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Post by azwood on Nov 15, 2018 0:00:13 GMT -5
Hi all Ive had an idear bouncing round in my head for a while about making a hybrid engine.the idear is to use a large compressor and housing paired with a big brushless electric motor then a combustor.I know turbines take power to run but burning fuel to make more power might be interesting with no exhaust wheel to fry get,s shouldn't matter that much.does such a thing already exist  |
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Post by racket on Nov 15, 2018 0:37:36 GMT -5
Yep , its called a EDF with afterburner
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Post by azwood on Nov 15, 2018 0:50:08 GMT -5
Yep , its called a EDF with afterburner That's close but why not have a flame tube and a afterburner. |
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Post by racket on Nov 15, 2018 2:46:14 GMT -5
No need for a flametube as theres no need for dilution of the gases to reduce their temperatures , just straight out of the fan( compressor wheel) , into the A/B and "burn" 100% of the air .
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BFTO
Veteran Member
Joined: February 2016
Posts: 128 
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Post by BFTO on Nov 15, 2018 4:35:52 GMT -5
Have you seen this jet with a EDF? EDF -> Afterburner
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Post by racket on Nov 15, 2018 18:25:39 GMT -5
Thats a nice build , though they could have increased the diameter downstream of the fan to prevent thermal choking which was probably causing their "pulsing" as the axial comp wheel/s surged, they might have also obtained a bit more thrust increase .
Very informative , a good video
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elventu
Veteran Member
Joined: October 2018
Posts: 122
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Post by elventu on Nov 19, 2018 19:05:09 GMT -5
Maybe I'm wrong, but I see an useless thing.
It seems to me like a bad burning low efficiency thing.
And I hope for them there are some wind, because breathing vaporized methanol isn't a good idea.
Why use electricity to run a fan (with all the complexity and weight coming from the electricity supply) when there are gas turbine for the purpose?
It is a sort of hybrid between a heater burner and a jet...what is its purpose?
Just asking, I can't understand.
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Post by azwood on Nov 21, 2018 20:30:03 GMT -5
Maybe I'm wrong, but I see an useless thing. It seems to me like a bad burning low efficiency thing. And I hope for them there are some wind, because breathing vaporized methanol isn't a good idea. Why use electricity to run a fan (with all the complexity and weight coming from the electricity supply) when there are gas turbine for the purpose? It is a sort of hybrid between a heater burner and a jet...what is its purpose? Just asking, I can't understand. I see what your saying but with a malty stage compressor and the recent advances in both battery's and brushless motors sorely someone could make ane that makes some decent power.as for the weight comventanl jets can be heavy to its interesting stuff. |
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Post by Johansson on Nov 22, 2018 0:28:31 GMT -5
Maybe I'm wrong, but I see an useless thing. It seems to me like a bad burning low efficiency thing. And I hope for them there are some wind, because breathing vaporized methanol isn't a good idea. Why use electricity to run a fan (with all the complexity and weight coming from the electricity supply) when there are gas turbine for the purpose? It is a sort of hybrid between a heater burner and a jet...what is its purpose? Just asking, I can't understand. I agree fully, a ducted fan can be quite powerful nowadays but adding the weight and complexity of afterburning must be just because it looks cool. For a given total weight a slightly bigger fan with more batteries would give more thrust. |
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Post by azwood on Nov 22, 2018 0:39:55 GMT -5
I guess my point is for a turbojet you need oil pumps coolers oil tank etc all those systems need battery's anyway so the argument is if done from a turbo compressor with a motor none of the thrust is being used to run turbines so the power made is 100% gain
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Post by azwood on Nov 22, 2018 0:43:18 GMT -5
Anyway I'll put something together one day and see what happens.
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Post by Johansson on Nov 22, 2018 3:24:32 GMT -5
I think a turbocharger compressor is a bad choice, it takes too much power to make PR so a high flow/low pressure fan would demand much less power from the motor.
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