76/86 Turbojet

[stoffe64]

hello an update of my project!
i recently stumbeled into something very interesting on the DIY group gasturbines, it was about an anular combustor on a turbocharger turbojet, i asked the man responsible for that post if there were any drawings of that thing, THEN he simply sat down AND made a drawing of it for my compressor inducer as well , absolutely fantastic so now i decided to give it a go with that!!
I SIMPLY HAVE TOO!!, THANKS MATE!!
cheers/stephan

[Johansson]

That´s great news!

Just out of curiosity, how are you planning to fit an annular combustor to a turbocharger based gas turbine?

[stoffe64]

in the drawing i got it fits to the turbo scroll and it in free space on the top of combustor, i can send the drawing if you want it?

[stoffe64]

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here is the drawing i got, i hope it is to help for you Anders!

[Johansson]

Ok, the downside is that the routing of the compressor air duct will be very long since it has to do an 180° turn before entering the combustor.

My 5 cents, stick with a normal can combustor calculated from JetSpecs. You will have plenty of time to try new stuff later when you have the engine up and running, nothing good have ever come from over-complicating things from the start.

Cheers!
/Anders

[racket]

Hi Stephan

LOL......I have to agree with Anders about sticking with a "standard" setup for a first build, even though my drawing is "interesting" , it will require a lot more work to make :-)

Cheers
John

[Johansson]

Looking forward to some pics of the combustor build, I think it will turn out great no matter what style of combustor you decide to use.

[stoffe64]

hello everyone!
i make an update here,as you all know i got theese wonderful drawings from john (the turbine guru) and i started to look into that annular combustor setup versus can combustor setup, i have finally decided to go with the normal can combustor setup(although,i still look into the annular version, one day i will try that one too!!)
i have also dived into my purse and purchased an oil pump for the scaniaten(finally),it is a Piusi pump 12vdc max flow 11,5 liters per minut, max pressure 5,5 bar, i think and i hope it will be enough flow/pressure for my engine...a question to you experienced guys!...how large oil line up to the turbo?, the outlet of pump is R 3/4"...should i opt for that all the way to turbo or is 1/2" lines enough?
cheers/stephan

[racket]

Hi Stephan

As long as your oil pressure measured at the turbo oil inlet is within design limits then the plumbing is adequate , 1/2" OD metal tubing of ~3/8" ID should be adequate , but in your very cold climate you may need to do some flow testing to make sure .

I only used 1/2" OD copper plumbing on the GT6041

Cheers
John

[stoffe64]

hello John!
i thought also that 1/2" lines would be fine, so you used copper plumbing?, i was thinking about stainless plumbing but thats maybe overkill?....i have the pipes for it but need to get plumbing fittings suitable for the job!
cheers/stephan

[racket]

Hi Stephan

Copper tubing and compression fittings are readily available from plumbing suppliers at very reasonable prices and with a quick spray of silver paint they look as good as stainless :-)

Annealed copper tubing is easy to bend into the required shape and is more than good enough for prototype builds , stainless is nice but expensive , my budget is generally kinda stretched so if I can save some money I'll do it .

Cheers
John

[stoffe64]

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thin is the stainless M16X1,5 pipe fitting and stainless oil line with 12mm OD and 10mm ID
cheers/stephan

[stoffe64]

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this is the oil filter i intend to use, it is made by the PARKER filtration company,it is a hydraulic oil filter originally but i think it will be suitable here as well!
cheers/stephan

[racket]

Hi Stephan

A couple of suggestions that might be worth thinking about ..........

With your oil inlet difficulties perhaps rotating the centre housing 30 degrees so that the oil inlet could be fitted more easily , its not necessary to have the inlet exactly at the top , it can go to 30 degrees either way and still provide positive drainage .

The flametube can have swirl vanes around the fuel injector and other air entry points in the end cap to improve mixing of air/fuel and combustion , you'll need to be very careful about the size/area of those holes in the "standoff" cap, I'd be thinking more towards just having 4 strong compression springs mounted on suitable length spigots , out on the edge of the can to push it into the slipjoint , also have the fuel coming in from the side wall of the combustor so that it can be easily fitted before fitting the "lid" with its delivery pipe .

Cheers
John

[stoffe64]

AHA ....you think it is better off with that cap on the top of flametube/burner liner?...i see , well it is a similar thing with holes for the air to go thrue at the slipjoint as well before it reaches the flametube side holes, i was thinking about either swirler vanes or small holes on top of flametube lid OR both IF necessary!
hmmm, yes maybe it would be better to have the fuel entry on the side as you said,maybe possible to have the ignition system there as well,next to the fuel injector?,i was thinkingabout a glow plug there really
spring loaded huh ,i guess you mean spring loaded by the bottom of flame tube so it presses flame tube up against slipjoint/combustor air entrytoplid there?
i guess i have to make a similar drawing of theese mods to show you John so we understand eachother correctly
cheers/stephan