US 11,988,098 B2
Increasing surge margin and compression efficiency via shaft power transfer
Caroline L Turner, Derby (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Jun. 9, 2023, as Appl. No. 18/208,006.
Application 18/208,006 is a division of application No. 16/892,858, filed on Jun. 4, 2020, granted, now 11,719,117.
Claims priority of application No. 1908368 (GB), filed on Jun. 12, 2019; and application No. 1908369 (GB), filed on Jun. 12, 2019.
Prior Publication US 2023/0332509 A1, Oct. 19, 2023
Int. Cl. F01D 15/10 (2006.01); F02C 3/113 (2006.01)
CPC F01D 15/10 (2013.01) [F02C 3/113 (2013.01)] 6 Claims
OG exemplary drawing
 
1. In a gas turbine engine of the type having a high-pressure (HP) spool and a low-pressure (LP) spool, a method of increasing compression efficiency at a given thrust, comprising:
detecting steady inlet flow or uniform inlet conditions; and
in response to detecting steady inlet flow or uniform inlet conditions, transferring mechanical power from the HP spool to the LP spool to reduce a corrected speed of a HP compressor therein and raise a working line of a LP compressor therein,
wherein the mechanical power is transferred electrically from a first electric machine operating as a generator drivingly connected to the HP spool, to a second electric machine drivingly connected to the LP spool.