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Old 05-20-2013, 03:01 PM   #21 (permalink)
mechman600
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Quote:
Originally Posted by jamesqf View Post
How do airplanes harness power from turbojet engines? Which are, after all, basically scaled-up turbochargers pushing bypass air out the back end instead of stuffing it in the cylinders of an IC engine.

Simplest answer is that you don't do it mechanically at all. Turbine shaft is mated to the rotor of an alternator, which generates electricity. By switching the alternator so it only generates at higher exhaust flow, you pretty much eliminate any excess turbo lag. If you happen to have a hybrid, you can store the electricity for later use...
Compound turbos do it mechanically through a gear set. The DD16 in my link above does, as did all the WWII airplane engines.

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