Aeroacoustics of Low Mach Number Flows: Fundamentals, Analysis, and Measurement

Aeroacoustics of Low Mach Number Flows: Fundamentals, Analysis, and Measurement provides a comprehensive treatment of sound radiation from subsonic flow over moving surfaces, which is the most widespread cause of flow noise in engineering systems. This includes fan noise, rotor noise, wind turbine noise, boundary layer noise, and aircraft noise.

Beginning with fluid dynamics, the fundamental equations of aeroacoustics are derived and the key methods of solution are explained, focusing both on the necessary mathematics and physics. Fundamentals of turbulence and turbulent flows, experimental methods and numerous applications are also covered.

The book is an ideal source of information on aeroacoustics for researchers and graduate students in engineering, physics, or applied math, as well as for engineers working in this field.

Supplementary material for this book is provided by the authors on the website www.aeroacoustics.net. The website provides educational content designed to help students and researchers in understanding some of the principles and applications of aeroacoustics, and includes example problems, data, sample codes, course plans and errata. The website is continuously being reviewed and added to.

Explains the key theoretical tools of aeroacoustics, from Lighthill’s analogy to the Ffowcs Williams and Hawkings equationProvides detailed coverage of sound from lifting surfaces, boundary layers, rotating blades, ducted fans and more Presents the fundamentals of sound measurement and aeroacoustic wind tunnel testing

Part 1: Fundamentals 1. Introduction 2. The equations of fluid motion 3. Linear acoustics 4. Lighthill's acoustic analogy 5. The Ffowcs Williams and Hawkings equation 6. The linearized Euler equations 7. Vortex sound 8. Turbulence and stochastic processes 9. Turbulent flows

Part 2: Experimental approaches 10. Aeroacoustic testing and instrumentation 11. Measurement, signal processing, and uncertainty 12. Phased arrays

Part 3: Edge and boundary layer noise 13. The theory of edge scattering 14. Leading edge noise 15. Trailing edge and roughness noise

Part 4: Rotating blades and duct acoustics 16. Open rotor noise 17. Duct acoustics 18. Fan noise