方案摘要
方案下载应用领域 | 航空航天 |
检测样本 | 航天 |
检测项目 | |
参考标准 | 暂无 |
采用NewWave公司GeminiII型Nd:YAG 双脉冲PIV激光器作光源。1016 × 1008 pixel 分辨率Kodak ES 1 Megaplus型相机做成像部件。LaVision的DaVis 软件平台做全部的数据处理,对跨音速矩形腔体流动中锯齿形阻流板性能的比例效应,进行了实验测量和研究。
An experimental study was conducted on the effectiveness of sawtooth spoilers at suppressing acoustic tones within a rectangular cavity with a length-to-depth ratio of five and a width-to-depth ratio of two, operating at a freestream Mach number of 0.71. Whereas previous research has focussed on the ratio of spoiler height to boundary-layer thickness (h/δ), this study also considers the effect of the ratio of cavity length to boundary-layer
thickness (L/δ). Using a combination of unsteady pressure measurements and particle image velocimetry, it was established that consideration of the magnitude of both parameters is important when designing passive control methods for transonic cavities. A correlation was developed which suggests that in order to suppress fully the cavity tones, a critical spoiler height, hcr, is defined such that hcr/δ = 0.065 ≤ L/δ ≤ 0.082.
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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