VANELESS COUNTERROTATING TURBINE

摘要

A gas turbine engine includes a compressor section, a combustor, and a turbine section. The turbine section includes a first turbine portion and a second turbine portion, with the first and second turbine portions being counter-rotating turbine portions. A transition duct transitions fluid flow from the first turbine portion to the second turbine portion. The transition duct is a vaneless transition duct.

主权项

1. A gas turbine engine comprising:
a compressor section; a combustor fluidly connected to the compressor section via a primary flowpath; a turbine section fluidly connected to the combustor via the primary flowpath, wherein the turbine section includes at least a first turbine portion and a second turbine portion connected to the first turbine portion via a transition duct, fluid in the second turbine portion having a lower pressure than fluid in the first turbine portion, and wherein the first turbine portion and the second turbine portion are counter-rotating turbine portions; wherein the second turbine portion includes at least three turbine stages; wherein the transition duct is vaneless; and wherein the first turbine portion and the second turbine portion are counter rotating turbine portions.