方案摘要
方案下载应用领域 | 航空航天 |
检测样本 | 航空 |
检测项目 | |
参考标准 | 暂无 |
采用一台Quantronix公司生产的Darwin Duo型双腔Nd:YLF激光器作光源。该激光器输出2 × 25 mJ 单脉冲能量,重复频率1 kHz。采用两台Photron Fastcam SA1 相机作成像器件。构成一套时间分辨高重复频率立体3维粒子成像测量系统。对NACA 0018翼型,加装整齐排列的锯齿状后缘时的流动的边界层特性和声学特性进行了测量。和未加装翼型的特性做比较,得到加装锯齿状后缘,可降低气动噪声的结论。
Trailing edge serrations designed to reduce airfoil self-noise are retrofitted on a NACA 0018 airfoil. An investigation of the boundary layer flow statistical properties is performed using time-resolved stereoscopic PIV. Three streamwise locations over the edge of the serrations
are compared. An analysis of the results indicates that, while there is no upstream effect, the flow experiences significant changes as it convects over the serrations and toward its edges. Among the most important, a reduced shear stress and modifications of the turbulence spectra suggest beneficial changes in the unsteady surface pressure that would result in a reduction of trailing edge noise. Microphone array measurements are additionally performed
to confirm that noise reduction is indeed observed by the application of the chosen serration design over the unmodified airfoil.
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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