spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
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Post by spartablades on Mar 10, 2020 9:09:30 GMT -5
HELLO everybady i m starting that project ..first of all i have a big turbo from scania with inducer diameter 7,4 cm a lot of questions that I had is solved see here : firts of all that project will burn basically a kerosine ( but it will start with propane) my flame tube i calculate is : 14,8 diameter and 44,5 cm lenght the combustion cumber will be : 20cm diameter and 44,5 lenght now firts question i have is: 1 ) how must be the air gap between flame tube & combustion cumber? 2) how much must be the thickness ( flame tube thickness & combustion cumber thickness) that is my question for now...thank you all of you... ( i can say all of my project all of you can saw that to my youtube channel: Spartan Blades FPV) www.youtube.com/channel/UCDxCdaTpb_FUvczoCGi5QMg?view_as=subscriber
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Post by racket on Mar 10, 2020 16:17:58 GMT -5
Hi
NO air gap , ALL air MUST pass through the flametube holes , you need a rattly slip joint at the turbine end of the flametube to accomodate axial expansion of the flametube , and a smooth transition piece between flametube cross section and the scroll inlet .
Flametube sheeting , stainless steel of 1mm thickness to cope with the heat , outer can needs to be a "pressure vessel" so whatever is required , it using commercially available 200 mm tubing then at least 1mm thickness will probably be OK , if rolling and welding something yourself then maybe go a tad thicker at 1.5mm
Cheers John
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Mar 10, 2020 16:36:24 GMT -5
Hi NO air gap , ALL air MUST pass through the flametube holes , you need a rattly slip joint at the turbine end of the flametube to accomodate axial expansion of the flametube , and a smooth transition piece between flametube cross section and the scroll inlet . Flametube sheeting , stainless steel of 1mm thickness to cope with the heat , outer can needs to be a "pressure vessel" so whatever is required , it using commercially available 200 mm tubing then at least 1mm thickness will probably be OK , if rolling and welding something yourself then maybe go a tad thicker at 1.5mm Cheers John NO air gap???could the air gap be my mistake ... bypass section?
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Post by racket on Mar 10, 2020 16:56:08 GMT -5
No bypass section .............thats an old design , not used anymore as the "gap" area will vary depending of the different expansion rates etc etc , if all air goes through the wall holes the division of airflow remains constant
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Mar 11, 2020 3:57:44 GMT -5
No bypass section .............thats an old design , not used anymore as the "gap" area will vary depending of the different expansion rates etc etc , if all air goes through the wall holes the division of airflow remains constant what should I do with this blank, should I seal it?
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Post by racket on Mar 11, 2020 19:57:09 GMT -5
Yes , you need a slipjoint so that axial expansion of the flametube can be accomodated, all air must go through the flametube wall holes , some minor "leakage" at the slipjoint is OK
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Mar 26, 2020 22:15:27 GMT -5
Yes , you need a slipjoint so that axial expansion of the flametube can be accomodated, all air must go through the flametube wall holes , some minor "leakage" at the slipjoint is OK can i found somewhere diagrams about the throttle ? i mean how increase and decrease the rpm? or somebody explain to me? firts to tha start run i will use propane... the increase /decriese of throttle example is for the bottle with liquid (photo 1) after ..when kero start how i use throttle ? my plans in my mind is... the fuel injection i think use a beck from car fuel injection (photo 2) ...pump from car too ( photo 3)... now the throttle increase /decrese? electric with pontetiometer photo 4 or mechanic photo 5 ?
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Mar 26, 2020 23:03:46 GMT -5
and something else ...what is the circuit of oil way? is there a diagram for oil movement ?
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Post by racket on Mar 27, 2020 1:42:06 GMT -5
Same as on an IC engine, ........... oil tank , suction line to pump , pump , pressure relief , oil filter , pressure line to turbo (through optional oil cooler), oil pressure reader at turbo oil inlet , oil through turbo , gravity drain back to tank or use a scavenge pump As for fuel throttling , have your read the relevant Section here jetandturbineowners.proboards.com/thread/680/diy-turbines
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Apr 10, 2020 9:32:27 GMT -5
Same as on an IC engine, ........... oil tank , suction line to pump , pump , pressure relief , oil filter , pressure line to turbo (through optional oil cooler), oil pressure reader at turbo oil inlet , oil through turbo , gravity drain back to tank or use a scavenge pump As for fuel throttling , have your read the relevant Section here jetandturbineowners.proboards.com/thread/680/diy-turbineshello... 2-3 questions again... 1) for that project i must necessary to use stainless steel hoses for the combustion chamber? 2) dimensions : flame tube 45cm lenght 14,8 cm diameter and how much you thiny to use a thickness? comb cumber : 45cm lenght 20cm diameter ...and how much thickness? 3) thickness about thickness for that's pieces: 4) the hole frome intake to combustion must be to the center or the side of the tube; what is better? 1 or 2 and why THHAANNNNN YOU Personally racket
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Post by racket on Apr 10, 2020 17:01:49 GMT -5
Hi
Flametube is preferably made from stainless steel sheet of 1 mm thickness, it must be a bit thicker, maybe 3mm , if made from mild steel tubing so as to cope with the heat/flames
The outer combustor can will need to hold the air pressure , so use 20cm steel tubing of at least 1.5mm thickness.
The air delivery tube needs to be attached as per #2, straight in at center.
You have a number of mounting points in your combustor cap , do you intend uding multiple fuel injectors ?
Cheers John
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Apr 10, 2020 17:46:11 GMT -5
so the outer tube: stainless steel with a thickness of 2mm
and inner (flame tube) 1.5 mm stainless steel tube
now for how many injectors I will need to install I do not know..because in my mind I am planning to put 1 or 2 injector injectors from a car
how thickness you think ?
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Apr 10, 2020 17:47:23 GMT -5
so the outer tube: stainless steel with a thickness of 2mm and inner (flame tube) 1.5 mm stainless steel tube now for how many injectors I will need to install I do not know..because in my mind I am planning to put 1 or 2 injector injectors from a car how thickness you think ?
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Post by racket on Apr 10, 2020 20:11:26 GMT -5
Automotive injectors probably won't survive the heat, the endcap they will be mounted in can run red hot
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
|
Post by spartablades on Apr 10, 2020 21:14:50 GMT -5
Automotive injectors probably won't survive the heat, the endcap they will be mounted in can run red hot Something else as idea for nozzle?
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