A General Introduction to Aeroacoustics and Atmospheric Sound
Abstract
This paper uses a single unifying principle (based upon the nonlinear momentum-flux effects produced when different components of a motion transport different components of its momentum) to give a broad scientific background to several aspects of the interaction between airflows and atmospheric sound. First, it treats the generation of sound by airflows of many different types. These include, for example, jet-like flows involving convected turbulent motions -- with the resulting aeroacoustic radiation sensitively dependent on the Mach number of convection -and they include, as an extreme case, the supersonic boom (shock waves generated by a supersonically convected flow pattern). Next, the paper analyses sound propagation through nonuniformly moving airflows, and quantifies the exchange of energy between flow and sound; while, finally, it turns to problems of how sound waves on their own may generate the airflows known as acoustic streaming. aeroacoustics; turbulence; sonic boom.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1992
- Accession Number
- ADA257887
Entities
People
- James Lighthill