摘要
利用导管声波模态理论给出了导管的声波截止频率，并采用边界元方法计算了不同流速条件下、不同导管半径及导管半径波长比时的导管内外声场，发现对于相同的导管和声源，流速的增加会使截止频率减小，此外，由于介质速度的影响，导管侧壁和下游管口方向的声场能量会向上游管口方向转移，在低频、高流速条件下，这一规律更加明显。
Abstract
In order to investigate the impact of fluid velocity on the acoustic field of finite-length duct, the cut-off frequency is deduced based on the acoustic modal theory. Then, the interior and exterior acoustic field of finite-length duct is calculated on conditions of varied fluid velocities, duct radiuses and radius-to-wavelength ratios. It is shown that for the identical duct and sound source, the cut-off frequency decreases when fluid velocity increases. Besides, sound energy at the side wall and downstream nozzle of the duct moves upwards due to the presence of fluid velocity, which is more obvious at low frequency or large fluid velocity.
关键词
导管 流速 声场 边界元法
{{custom_keyword}} /
Key words
duct /
fluid velocity /
acoustic field /
boundary element method
{{custom_keyword}} /
吕晓军;杨迎春;周其斗.
介质速度对有限长导管内外声场影响研究[J]. 振动与冲击, 2013, 32(11): 145-148
LV Xiao-jun;YANG Ying-chun;ZHOU Qi-dou.
Effect of fluid velocity on the acoustic field of a finite-length duct[J]. Journal of Vibration and Shock, 2013, 32(11): 145-148
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(1940 KB)
