声激励下的剪切流稳定性

陈效鹏; 崔率; 万振华; 胡海豹

doi:10.7638/kqdlxxb-2020.0342

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声激励下的剪切流稳定性

专栏——格子玻尔兹曼方法及应用 | 更新时间：2026-05-28

- 声激励下的剪切流稳定性
- Numerical simulation on shear flow instability induced by sound waves
- 空气动力学学报 2022年40卷第3期页码：130-139
- 作者机构：
  
  1. 西北工业大学航海学院,西安,710072
  2. 西北工业大学力学与土木建筑学院,西安,710072
  3. 中国空气动力研究与发展中心气动噪声控制重点实验室,绵阳,621000
  4. 中国科学技术大学近代力学系,合肥,230027
- 作者简介：
  
  陈效鹏*（1976-），江苏无锡人，博士，教授，研究方向：计算流体力学. E-mail：xchen76@nwpu.edu.cn
  胡海豹*（1979-），河南邓州人，博士，教授，研究方向：海洋工程. E-mail：huhaibao@nwpu.edu.cn
- 基金信息：
  
  国家自然科学基金（11872315，52071272，12102357，12102358）;基础前沿项目（JCKY2018-18）;陕西省自然科学基础研究计划资助项目（2020JC-18）;河南省水下智能装备重点实验室开放基金（KL01B2101）;气动噪声控制重点实验室开放课题（ANCL20210303）
- DOI：10.7638/kqdlxxb-2020.0342
  中图分类号： V211.71;V211.74
- 纸质出版：2022
- 稿件说明：
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陈效鹏, 崔率, 万振华, 等. 声激励下的剪切流稳定性[J]. 空气动力学学报, 2022, 40(3): 130−139.

CHEN Xiaopeng, CUI Shuai, WAN Zhenhua, et al. Numerical simulation on shear flow instability induced by sound waves[J]. 2022, 40(3): 130-139.
陈效鹏, 崔率, 万振华, 等. 声激励下的剪切流稳定性[J]. 空气动力学学报, 2022, 40(3): 130−139. DOI： 10.7638/kqdlxxb-2020.0342

CHEN Xiaopeng, CUI Shuai, WAN Zhenhua, et al. Numerical simulation on shear flow instability induced by sound waves[J]. 2022, 40(3): 130-139. DOI： 10.7638/kqdlxxb-2020.0342.

摘要

受控小扰动对流动稳定性与流场结构的调制作用具有潜在价值，但机理和失稳过程目前尚未完全明确。采用格子Boltzmann数值方法，对声场扰动条件下平行剪切流失稳过程开展了直接模拟研究，探讨了流动失稳的机理。研究表明，点源声场作用下的剪切流失稳形式依赖于激励声波的波长—文中定义为长波模式和短波模式，声波振幅的空间分布不均匀性是剪切层失稳的重要诱因。在短波模式下，受多普勒效应影响，剪切层上下两侧声波叠加效应导致流动上游区域压力脉动的波包结构；该结构的波长与剪切层失稳波长匹配，诱导流动失稳发生。在长波模式下，剪切层上声源垂直入射区首先失稳，剪切层对声波反射的方向选择性导致声压波动振幅分布的对称性破缺，且失稳区压力波动波长随时间推进而逐渐减小。当该波长落入剪切层失稳波长范围内时，剪切层流动开始失稳。

Abstract

Controlled instability of parallel shear flows induced by weak disturbances is of great academic and pragmatic importance in fluid dynamics and industrial applications. However

the underline mechanism is still not fully understood yet. Consequently

this paper intends to explore the mechanism of sound-induced shear flow instability by a lattice Boltzmann simulation. It is found that the spatial inhomogeniety of sound-wave amplitudes plays a key role in the instability process. There are two types of developing of Kelvin-Helmholtz instability depending on the wave length of sound wave

namely the long- and short-wave modes. In the short-wave mode

the Doppler effect causes deviation of wave number of the sound in the upper and lower layers

respectively. The interference between the sound waves generates sound wave packets in the shear layer

which further induces flow instability if the length scale of the wave packet matches the unstable wave length of the shear layer. In the long-wave mode

unstable waves develop below the sound source. Sound waves are reflected by the shear layer nonuniformly. The symmetric distribution of the sound pressure is broken. On the other hand

the wave length of the distributed pressure wave decreases with time due to nonlinearity.

关键词

Keywords

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