The Use of Blowing Flow Control to Reduce Bluff Body Interaction Noise
The Use of Blowing Flow Control to Reduce Bluff Body Interaction Noise
复制标题
使用吹气流量控制来减少钝体相互作用噪声
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Goodyer
中科院分区：
文献类型：
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作者：
D. Angland;Xin Zhang;M. Goodyer
当上游物体的不稳定尾流撞击下游物体时，产生的相互作用噪音可能很大。通过实验研究了通过圆柱体表面的分布吹扫来降低该噪声源的使用。两种配置进行了测试，一个与一个H-梁上游的圆柱体（表示的OH配置）和另一个与H-梁上游的圆柱体（表示的HO配置）。采用粒子图像测速技术测量了流场的平均速度和速度脉动。在OH构型中应用吹除，减小了流向雷诺应力（u 0 u 0）。这导致在斯特劳哈尔数（St）为0.2时噪声降低9.2dB。在Strouhal数范围0：05 < St < 5上平均有3dB的宽带噪声降低。吹气对高超声速结构的影响是抑制H型梁和圆柱体之间的强横流雷诺应力（w 0 w 0）。这导致在Strouhal数为0.8时噪声降低15 dB。在0：05 < St < 6：3的频率范围内平均有4.6 dB的宽带噪声降低。吹气的效果产生了额外的高频噪音。这种额外的噪音被最小化，通过具有非常小的孔径的烧结板施加吹气。
When an unsteady wake from an upstream body impinges on a downstream body, the resultant interaction noise can be significant. The use of distributed blowing through the surface of a cylinder to reduce this source of noise was investigated experimentally. Two configurations were tested, one with a cylinder upstream of an H-beam (denoted the OH configuration) and the other with an H-beam upstream of the cylinder (denoted the HO configuration). The mean velocities and velocity fluctuations were determined in the flowfield using particle image velocimetry. The application of blowing to theOHconfiguration reduced the streamwise Reynolds stress (u0u0). This resulted in a noise reduction of 9.2 dB at a Strouhal number (St) of 0.2. There was a broadband noise reduction of 3 dB averaged over a Strouhal number range 0:05 < St < 5. The effect of blowing on the HO configuration was to inhibit the strong crossflow Reynolds stress (w0w0) between the H-beam and the cylinder. This resulted in a noise reduction of 15 dB at a Strouhal number of 0.8. There was a broadband noise reduction of 4.6 dB averaged over the frequency range 0:05 < St < 6:3. The effect of blowing produced additional high-frequency noise. This additional noise was minimized with blowing applied through a sintered plate with a very small pore diameter.