Low noise turbine for geared turbofan engine

  • US 8,246,292 B1
  • Filed: 02/23/2012
  • Issued: 08/21/2012
  • Est. Priority Date: 01/31/2012
  • Status: Active Grant
First Claim
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1. A gas turbine engine comprising:

  • a fan, a compressor section including a compressor having a low pressure portion and a high pressure portion, a combustor section, and a turbine having a low pressure portion;

    a gear reduction effecting a reduction in the speed of said fan relative to an input speed to said fan;

    said low pressure portion of said turbine having a number of turbine blades in each of a plurality of rows of said turbine portion, and said low pressure turbine blades operating at least some of the time at a rotational speed, and said number of blades and said rotational speed being such that the following formula holds true for at least one of the blade rows of the low pressure turbine
    (number of blades×


    5500; and

    said rotational speed being an approach speed in revolutions per minute.

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