Pulse turbines

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witek
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Joined: January 2015
Posts: 18

Pulse turbines Feb 10, 2015 21:36:22 GMT -5

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Post by witek on Feb 10, 2015 21:36:22 GMT -5

Hi guys,

Was having a thought the other night and got to thinking about gas turbines again.
As I was thinking about the topic, an idea came to mind to use a pulse jet as a combustor for a gas turbine. Has this been done before? Would it even work?
The turbine itself wouldn't operate on the brayton cycle anymore as there wouldn't be continuous pressure.

Just a curous thought. I'm sure someone has tried it before.

Cheers,
witek

racket
Expert

Joined: August 2010
Posts: 8,933

Pulse turbines Feb 10, 2015 22:12:56 GMT -5

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Post by racket on Feb 10, 2015 22:12:56 GMT -5

Hi Witek

Pulse jet turbine ..... www.youtube.com/watch?v=uqMn0A2aUdo

Power output was very poor, though I can't be 100% certain it wasn't caused by the actual PJ "construction" and/or the alignment of PJ exhaust to turbine wheel , I did get the freepower turbine up to >20,000 rpm with the prop load removed.

I felt that an appreciable amount of the PJ thrust is developed "internally" from pressure differentials rather than as a result of the exhaust velocity like a gas turbine .

PJ operation was unaffected by closing off the "gap" between PJ exhaust and freepower inlet , it happily breathed back thru the turbine wheel .

A much longer tailpipe on the PJ with it operating at a lower frequency might have helped .

Cheers
John