公开(公告)号：US11815048B2

公开(公告)日：2023-11-14

申请号：US17398817

申请日：2021-08-10

Applicant: ROLLS-ROYCE plc

Inventor： Vasileios Kyritsis ,  Maurice Bristow ,  Peter Loftus

IPC: F02K3/075 ,  G01F1/66

CPC classification number: F02K3/075 ,  G01F1/66 ,  F05D2220/36 ,  F05D2260/40311 ,  F05D2260/606 ,  F05D2270/112 ,  F05D2270/303 ,  F05D2270/306 ,  F05D2270/80

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.