Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Numerical simulations of the flow and sound fields of a heated axisymmetric pulsating jet
AU - Jiang, Xi
AU - Zhao, H
AU - Cao, L
PY - 2006/2
Y1 - 2006/2
N2 - 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.
AB - 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.
KW - flow pulsation
KW - jet noise
KW - direct numerical simulations
KW - BOUNDARY-CONDITIONS
KW - DIRECT COMPUTATION
KW - GENERATION
KW - SCHEMES
KW - NOISE
U2 - 10.1016/j.camwa.2005.03.022
DO - 10.1016/j.camwa.2005.03.022
M3 - Journal article
VL - 51
SP - 643
EP - 660
JO - Computers and Mathematics with Applications
JF - Computers and Mathematics with Applications
SN - 0898-1221
IS - 3-4
ER -