kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:07:29 GMT -5
Hi Guys, Im temporarily switching from my previous project to a pure turbocharger based build, as I realized Im lacking the Design Knowledge & Tools to do a good job which could result in a working jet. I figure I have a better chance of turning Money into lots of noise by attempting a pure turbocharger based build . So, here is my starting point. a pretty decent condition Holset H2D turbo. Nil radial or axial Play that I could feel of the rotor. it is a twin scroll unit though. Kevin
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:09:51 GMT -5
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:14:45 GMT -5
I haven't really torn into the unit yet , but the info available on the net is:
compressor dia: 61.5/92.5mm (trim:44.2), 8 fins with 27.5mm height turbine dia: 76/85mm (trim:79.9), 11 fins with 35.5mm height, 25cm2 housing
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:17:51 GMT -5
Started work on solidworks Modeling the flange & flametube adaptor.
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:26:55 GMT -5
Initial design. It's based off the jetspecs, diameters are a compromise though based on availability. JS - 130mm ID Racket -> 3x inducer ~ 107mm Mine - 96mm ID Length isn't an issue. I'm hoping to run on kero, but I'll be happy with just propane. Model of the funnel section ( what do u guys call it actually? ) Finally, the flat pattern of the funnel.
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 11, 2016 22:29:14 GMT -5
hopefully ill have the flat pattern cut & shaped during the weekend.
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mitch
Senior Member
Joined: August 2014
Posts: 285
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Post by mitch on May 11, 2016 23:23:27 GMT -5
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 12, 2016 1:19:27 GMT -5
Hi Mitch, yeah the divided turbine inlet & its associated problems is the reason I designed the converging funnel the way I did. a few heavy welds at the pinch point of the funnel once blended should do the trick I feel.
A noob question to the experts here..
what is A/R? & what is its significance in a turbocharger build?
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Post by racket on May 12, 2016 1:59:47 GMT -5
A is the Area of the nozzle in the scroll, R is the Radius the nozzle throat is at , the bigger the A/R the more flow potential the scroll has
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on May 13, 2016 1:25:30 GMT -5
Hi John, I readup on the A/R a bit more. would it be correct to assume that turbine scroll A/R is only a factor if/when designing the free power section? does it have an impact on the Gas producer?
Kevin
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Post by racket on May 13, 2016 4:27:53 GMT -5
Everything in a gas turbine has an impact on everything else , all of the flow passageways needs to be matched to everything else for the engine to perform to its potential .
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 13, 2017 6:44:03 GMT -5
hi guys, can somebody please let me know how to size the central evap tube? dia/length & number/placement of holes?
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kevin
Junior Member
Joined: April 2016
Posts: 50
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Post by kevin on Apr 14, 2017 6:53:48 GMT -5
found this quote of Johns regarding the Evap tube dia, ->
"As a rough guide, the total "internal" flow area of the evaporators need to be ~10% of the inducer area , and the total surface area of the evaporators, about 6 times inducer area , you need sufficient number of evaporators to provide adequate coverage of the flametube crossection "
so that gives me a baseline of ~ 10mm radius tube of length 95mm for the Evap tube
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Post by racket on Apr 14, 2017 23:18:41 GMT -5
Hi
Inducer 61.5 mm dia = 2970 sq mms . so 297 sq mm for tube/s cross sectional area
2970 X 6 times = 17820 sq mms for heating surface area of tube/s
I don't understand your "95 mm length" , could you please explain
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 2:58:19 GMT -5
sorry, i rechecked & that was an error. Length of the Evap tube should be ~ 284mm.
Is it advice-able to go with one central Evap tube? (im considering ease of fabrication mainly here)
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