Prediction the Jet Near-Field Noise of Combat Aircraft
Abstract
QinetiQ (previously DERA) is currently undertaking on behalf of the UK MOD an integrated programme of applied research to develop improved prediction methods for acoustic fatigue assessment on next generation combat aircraft. This paper describes ongoing work to develop practical methods of predicting the near-field noise of the high-speed exhausts of military jet engines, for use at an engineering level. The study encompasses both jet mixing noise and broadband shock noise for single and twin jets and is focused on predicting the intensity, spectra and spatial coherence of jet noise at the airframe, using a semi-empirical basis that marries aeroacoustic theory with source location data. The background to the development of the method through small scale heated model noise tests in the QinetiQ Noise Test Facility is described, followed by validation through near-field noise tests conducted in the QinetiQ GLEN sea-level engine test facility on a Rolls-Royce Spey turbojet engine.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2003
- Accession Number
- ADP014103
Entities
People
- M. Harper-bourne