Why Aeroacoustics?

Aeroacoustics is centrally concerned with the generation and propagation of sound through a fluid. The prefix aero implies air, but one can also include sound in other fluids, such as water (also called hydroacoustics). Aeroacoustics is part of the broader topic of acoustics, the latter of which can include sound propagation through other types of media, including solids, plasmas, etc. Our research is primarily concerned with the generation, propagation, and minimization of sound produced by engineering and biological systems.  Through a combination of theory and computation we analyze complex systems from a physics-based perspective, usually solving the two- or three-dimensional compressible Navier-Stokes equations directly.

Aeroacoustics is a critical component in aerospace vehicle design, certification, and operation.  In commercial aircraft, sound from the engines affects how the airplane is used in and around the airport and whether the airplane is quiet enough to satisfy certification requirements.  In military aircraft, especially carrier-borne aircraft, the close proximity of the aircraft to personnel creates communication challenges and poses a severe hearing-loss health hazard.

What is going on in aeroacoustics research at Illinois?

Our faculty focus on computational aeroacoustics, using theory to guide and interpret the simulations.  We have long-standing studies to predict and control the noise radiated by turbulent jets for NASA, AFOSR, and ONR using optimal control and advanced, data-driven model-based controllers.  Large-scale simulations are currently being used to predict the noise from the propulsive fan in modern high-bypass ratio engines and were used to study how sound is absorbed in acoustic liners.  Our faculty are also interested in biological aeroacoustics and currently study the sound generation of a small Panamanian bird, the mechanics of human speech, and the use of sound to break up kidney stones (lithotripsy). Additionally experimental investigations of jet noise and nozzle exit geometries have been conducted in the anechoic chamber located in the Gas Dynamics Laboratory at the Aerodynamics Research Laboratory funded by ONR, Rolls Royce and Gulfstream.

Who are the faculty members in the area?

Willett Professor, Department Head

What are the classes in this area?

AE 410: Introduction to Computational Aerodynamics

AE 412/ME 411: Viscous Flow and Heat Transfer

AE 416: Applied Aerodynamics

AE 433: Aerospace Propulsion

AE 434: Rocket Propulsion

AE 435: Electric Propulsion

AE 451: Aeroelasticity

AE 510/ME 510: Advanced Gas Dynamics

AE 511: Transonic Aerodynamics

AE 514: Boundary Layer Theory

AE 515: Wing Theory

AE 538: Combustion Fundamentals

AE 564 Advanced Aero Propulsion Lab

AE 598 CAA: Aeroacoustics

AE 598 MCF: Multiphase CFD

AE 598 UA: Unsteady Aerodynamics

TAM 531: Inviscid Flow

TAM 532: Viscous Flow

TAM 536: Instability and Transition

TAM 538: Turbulence