around the nozzle to centralise the spray , the hole out of the boss was smaller in diameter than the spray nozzle to prevent it ever falling into the flametube and going into the turbine.

Flow area through the swirler should account for ~10% of total flametube air hole area or ~1/3rd of Primary air hole area , my swirler had 12 vanes with 9 X 5 mm flow areas = 540 sq mms , with an 88 mm inducer of 6082 sq mms , it was 8.8% ..............I always felt it produced a too "flat" a swirl because of the flametube condition after lotsa use .

LOL, 30 years on , I'd probably make it a tad different :-)

Cheers
John

[jetmanjoe]

Thanks John for the info. Lol back to the drawing board before I even attempted to build something like this.

[richardm]

Oct 30, 2023 18:08:48 GMT -5 jetmanjoe said:

I was wondering if you included the swirl vane in the primary calculations. Can't wait to see how it performs.

[noshell]

Cant wait to see this run

[richardm]

Not til next spring I guess Currently working on the fuel system. Then i'll turn to instrumentation and control