ABSTRACT:
Aircraft engines use acoustic linings to dampen sound as it leaves the engine nacelle. They also involve a large net air flow, typically of around half the speed of sound. A typical mathematical model of this would be a cylinder with uniform net flow and a boundary that can oscillate with a particular impedance, and this model is used to predict the damping of sound at various frequencies within aircraft engines. This model is also sufficiently simple to model other fluid-solid interactions in the presence of a net flow. Unfortunately, it is wrong. In this talk, I will explain why it is wrong, what can be done to correct it, and what the implications of this correction are.
ADDITIONAL INFORMATION:
Ed’s main research interests include fluid-solid interaction and stability, particularly with respect to aeroacoustics.