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Reverse core gear turbofan

  • US 9,239,004 B2
  • Filed: 03/27/2012
  • Issued: 01/19/2016
  • Est. Priority Date: 03/27/2012
  • Status: Active Grant
First Claim
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1. A gas turbine engine comprising:

  • a fan at an axially forward location, said fan rotating about an axis of rotation;

    said fan delivering air into an outer bypass duct, and across a booster fan positioned radially inwardly of said outer bypass duct, said booster fan delivering air into a radially middle duct, and said booster fan delivering air across a cold turbine section into a radially inner core duct wherein said middle duct is located radially inside of said outer bypass duct and radially outside of said inner core duct;

    air from said cold turbine section in said inner core duct being directed into a compressor section, and then flowing axially in a direction back toward said fan via a duct located radially inside of said inner core duct through a combustor section, and across a core turbine section, and then being directed into said middle duct; and

    a gear reduction for driving said fan from a fan drive turbine section.

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