If i understand correctly this is the "back work ratio". I'd like to know how much % of the "gross" thrust is used by the turbine to drive the compressor in a typical turbofan.

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    $\begingroup$ Since you say turbofan, do you mean just the compressor, or both compressor and fan? Because in turbofan, most power is used to drive the fan. $\endgroup$ – Jan Hudec Apr 28 '16 at 6:22
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    $\begingroup$ Just the compressor, since the fan generates useful thrust. $\endgroup$ – Southbob Apr 28 '16 at 11:32