湍流边界层脉动压力对声强测量的影响研究(英文)  

Influence of the Turbulent Boundary Layer Pressure Fluctuation on the Sound Intensity Measurement in a Mean Flow

作　　者：史小军[1] Finn JACOBSEN 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]丹麦技术大学声学系,丹麦2800

出　　处：《船舶力学》2010年第3期314-323,共10页Journal of Ship Mechanics

摘　　要：实际声强测量时常常存在风流或水流,如在飞机或船舶上进行测量,声强探头将受到湍流边界层脉动压力的影响。如何评估该影响以及如何修正测量结果是人们十分关心的工程实用问题。该文首先简要介绍了建立的由湍流边界层脉动压力诱发声强的理论模型。接着利用现有的湍流边界层脉动压力频率-波数谱模型,对湍流边界层脉动压力及其诱发的声强进行了数值分析。为了验证理论模型及数值结果,设计制作了一套实验装置,对湍流边界层脉动压力及其产生的声强进行了具体测量分析。结果表明,湍流边界层脉动压力的测量结果与数值结果吻合良好,测量得到的边界层脉动压力诱发的声强特性与计算结果也十分一致,但必须注意对测量传感器的空间响应进行修正。On measuring the sound intensity in a flow the influence of turbulent boundary layer（TBL） pressure fluctuation is a subject of practical concern.In this paper,the model of the sound intensity caused by the TBL pressure fluctuation is described firstly.Based upon the developed model,the sound intensity caused by the TBL pressure fluctuation is calculated using the available models of the wave-vector frequency spectra of the TBL pressure fluctuation.In order to validate the model and the numerical results,a series of measurements was carried out.It is shown that the calculated results of the TBL pressure fluctuation agree fairly well with the measured results which are corrected with the estimated spatial response function of the microphone.Also,the characteristics of the measured sound intensity are consistent with that of the calculated sound intensity.

关 键 词：声学 声强 湍流边界层 脉动压力 

分 类 号：TB52[理学—物理]