公开(公告)号：US20220074368A1

公开(公告)日：2022-03-10

申请号：US17398817

申请日：2021-08-10

Applicant: ROLLS-ROYCE plc

Inventor： Vasileios KYRITSIS ,  Maurice BRISTOW ,  Peter LOFTUS

IPC: F02K3/075 ,  F02C7/36 ,  F02C9/28 ,  F02C9/18 ,  F02K3/06

Abstract: A turbofan gas turbine engine having a bypass duct, and a bypass airflow measurement system. The bypass airflow measurement system comprises: at least one acoustic transmitter configured to transmit an acoustic waveform across the bypass duct of the gas turbine engine though which a bypass airflow passes to at least one acoustic receiver; where the at least one acoustic transmitter and the at least one acoustic receiver are located on an axial plane that is substantially perpendicular to the bypass flow. A method of measuring bypass airflow properties of a turbofan gas turbine engine is also described.