FIELD: motors and pumps.
SUBSTANCE: gas turbine engine contains, among other things, a fan section comprising a fan, which is rotatable around an axis, and a gearbox communicating with said fan. Specified gearbox contains an epicyclic gear drive of the fan drive with a gear ratio of a planetary gear of at least 2.5. End speed of the fan blade is less than 1,400 feet per second. Low pressure turbine section communicates with the specified gearbox. Moreover, the specified turbine section of the low pressure has three or four stages and the degree of bypass, lying in the range from 11.0 to 22.0.
EFFECT: increase in operating efficiency is achieved.
15 cl, 3 dwg
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