轴对称直喷管的水下射流噪声特性数值模拟与实验验证

郉军华; 尚大晶; 张成; 苗天丞

doi:10.3969/j.issn.1673-3185.2017.06.008

轴对称直喷管的水下射流噪声特性数值模拟与实验验证

doi: 10.3969/j.issn.1673-3185.2017.06.008

1.
中国舰船研究设计中心船舶振动噪声重点实验室, 湖北武汉 430064
2.
哈尔滨工程大学水声技术重点实验室, 黑龙江哈尔滨 150001

详细信息

作者简介:
尚大晶, 男, 1968年生, 副教授。研究方向:混响法水声测试。E-mail:shangdajing@hrbeu.edu.cn

通信作者:
邢军华(通信作者), 男, 1982年生, 硕士, 高级工程师

中图分类号: U661.1;TB561
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- 被引次数: 0
出版历程
- 收稿日期: 2017-04-02
- 网络出版日期: 2017-11-28
- 刊出日期: 2017-12-08

Numerical simulation and experimental validation of characteristics of jet noise from submerged axisymmetric nozzle

1.
National Key Laboratory on Ship Vibration and Noise, China Ship Development and Design Center, Wuhan 430064, China
2.
Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China

轴对称直喷管的水下射流噪声特性数值模拟与实验验证由郉军华，等创作，采用知识共享署名4.0国际许可协议进行许可。

摘要

摘要: 目的为研究水下射流噪声特性，方法应用Lighthill声类比计算轴对称直喷管的自由射流声场特性，借助FLUENT仿真软件并采用大涡模拟法计算该直喷管的水下射流流场，最后基于混响法进行实验验证。结果结果表明：稳态射流流场的核心区长度与流速无关，核心区长度约为喷管直径的8倍；射流噪声辐射功率与流速的8次幂成正比；不同流速下的射流噪声功率谱在低频段的差异较大，在高频段的差异则显著减小，且辐射噪声能量主要集中在低频段，但流速增加后射流噪声的主要贡献将向高频段移动。结论在射流噪声计算仿真方面，将大涡模拟法和Lighthill声类比相结合是一种有效的分析手段。
- 轴对称直喷管 /
- 射流噪声 /
- 混响法
Abstract: Objectives In order to study the underwater jet noise characteristics, Methods 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. Results 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. Conclusions In terms of computing simulation of jet noise, the large eddy simulation and Lighthill acoustic analogy combined analysis is an effective means.
- axisymmetric nozzle /
- jet noise /
- reverberation method

HTML全文

图 1 流体域网格模型

Figure 1. Fluid domain model

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图 2 不同速度的稳态流场速度云图

Figure 2. Steady flow velocity contours at different velocities

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图 3 声场计算域示意图

Figure 3. Schematic diagram of sound field calculation

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图 4 声场计算流程图

Figure 4. Flow chart of sound field calculation

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图 5 入口速度为15 m/s的声压场云图

Figure 5. The sound pressure contours of inlet velocity of 15 m/s

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图 6 不同流速的辐射噪声功率谱

Figure 6. Radiated noise power spectrum at different velocities

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图 7 总辐射噪声功率的计算值与理论值对比

Figure 7. Comparison between numerical results and theoretical values of OSWL

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图 8 实验装置示意图

Figure 8. Schematic diagram of device connection

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图 9 不同流速下射流噪声声源级

Figure 9. The results of flow noise source level at different velocities

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图 10 总声源级的实验值与理论值对比

Figure 10. Comparison between experimental results and theoretical values of sound source level

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