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水中开孔腔流激振荡控制实验研究

章文文 徐荣武 何琳 潘龙德 赵佳锡

章文文, 徐荣武, 何琳, 潘龙德, 赵佳锡. 水中开孔腔流激振荡控制实验研究. 力学学报, 2021, 53(10): 1-$article_lastpage doi: 10.6052/0459-1879-21-143
引用本文: 章文文, 徐荣武, 何琳, 潘龙德, 赵佳锡. 水中开孔腔流激振荡控制实验研究. 力学学报, 2021, 53(10): 1-$article_lastpage doi: 10.6052/0459-1879-21-143
Zhang Wenwen, Xu Rongwu, He Lin, Pan Longde, Zhao Jiaxi. Experimental investigation into the control of flow-induced oscillations of underwater aperture-cavities. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(10): 1-$article_lastpage doi: 10.6052/0459-1879-21-143
Citation: Zhang Wenwen, Xu Rongwu, He Lin, Pan Longde, Zhao Jiaxi. Experimental investigation into the control of flow-induced oscillations of underwater aperture-cavities. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(10): 1-$article_lastpage doi: 10.6052/0459-1879-21-143

水中开孔腔流激振荡控制实验研究

doi: 10.6052/0459-1879-21-143
基金项目: 国家自然科学基金项目(No. 11904407)资助
详细信息
    作者简介:

    徐荣武, 研究员, 主要研究方向: 振动与噪声控制. E-mail: rongwu_xu@126.com

  • 中图分类号: O352

EXPERIMENTAL INVESTIGATION INTO THE CONTROL OF FLOW-INDUCED OSCILLATIONS OF UNDERWATER APERTURE-CAVITIES

  • 摘要: 水中开孔腔流激振荡是水下航行器的一类突出噪声源. 为探究有效抑制水中开孔腔流激振荡的控制方法和作用特性, 首先以水下航行器的表面开孔结构为对象设计了开孔腔模型, 并提出一种基于来流边界层分流原理的流动控制装置——前缘分流体, 借助循环水洞装置对水中开孔腔的流激振荡特性及其控制进行了实验研究. 通过沿流向和展向安装于腔底的动态压力传感器测量腔内脉动压力, 分别从腔内脉动压力的频谱特性和空间分布特性两方面, 探讨了水中开孔腔在不同流速下的流激振荡特性和前缘分流体对水中开孔腔流激振荡的控制效果, 并对前缘分流体的主要作用机理进行了分析. 研究结果表明: 水中开孔腔流激振荡形式以剪切层自持振荡为主, 在流速较低时, 如2.4 m/s, 就会产生稳定的自持振荡, 且具有随流速升高而急剧增大的趋势; 前缘分流体对水中开孔腔绕流自持振荡具有良好的抑制效果, 且抑制效果随流速增加而显著提升, 对腔内脉动压力频谱峰值和总级的最大抑制量分别达到25.3 dB和15.6 dB; 此外, 前缘分流体对开孔腔流激振荡具有低频频移作用, 有益于避免发生流激空腔共振; 脉动压力空间分布特性表明, 前缘分流体对水中开孔腔流激振荡抑制机理主要在于破坏了腔内流场受到的周期调制作用.

     

  • 图  1  NUE循环水洞

    Figure  1.  NUE Water Tunnel

    图  2  实验开孔腔模型及关键尺寸参数(单位为毫米)

    1-1—压力传感器安装; 2-2—前缘分流体安装

    Figure  2.  The aperture-cavity model and key geometry parameters in experiments (units in millimeter)

    1-1—Installation of pressure transducers; 2-2—Installation of Leading-edge Flow Splitter

    图  3  实验开孔腔模型三维示意图

    Figure  3.  3D sketch maps of the aperture-cavities in experiments

    图  4  开孔腔模型安装实物图

    Figure  4.  Installation of the aperture-cavity model

    图  5  传感器测点布置

    Figure  5.  Arrangements of transducers

    图  6  信号采集系统

    Figure  6.  Set-up of signal collection system

    图  7  流激空腔振荡作用机制示意图

    Figure  7.  Sketch map of the mechanism of flow-induced cavity oscillation

    图  8  壁面脉动压力频谱随流速变化云图(白色圆圈对应于各流速下的频谱峰值)

