Experimental investigations in low-noise trailing-edge design
Experimental investigations in low-noise trailing-edge design
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DOI：
10.2514/1.11101
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发表时间：
2004-05
影响因子：
6
通讯作者：
M. Herr;W. Dobrzynski
中科院分区：
文献类型：
--
作者：
M. Herr;W. Dobrzynski
在对刷型尾缘扩展的参数化研究中，确定了几种设计概念的降噪潜力。获得的数据库代表了一个正在进行的项目的第一阶段，其长期目标是为这些设备的未来应用开发缩放规律，作为当今飞机部件的附加解决方案。实验包括在零升力通用板模型（Re = 2.1 × 10.6至7.9 × 10.6）上的声学和空气动力学测量，该模型位于DLR的开放式喷气气动声学风洞布伦瑞克。噪声数据由定向传声器系统采集。测量结果表明，根据配置，有超过10 dB的显著源噪声降低潜力。确定了两种相关的降噪机制：1)窄带钝性噪声的抑制；2)宽带湍流边界层尾缘噪声的降低。
Within a parametric study on brush-type trailing-edge extensions, the noise reduction potential of several design concepts was determined. The obtained database represents the first phase of an ongoing project with the long-term objective to develop scaling laws for a future application of such devices as add-on solutions for today's aircraft components. The experiments comprised both acoustic and aerodynamic measurements on a zero-lift generic plate model (Re = 2.1 x 10 6 to 7.9 × 10 6 ) in DLR's open jet Aeroacoustic Wind Tunnel Braunschweig. Noise data were taken by means of a directional microphone system. Measurement results indicate a significant source noise reduction potential in excess of 10 dB, depending on the configuration. Two relevant noise reduction mechanisms were identified: 1) the suppression of narrowband bluntness noise, as well as 2) the reduction of broadband turbulent boundary-layer trailing-edge noise.