Abstract

Jet noise, at the very heart of aeroacoustics, has been the dominant component of aircraft noise for decades. The reduction of jet noise has been heavily relying on increasing the bypass ratio of aero-engines. The increase of the bypass ratio, and hence the engine diameter, have led to a close coupling between the engine and the aircraft wings.

This close coupling however creates a new problem: jet noise is enhanced significantly at low frequencies by the wing. This modified jet noise is commonly referred to as installed jet noise. In this talk, I will summarize some of the recent work that I have done during my PhD at CUED . This includes a low-order model of the installed jet noise, some experimental studies, and if it time allows, some noise reduction strategies. More importantly, the newly discovered physical mechanism for such a noise intensification will be highlighted.