In an earlier thread of mine…
the technology exists to recapture exhaust energy and return it to the output shaft for use.
Suppose I want to make the alternating current a function of the compounder’s RPM (via a reduction gear due to the turboshaft speeds in excess of hundreds of thousands of revs.)
IIRC, household AC reverses polarity 70 times a second.
An engine would be cycling up and down the RPM range, thus creatong AC frequencies above and below 70 hertz.
How much more or less efficient would a home-engineered AC st-up be?