Acoustic radiation of axisymmetric mode in subsonic jets

SONG Zhengxuan; FANG Yihong

doi:10.7638/kqdlxxb-2021.0260

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Acoustic radiation of axisymmetric mode in subsonic jets

更新时间：2026-05-28

- Acoustic radiation of axisymmetric mode in subsonic jets
- Vol. 40, Issue 6, Pages: 102-107(2022)
- 作者机构：
  
  天津大学机械工程学院高超空气动力学研究室,天津,300072
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2021.0260
  CLC： TB53
- Published：2022
- 稿件说明：
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宋正旋, 方一红. 亚声速射流轴对称模态的声辐射研究[J]. 空气动力学学报, 2022, 40(6): 102−107.

SONG Zhengxuan, FANG Yihong. Acoustic radiation of axisymmetric mode in subsonic jets[J]. 2022, 40(6): 102-107.
宋正旋, 方一红. 亚声速射流轴对称模态的声辐射研究[J]. 空气动力学学报, 2022, 40(6): 102−107. DOI： 10.7638/kqdlxxb-2021.0260

SONG Zhengxuan, FANG Yihong. Acoustic radiation of axisymmetric mode in subsonic jets[J]. 2022, 40(6): 102-107. DOI： 10.7638/kqdlxxb-2021.0260.

摘要

亚声速射流噪声危害飞行器使用寿命，影响居民生活。为了进一步研究亚声速射流的声辐射机理和声场预测，通过直接数值模拟研究了

= 0.9、

= 3600射流轴对称模态的演化；运用Wu理论模型预测远场声辐射，得到了四种情况下的声辐射强度和方向，并将这些结果与直接数值模拟结果进行对比。结果表明，不稳定波线性发展时，主波占主导地位，声源接近非紧致声源，以固定低角度（与射流轴线呈大约30°）向远场直接辐射噪声；非线性作用增强时，差频和次差频波占主导，声源略微紧致，总体声辐射方向依然是30°左右的小角度。

Abstract

The noise of subsonic jets endangers the service life of aircrafts and affects the lives of residents near the airports. To further reveal the acoustic radiation mechanism of subsonic jets and predict the sound field

a new hybrid method is developed. In this paper

the evolution of an axisymmetric mode in subsonic jets (

= 0.9

= 3600) are investigated by a direct numerical simulation (DNS). The acoustic radiation is calculated based on the acoustic model proposed by Wu and compared with the direct numerical simulation. Results show that if the primary instability waves dominate the linear process

the sound source is almost non-compact. Conversely

when the nonlinear effect needs to be taken into account

the difference frequency and sub-difference frequen

cy waves are dominant and the sound source is slightly compact. But the direction of sound radiation is nearly 30° with respect to the jet axis for both linear and nonlinear situations

which is consistent with previous results.

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Keywords

references

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