Noise generation by a supersonic leading edge. Part 2: examples of two-dimensional sound fields

Formulae for the calculation of the sound fields generated by the interaction between a flat-plate semi-infinite aerofoil and a convected vortical gust in a supersonic mean flow have been developed in part 1. Now the special case of two-dimensional sound fields is considered, and specific examples are given. The examples include a periodic gust, transient gusts, and the problem of a line vortex sweeping past the aerofoil. Study of the resulting fields gives insight into the general behaviour which may be expected. The two-dimensional results are important in the study of complicated three-dimensional fields, as the near-fields often contain a region in which the field is two dimensional.