exhaust driven turbo/generator

[JayMaechtlen]

Ok, the idea has come up a few times

what about a motor/generator tied into a turbocharger?

generator for salvaging energy from the exhaust stream under normal operation

motor for spinning the turbine up quickly for quicker throttle response.

Can a unit be built now for a economical cost that would handle the RPMs and handle the power?


Jay Maechtlen

 

[aorangi]

Electric turbocharger

Hi Jay,
Did you see that thread, from which I quote a former post? The old first link don't work anymore, so I deleted it and found another one on which there's a photo of the thing. I don't have much time to search now, but I'm sure you'll find some more on the web. I read a week or two ago about another company about to market it, but I forgot the name.

Quote :
Garrett makes the Dynacharger, which is a turbocharger assisted with a small electric motor-generator. It allows electric turbocompounding in a way that power can flow from the turbocharger to load the battery or from the battery to the turbocharger for an improved transient response and low-end boost pressure.

A thing we'll probably see soon on production vehicles.
You can see it at :

http://popularmechanics.com/automotive/auto_technology/2001/8/blow_hard/index3.phtml

There's a lot of papers available on line about that. A few below:

http://www.turbodyne.com/10-25-99.html

http://www.osti.gov/hvt/deer2000/baileypa.pdf

http://www.osti.gov/hvt/deer2000/shahedab.pdf

http://www.turbodyne.com/10-25-99.html

Cheers,
Aorangi

 

[GregLocock]

To all intents and purposes motors are the same as alternators, so just read across.

I briefly worked on a turbo driven alternator 15 years ago, so there's no intrinsic problem with the speed.

There's no particular problem with the power, but a 15-40 hp alternator (rough guess) is a fair hunk of metal.

If you were going to do this seriously you'd probably want a more efficient turbine than the usual turbo. This sort of arrangement has (essentially) been used on ships - you end up using the IC engine as the HP stage in a multistage expansion system in effect, which is very efficient.


Cheers

Greg Locock

 

[aorangi]

Yes, Greg, I think a two-stages axial turbine would suit well.

Cheers
Aorangi

 

[JayMaechtlen]

thanks, guys- I had missed that particular post/thread! Jay Maechtlen