Quote:
Originally Posted by Old Mechanic
Look at my two linked earlier threads on this forum. I think you will see I proposed exactly what they are doing several years ago. They are just catching up with my thinking, and I have had 2 years and 5 years to refine those thoughts.
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My thread.
http://ecomodder.com/forum/showthrea...ion-21646.html
The problem is that the design of the Roots is fundamentally an extremely lossy process as the manifold air undergoes free expansion. Modern superchargers (namely Eaton TVS) have been able to get the efficiency very high in a certain range by "tuning" the outlets, utilizing acoustic effects to improve the cycle. However the tuned outlets don't work in reverse, so you'd be looking at maybe only 20% efficiency in recovering the energy. Still, better than 0, I would love to try this with a CVT or electric supercharger one day.
It should at the very least work better than a centrifugal blower driven as a turbine, because the inducer/exducer area ratio on that is not 1, even if you block off the inlet to increase velocity.