Numerical simulation and experimental validation of characteristics of jet noise from submerged axisymmetric nozzle
<b>[Objectives]</b> In order to study the underwater jet noise characteristics,<b>[Methods]</b> the Lighthill acoustic analogy is carried out to compute the underwater free jet flow sound field characteristic of axisymmetric nozzle, with applying of FLUENT simulation software...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Office of Chinese Journal of Ship Research
2017-12-01
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| Series: | Zhongguo Jianchuan Yanjiu |
| Subjects: | |
| Online Access: | http://www.ship-research.com/EN/Y2017/V12/I6/49 |
| Summary: | <b>[Objectives]</b> In order to study the underwater jet noise characteristics,<b>[Methods]</b> the Lighthill acoustic analogy is carried out to compute the underwater free jet flow sound field characteristic of axisymmetric nozzle, with applying of FLUENT simulation software and large eddy simulation, the real flow field of submerged axisymmetric nozzle is simulated, and the jet noise is measured by the reverberation method.<b>[Results]</b> The results show that the core length of steady flow field is independent of flow rate, and the length is about 8 times the diameter of the nozzle. The radiation power of jet noise is proportional to the velocity of eight times. The power spectrum of jet noise is different with the flow velocity in the low frequency. In the high frequency, the difference is significantly reduced. The radiated noise energy is mainly concentrated in the low frequency. With the increase of flow velocity, the main contribution of jet noise moves to high frequency.<b>[Conclusions]</b> In terms of computing simulation of jet noise, the large eddy simulation and Lighthill acoustic analogy combined analysis is an effective means. |
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| ISSN: | 1673-3185 1673-3185 |