Quote:
Originally Posted by Slide
By shit I mean all this wonderful information lolz
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lol did you start reading from my post 2 pages back or so?
Quote:
Originally Posted by Dimman
That velocity/axial part was paraphrasing what it said in the article. 
My understanding is high velocity going in a straight line becomes pressure once it runs into something like a turbine blade.
Maybe what I didn't make clear was that there is also a turbo in front of this second generator turbine. So pulsing is not an issue. |
Ah I see. So the wikipedia article on turbine is pretty helpful imo, in illustrating reaction vs. impulse turbine. If you have gas going at high velocity in a straight line and it hits the turbine, it gets deflected and it transfers momentum to the turbine. An axial turbine makes it easier to add stages to more effectively recover additional energy since you just stick a new row of blades behind it, whereas with a radial turbine you'd need a pipe that bends around and channels the flow into the second turbine, which would cause the gas to lose some energy most likely, which is perhaps why they'd be thinking of doing that.
If this shows up in F1 I will be SUPER excited. However in the ultimate quest for fuel efficiency, I am not sure how useful this is vs. late intake valve closure + larger displacement, which is much cheaper to do and theoretically more efficient, although the larger displacement has additional losses associated with it. One thing that will change for sure though is that spectators won't be blasted by the scream of engines that just release all the pressure straight into the air, which might be a disappointment to some people lol.
I wonder how much power they can recover though, racing engines have pretty high compression ratio...on old aircraft they were making ridiculous amounts like 500hp on a 1400hp engine since they had pathetic compression ratios like 6:1. Or wait I think the wikipedia example was a diesel...anyways pretty low compression ratios. This can theoretically bring the efficiency of the engine well past 40%, but that needs to counteract the drop in displacement...you can only boost so much.