考虑侧壁效应的遮檐式空腔流声耦合特性研究

  • 安宇 ,
  • 张林 ,
  • 赵佳锡 ,
  • 章荣平 ,
  • 左孔成
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  • 1. 成都理工大学
    2. 中国空气动力研究与发展中心,气动噪声控制重点实验室
    3. 中国空气动力研究与发展中心

收稿日期: 2026-06-09

  修回日期: 2026-07-22

  网络出版日期: 2026-07-24

基金资助

内外流耦合下异构空腔流激噪声机理及控制方法优化设计研究

Study on flow-acoustic coupling characteristics of overhanging lip cavity considering side wall effect

  • AN Yu ,
  • ZHANG Lin ,
  • ZHAO Jia-Xi ,
  • ZHANG Rong-Ping ,
  • ZUO Kong-Cheng
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Received date: 2026-06-09

  Revised date: 2026-07-22

  Online published: 2026-07-24

摘要

遮檐式空腔流动广泛存在于工程中,但有限宽度遮檐式空腔侧壁对流动演化和脉动压力特性的影响机制尚不明确。本文结合风洞试验与分离涡模拟(DES),研究了40 m/s-70 m/s风速下,侧壁面对遮檐式空腔脉动压力能量的空间分布与功率谱密度特性的影响,同步分析了遮檐式空腔的流声耦合机制。结果表明,低风速时,脉动压力能量的空间分布分散,近侧壁区域贡献较明显;随风速升高,低频能量逐渐向空腔中部集中。中心截面的脉动压力功率谱密度在300-450 Hz呈现显著的窄带峰值,峰值频率随风速升高而增加,高风速下增长趋缓。侧壁测点出现1220-1240 Hz的高频特征峰。受侧壁面影响,空腔壁面附近的涡结构破碎为小尺度涡,诱导侧壁面产生高频脉动压力,空腔的自持振荡与声学模态发生了流声耦合,激发脉动压力的高频离散峰。为有限宽度遮檐式空腔的设计与振荡抑制提供理论依据。

本文引用格式

安宇 , 张林 , 赵佳锡 , 章荣平 , 左孔成 . 考虑侧壁效应的遮檐式空腔流声耦合特性研究[J]. 航空学报, 0 : 1 -0 . DOI: 10.7527/S1000-6893.2026.34094

Abstract

Overhanging lip cavity flow widely exists in engineering, but the influence mechanism of the side wall of the finite-width overhanging lip cavity on the flow evolution and fluctuating pressure characteristics is not clear. In this paper, combined with wind tunnel test and detached eddy simulation ( DES ), the influence of the side wall on the spatial distribution and power spectral density characteristics of the fluctuating pressure energy of the overhanging lip cavity under the wind speed of 40 m/s-70 m / s is studied, and the flow-acoustic coupling mechanism of the overhanging lip cavity is analyzed simultaneously. The results show that the spatial distribution of fluctuating pressure energy is dispersed at low wind speed, and the contribution of near-wall region is obvious. As the wind speed increases, the low-frequency energy gradually concentrates to the middle of the cavity. The power spectral density of fluctuating pressure in the central section shows a significant narrow-band peak at 300-450 Hz. The peak frequency increases with the increase of wind speed, and the growth rate slows down at high wind speed. High-frequency characteristic peaks of 1220-1240 Hz appear at the measuring points on the side wall. Affected by the side wall surface, the vortex structure near the cavity wall is broken into small-scale vortices, which induces high-frequency fluctuating pressure on the side wall surface. The self-sustaining oscillation of the cavity and the acoustic mode have flow-acoustic coupling, which excites the high-frequency discrete peak of the fluctuating pressure. It provides a theoretical basis for the design and oscillation suppression of a finite-width overhanging lip cavity.

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