Gas turbine with multiple gas flow paths

摘要

A representative gas turbine (400) includes: a high pressure spool (410); a high pressure compressor (402); a high pressure turbine (406) mechanically coupled to the high pressure spool (410); a lower pressure spool (422) ; a lower pressure turbine (420) mechanically coupled to the lower pressure spool (422); a fan (424) having a first set of fan blades (426) and a second set of fan blades (430), the second set of fan blades (430) being located downstream of the first set of fan blades (426) and being operative to rotate at a rotational speed corresponding to a rotational speed of the lower pressure spool (422); and a gear assembly (428) mechanically coupled to the lower pressure spool (422) and engaging the first set of fan blades (426) such that rotation of the lower pressure spool (422) rotates the first set of fan blades (426) at a lower rotational speed than the rotational speed of the second set of fan blades (430).