【摘要】 实验研究了矩形空腔在外部高速气流作用下诱导的空腔内流动振荡问题，以及从空腔前缘加入纯音声激励以抑制空腔内流动振荡的技术。实验发现，在一定的气流速度和空腔几何尺寸下，空腔内流动会出现强烈的自持振荡。采用前缘声激励，在某些声激励频率和适当强度下，通过控制腔口前缘剪切层的初期发展，可使原来处于振荡状态下空腔内的脉动压力级峰值降低１４ｄＢ以上，线性总声压级降低５ｄＢ更多还原

【Abstract】 The flow induced oscillation in a cavity exposed to external high speed flow and its suppression by means of sound excitation at the leading edge of the cavity are experimentally studied.In the experiment it is found that at a certain external flow velocity and cavity size a strongly self sustained flow oscillation in the cavity would appear. By using the leading edge sound excitation at some frequencies with proper intensity to control the initial development of the free shear layer,the peak value of the oscillating sound pressure level in the cavity could be reduced by 14 dB,and the overall sound pressure level by 5 dB.更多还原