building a jet engine from a turbo-charger

[vineeth]

Hi friends iam vineeth a newbie to this field I have planed to build an jet engine using a 5.7L turbo charger serviced and replaced with new parts.. I have pined few pics of the turbo charger..
Inducer dia:50mm






I have used jetspecs2.0 for calculating the flame tube diameter here are the results ( i have used random diameter for sizing of holes please correct it if i have choosed it wrong)
length ratios are:
25% L of flame tube for primary zone (3 divisions equally spaced for 13mm)
50% L of flame tube for secondary zone
75% L of flame tube for tertiary zone






image uploading site

I have few question on selecting sheet metal material and its thickness used in building on below mentioned parts:

1.combustor casing

2.flame tube

3.pipe that connect the combustor and turbine housing  
I have also designed one propane spray nozzle having 5 radial holes of 1mm @80 degree and 1 axial hole of 0.5mm with exit divergence angle of 70 degree…I have designed it for first time so I don’t know whether it will be sufficient holes for propane delivery (8kg propane tank).







If I’m going wrong direction in design please support me to correct it..

And sorry if i'm technically wrong in any of my above conversation.

Thanks in advance….

[racket]

Hi Vineeth

Firstly , use larger and fewer holes in the Primary Zone , try 5mm dia .

Secondly , your fuel injector must only have radial holes , NO axial hole , and have a minimum of 8 radial ones.

Thirdly , sheeting thickness , as you're using propane the flametube diameter can be reduced a bit , maybe 5 inch and outer can 6-7 inch , minimum sheet for flametube is 1 mm stainless if you want any length of life , though 3 mm mild steel will also be OK , the outer can being a pressure vessel needs strength rather than resistance to burning out so use 1.6 mm steel tubing or a thin walled 7" dia stainless steel fire extinguisher , connecting tubes between compressor and combustor can be relatively thin as their diameter isn't that great , between combustor and turb scroll it needs to be thicker , exhaust pipe tubing ~1.6 mm WT.

Cheers
John

[vineeth]

Hii John ,
1.After altering the flame tube dia from 6 to 5 inch should I alter the length of the flame tube or let it be the same?
2.And I wanted to know the sizes of holes which can be used in secondary and dilution zone .
3. And about the length ratios of zones are they correct John ??

Thanks a lot for sharing knowledge John 👍🏻😊

[racket]

Yep , you could shorten the length as propane burns so quickly , maybe go to 250 mm .

Leave Secondary and Tertiary hole diameters as you have them .

The Primary holes should be in a position where the radial propane spray would theoretically impact the top row of holes , you only need two rows of holes, so hopefully you can move them a little further towards the "top" of the flame , leave Secondaries "in the middle" and perhaps move the Tertiary holes a tad further downstream especially as you'll need a transition "funnel" between flametube and the turb scroll inlet which adds to the overall Tertiary Zone length

[vineeth]

John the inlet pipe from the compressor to combustor must be tangential to the casing ?or straight 90 degree inlet as one of Andy’s video on flame tube design says it can be 90 degree to combustor..
I wanted ur inputs on this John ..
And how much should be the length of transition cone from dilution zone to exit of combustor.

[racket]

Hi Vineeth

I like 90 degrees with a diffusing funnel to spread the flow over a larger area as it enters the combustor .

On a 5" flametube a 3 or 4 inch axial length for the funnel should do , but it'll depend on the scroll inlet size , the main thing is to have a smooth transition

Cheers
John

[vineeth]

That’s a great piece of info John I’ll be updating my build pics soon..


Thanks John 😊

[racket]

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