公开(公告)号：US20250075673A1

公开(公告)日：2025-03-06

申请号：US18596863

申请日：2024-03-06

Applicant: ROLLS-ROYCE plc

Inventor： Alastair D. MOORE ,  Robert J Telling

IPC: F02K3/06 ,  F02C7/24

Abstract: A gas turbine engine generates noise during use, and one particularly important flight condition for noise generation is take-off. A gas turbine engine is provided that has high efficiency together with low noise, in particular from the fan and the turbine that drives the fan. Values are defined for a combined contribution of the turbine noise and the noise from the fan emanating from the front of the engine to the Effective Perceived Noise Level (EPNL) at take-off to be in the range of from 2 EPNdB and 15 EPNdB lower than the EPNL of the whole engine at take-off.

公开(公告)号：US20200263606A1

公开(公告)日：2020-08-20

申请号：US16716698

申请日：2019-12-17

Applicant: ROLLS-ROYCE plc

Inventor： Alastair D. MOORE ,  Robert J. TELLING

IPC: F02C7/24 ,  B64D27/16

Abstract: A gas turbine engine generates noise during use, and one particularly important flight condition for noise generation is take-off. A gas turbine engine has high efficiency together with low noise, in particular from the turbine that drives the fan. The contribution of the turbine noise emanating from the rear of the engine to the Effective Perceived Noise Level (EPNL) is in the range of from 7 EPNdB and 30 EPNdB lower at a take-off lateral reference point than at an approach reference point.