LOW NOISE TURBINE FOR GEARED TURBOFAN ENGINE
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United States of America Patent
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Issued Date -
Jul 23, 2015
app pub date -
Apr 9, 2014
filing date -
Jan 31, 2012
priority date (Note) -
Abandoned
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Abstract
A gas turbine engine includes a fan, a turbine having a fan drive rotor, and a speed reduction device effecting a reduction in the speed of the fan relative to an input speed from the fan drive rotor. The fan drive rotor has a number of turbine blades in at least one of a plurality of rows of the fan drive rotor, and the turbine blades operating at least some of the time at a rotational speed, and the number of turbine blades in the at least one row and the rotational speed being such that the following formula holds true for the at least one row of the fan drive turbine (the number of blades×the rotational speed)/(60 seconds/minute)>4000 Hz. The rotational speed being in revolutions per minute. A method is also disclosed.
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