Experimental Study of Supersonic Inlet Buzz
Experimental Study of Supersonic Inlet Buzz
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DOI：
10.2514/1.20451
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发表时间：
2006-10
期刊：
影响因子：
2.5
通讯作者：
S. Trapier;P. Duveau;S. Deck
中科院分区：
文献类型：
--
作者：
S. Trapier;P. Duveau;S. Deck
对超音速进气嗡嗡声进行了实验研究。这项研究是在一个混合压缩矩形进气道模型上进行的，试验马赫数从1.8到3，分别有和没有放气。通过纹影视频和非稳态压力记录的信号处理，对进气流动进行了分析。观察到两种嗡嗡声：“小嗡嗡声”，这被认为对应于由罩唇下的剪切层的存在而激发的声学共振现象(费里准则)，以及“大嗡嗡声”，它似乎是由压缩坡道上的边界层分离(Dailey准则)触发的。在某些情况下，几乎可以通过引入出血来抑制轻微的嗡嗡声。大嗡嗡声的频率在大振幅振荡开始之前就已经存在于气流中，这表明可能与声学有关的大嗡嗡声的潜在机制在嗡嗡声开始之前就已经存在了。
An experimental study of supersonic inlet buzz is presented. This study was carried out on a mixed compression rectangular inlet model; tests were done at Mach numbers ranging from 1.8 to 3, with and without bleed. Inlet flows were analyzed thanks to Schlieren videos and signal processing of unsteady pressure recordings. Two kinds of buzz were observed: "little buzz," which is thought to correspond to an acoustic resonance phenomenon excited by the presence of a shear layer under the cowl lip (Ferri criterion), and "big buzz," which seems to be triggered by a boundary layer separation on the compression ramps (Dailey criterion). In some cases, little buzz could be virtually suppressed by the introduction of a bleed. The frequency of big buzz is shown to be already present in the flow before the onset of large-amplitude oscillations, which suggests that the underlying mechanism of big buzz, probably linked to acoustics, already exists before buzz starts.