12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Numerical simulations of the flow and sound fie...
View graph of relations

« Back

Numerical simulations of the flow and sound fields of a heated axisymmetric pulsating jet

Research output: Contribution to journalJournal article

Published

Associated organisation

Journal publication date02/2006
JournalComputers and Mathematics with Applications
Journal number3-4
Volume51
Number of pages18
Pages643-660
Original languageEnglish

Abstract

The flow and sound fields of a heated axisymmetric pulsating jet have been investigated by direct numerical solution of the compressible Navier-Stokes equations in cylindrical coordinates using highly accurate numerical methods. Effects of pulsating frequency and amplitude on the flow structure and sound generation have been examined. The results show that the organized unsteadiness associated with the periodic pulsation leads to a variety of vortical structures in the pulsating flow field. The pulsating frequency and amplitude strongly affect the vortical flow structures and the radiated sound fields. At the higher pulsating frequency, the vortices in the pulsating jet become smaller and the radiated sound field has smaller wavelength. The pressure fluctuation amplitude of the sound field is inversely proportional to the distance from the sound source. Both the larger pulsating frequency and larger pulsating amplitude lead to stronger sound emissions from the pulsating jet, It has been found that the pressure fluctuation amplitude of the sound field is approximately proportional to the pulsating amplitude and frequency. (c) 2006 Elsevier Ltd. All rights reserved.