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Post by racket on Apr 15, 2017 3:49:54 GMT -5
Hi Kevin
I've just noticed you intend using a 96 mm ID tube for the flametube , this is only ~2.5 inducer areas , this is a tad small for kero , ..............extra length won't help things .
As for how you arrange the evaporator tube/s is up to you , but you must end up with a good coverage of the flametube cross sectional area with the discharge from the system .
Ease of manufacture is hard to achieve with anything other than straight tubes , but fitting a single large tube into the usual flametube for a turbo based engine will be difficult , and as I have no idea of the level of your abilities to construct the system its hard to recommend anything .
Cheers John
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 15, 2017 4:47:01 GMT -5
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 15, 2017 4:52:32 GMT -5
Hi Racket, the 96mm tube was sourced some time ago, i have since gotten a few larger dia to work with. shall posts the specs soon. at the moment im working on the fuel-air delivery method. could you tell me if anything obvious stands out? the red line is the Kero -input discharging into the end of the Evap tube. the blue is the propane discharge. in green is my pressure vessel.
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 15, 2017 5:30:44 GMT -5
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 15, 2017 5:35:04 GMT -5
just noticed an obvious error. redone the drawing again. now its a tube whithin a tube.
Racket, is it an issue for the propane to follow the same path as the kero, heat wise?
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Post by racket on Apr 15, 2017 17:16:07 GMT -5
Hi Kevin
With a single fuel injection point its going to be problematic getting an even distribution of fuel across the flametube crosssection.
Your second version is "better" but it still suffers from the potential of more fuel exiting through one side rather than equally all around , the tube would need to be vertical simply to get some hope of even distribution , but you could end up with "puddling" of fuel in the bottom of the tube at low power setting where the airflow forces to shift the fuel vertically are minimal which could be exacerbated by just how well there is heat transfer to the tube at those low power settings ....................I'm not comfortable with the system :-(
Generally guys go for just propane injection if they have limited access to the means to make more complicated systems , a simple tube poked into the end of the combustor with the end of the tube "sealed" and a couple of rows of very small holes around the tube for the propane to squirt out of will produce a working system without the need for fuel pumps.
What sort of fuel pump were you intending to use for the kero ??
Cheers John
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Aug 28, 2021 7:25:37 GMT -5
HI guys, thought of posting up some updates after reviving this project again as a covid project. this is the new parts design and how they go together and this is what ive got so far... Just need to cut - roll and weld up the outer can in SS... im hoping 1.5mm sheet will suffice?
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