nnhalo
New Member
Joined: February 2017
Posts: 2
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Post by nnhalo on Feb 25, 2017 19:05:14 GMT -5
Im rebuilding my flame tube as my last one was definitly not the best for my turbo. In jet specs my inducer sizes calls for a 6in flame tube which means a 7 in housing. well its rather tricky finding the 7in pipe for a decent price and not needing a whole lot. however i have 5 in pipe and 6 in pipe i was curious to know if i could get away with a smaller diameter flame tube if i make it longer? and if so aprx how much longer? the inducer is 56 mm wide using a holset hx35w turbo.
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Post by racket on Feb 25, 2017 21:19:46 GMT -5
A 5" dia flametube inside a 6" outer can will be OK for a 56mm inducered compressor wheel , we need a minimum of 3 times the inducer area for our flametube cross sectional area .
If you use a 5" FT you only need to make it 12 -15 inches long ................once you go past that ~3:1 ratio of FT length to FT dia theres nothing to be gained by any more length , if anything there will be extra losses .
The critical part of the flametube is cross sectional area , we CANNOT compensate by increasing length .
Cheers John
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nnhalo
New Member
Joined: February 2017
Posts: 2
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Post by nnhalo on Feb 25, 2017 22:10:39 GMT -5
Thanks john will let yall know how it turns out
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Apr 15, 2017 9:34:25 GMT -5
The 3:1 area ratio suggests to me the criteria for flame can flow area is a matter of velocity but is this minimum area ratio fixed in all cases or can it change with combustion chamber geometry? Can Annular Rectangular
I'm wondering is there a total flow area to total surface area ratio effect?
Lets use a hypothetical comparison for example. A baseline single 7.1" diameter flame can of 40 square inches flow area. Vs A rectangular combustion chamber (of high aspect ratio) also with 40 square inches. Say a 2" X 20" combustion chamber.
Assuming we stay above the minimum critical area for the flame holder to sustain the flame, how will this change of geometry affect flame length, combustion efficiency and zone 3 coolant air jet penetration?
Are chamber length and area requirements affected by chamber geometry or aspect ratio? How about the use of downstream swirlers or turbulators?
Thanks, Tony
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Post by racket on Apr 15, 2017 17:24:33 GMT -5
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Apr 15, 2017 22:10:22 GMT -5
Very cool. I just got a copy of that book in a couple days ago. I'll check it out. Thank you!
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Post by racket on Apr 15, 2017 23:35:05 GMT -5
Its the "bible" regarding combustion thats applicable to our needs , more modern editions get too complicated.
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