The interactions between vortexes influence on thesound field in the flow field of 90° curved tube
LI Li , SHEN Zhuangzhi1*, SHEN Jianzhong , ZHENG Xia1
(1 College of Physics and Information Technology, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasonics, Xi′an 710119, Shaanxi, China;2 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
Abstract:
The unsteady turbulent flow field for 90° bend tube was numerically simulated by using the large eddy model of the fluent software. On the basis of the flow field calculation, the sound field was monitored by FWH equation, getting five diagrams which showed the relationship that the sound pressure of different cross section changed with time. The simulation results showed that the flow field can produce secondary vortex in a certain external conditions. The merge or split between the vortex and the vortex produced a certain sound pressure.The changing situation of flow field and sound field on the five different cross sections were also showed,The interaction between vortexes in different moments influence on the sound field was confirmed. According to the five specific areas of the flow field, five monitoring points were selected on the each cross section, and then they were simulated on by FWH calculation. The results showed that, the sound pressure in the sound field increased with time firstly, and quickly leveled off after reaching the maximum value.
KeyWords:
90° curved tube; flow field; sound field; vortex; numerical simulation
