方案摘要
方案下载应用领域 | 其他 |
检测样本 | 其他 |
检测项目 | |
参考标准 | 暂无 |
The present research examines the relationship between the large-scale structure dynamics of a controlled jet and the far-field sound. This was achieved by exploring the flowfield and the far field of an axisymmetric Mach 0.9 jet with a Reynolds number based on jet diameter of approximately 7.6 x 105. The jet is controlled by eight localized arc filament plasma actuators (LAFPA), which operate over a frequency range that spans the jet column instability, the initial shear layer instability, and higher. Varying the phase between the eight actuators allows excitation of azimuthal modes (m) 0, 1, 2, and 3. The flowfield is investigated using flow visualization and particle image velocimetry (PIV). A Reynolds decomposition of the PIV results showed the importance of the streamwise velocity fluctuations for the symmetric azimuthal modes (m = 0 and 2), and the cross-stream velocity fluctuations for the asymmetric azimuthal modes (m = 1 and 3). A proper orthogonal decomposition (POD) of the PIV data was performed to extract information about how forcing affects the large-scale flow features. The first POD mode based on v′ shows the existence has large-scale flow features from forcing over a large range of StDF’s (0.09 to 1.08), while the first POD mode based on u′ only has large-scale flow features from forcing around the preferred StDF of 0.36.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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