    Figure  8.  Spectral Contour of wall pressure fluctuations as a function of freestream velocity (the white circles correspond to the peak of spectrum at different velocities)

    图  9  典型来流速度下壁面脉动压力PSD*

    Figure  9.  PSD* of wall pressure fluctuations at typical freestream velocities

    图  10  不同流速下开孔腔绕流自持振荡频率分布(${f_{1{\rm{st}}}}$${f_{{\rm{2nd}}}}$分别为基准开孔腔一阶和二阶自持振荡频率, ${f_{{\rm{control}}}}$为控制开孔腔自持振荡频率)

    Figure  10.  Frequencies of self-sustained oscillation of aperture-cavity flow versus freestream velocity (${f_{1{\rm{st}}}}$&${f_{{\rm{2nd}}}}$ are the frequencies of first and second self-sustained oscillation of baseline case, respectively; ${f_{{\rm{control}}}}$ is the frequency of self-sustained oscillation of controlled case)

    图  11  脉动压力总级和最大PSD*随流速变化曲线

    Figure  11.  OASPL and PSD* of wall pressure fluctuation versus freestream velocity

    图  12  脉动压力衰减量随流速变化曲线

    Figure  12.  Attenuation of wall pressure fluctuation versus freestream velocity

    图  13  不同流速下腔底压力载荷系数空间分布

    Figure  13.  Spatial distribution of ${C_{prms}}$ on the cavity floor at different freestream velocities

    图  14  腔底压力载荷抑制效果

    Figure  14.  Suppression of pressure load on the cavity floor

    图  15  P1测点和P7测点压力信号相关性分析(☆基准空腔, ○控制空腔)

    Figure  15.  Cross-correlation analysis of pressure signals of P4 and P7(☆Baseline cavity, ○Controlled cavity)

    表  1  腔底传感器安装位置

    Table  1.   Location of the floor mounted transducers

    TagsP1P2P3P4P5P6P7
    x/L−2.28−1.52−0.7600.761.522.28
    y/W0000000
    TagsP8P9P10P11
    x/L0000
    y/W−0.43−0.210.210.43
    下载: 导出CSV

    表  2  自持振荡一阶模态频率实验值和预测值对比

    Table  2.   Comparison of 1st mode frequency of self-sustained oscillation between experimental values and predicted values

    ${U_\infty }$/(ms−1)${f_{1,\exp }}$/Hz${f_{1,pre}}$[Eq.(12)]
    /Hz
    ${f_{1,pre}}$[Eq.(13)]
    /Hz
    Error/%
    Eq.(12)Eq.(13)
    2.019.518.321.3−69.1
    2.42422.025.5−8.36.4
    2.828.525.729.8−104.5
    3.232.529.334.−9.84.7
    3.6363338.3−8.46.3
    4.03936.642.5−69.1
    4.44140.346.8−1.114.1
    下载: 导出CSV

    表  3  自持振荡二阶模态频率实验值和预测值对比

    Table  3.   Comparison of 2nd mode frequency of self-sustained oscillation between experimental values and predicted values

    ${U_\infty }$/(ms-1)${f_{2,\exp }}$/Hz${f_{2,pre}}$[Eq.(12)]
    /Hz
    ${f_{2,pre}}$[Eq.(13)]
    /Hz
    Error/%
    Eq.(12)Eq.(13)
    3.26165.769.17.813.2
    3.667.57477.79.615.1
    4.075.582.286.38.814.3
    4.48290.49510.215.8
    下载: 导出CSV

    表  4  从互相关分析估算的自持振荡主导模态频率

    Table  4.   Dominant mode frequencies of self-sustained oscillations estimated from cross-correlation analysis

    ${U_\infty }$/(ms-1)Time lag/msEstimated ${f_{dom}}$
    /Hz
    ${f_{dom}}$ obtained
    from PSD/Hz
    3.232.8730.4232.5
    3.629.447433.9736
    4.013.127476.1875.5
    4.412.177482.1182
    下载: 导出CSV
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  • 收稿日期:  2021-04-08
  • 录用日期:  2021-08-20
  • 网络出版日期:  2021-08-24

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