A Review of the Research at NGTE Concerning the Effects of Flight on Engine Exhaust Noise.

摘要

The problem of explaining the changes of engine exhaust noise in going from static to flight conditions has puzzled research workers for some years. This paper reviews the various experimental research programmes at NGTE which have been carried out on this topic over the last five years. The step-by-step progress which has been made in the analysis of the problem is described and the results from some recent tests, hitherto unpublished, are presented. It is concluded that, together with the characteristics established for jet noise and internally-generated noise in flight, acoustic and aerodynamic effects arising from the installation of engines in aircraft constitute necessary, perhaps sufficient, features of the required explanation. (Author)