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Post by turboseantsi on Jul 16, 2020 12:44:45 GMT -5
Hello I have a gtc85 air starter turbine or a huffer cart as some call it. But I'm looking for a way to collect the power from this turbine to power a shaft I was thinking of using a air starter like a parker air turbine starter. I need the out put to be around 6000rpm not sure if this is possible trying to turn a prop for a small boat any input would be great
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Post by racket on Jul 16, 2020 17:14:18 GMT -5
Yep , you should be able to use the GTC85 to get some shaft horsepower as long as the "motor" is a match for the airflow rate/pressure being delivered by the GTC85.
You could also use a supercharger running "backwards" as the power "motor" , an air turbine starter might not have the durability for continuous duty .
Cheers
John
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Post by turboseantsi on Jul 17, 2020 6:58:23 GMT -5
That's not a bad idea with the supercharger and I was wondering about the durability of the long running on a air starter or am I better off going on the hot end and make a 2 shaft power shaft
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Post by racket on Jul 17, 2020 17:29:09 GMT -5
A "hot" freepower would produce more horsepower as hot gases have more energy than "warm" air , you could always run the compressed air you already have through a combustor to increase its temperature then feed it into a freepower stage .
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Post by turboseantsi on Jul 19, 2020 14:15:42 GMT -5
Not sure if a supercharger will withstand the heat tho. May have to do a turbocharger with custom shaft and bearings
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Post by racket on Jul 19, 2020 18:23:08 GMT -5
Yeh , supercharger only suitable for "cold" air , you'll need a turbine wheel for hot gases
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Post by turboseantsi on Jul 19, 2020 18:24:23 GMT -5
Should be interesting to figure out a correct turbo wheel size
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Post by racket on Jul 19, 2020 19:57:30 GMT -5
You'll have a much higher pressure going in so the gas velocities will be very high so the wheel will be considerably smaller than we'd normally use , more of a largish turbo size .
You'll need to get some flow data for the compressed air and then it'd be a simple matter of doing some calcs
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Post by turboseantsi on Jul 24, 2020 13:32:38 GMT -5
How do I collect the flow of the exhaust pressure to figure this out
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Post by racket on Jul 24, 2020 18:32:35 GMT -5
You should be able to get the data by doing a bit of a search on the Net for your engine specs
Another way would be to measure the "blower" intake area and then do some guesstimations.
Cheers
John
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Post by turboseantsi on Jul 24, 2020 19:13:25 GMT -5
Not much info I found on my engine I have a manual but it's not for my exact one
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Post by racket on Jul 25, 2020 0:27:04 GMT -5
Probably ~1.5-2 lbs/sec at 35-45 psi , so a very large truck turbo hot end would be required as the freepower
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