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 x 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.
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机译：在有关刷型后缘扩展的参数研究中，确定了几种设计概念的降噪潜力。所获得的数据库代表了正在进行的项目的第一阶段，其长期目标是开发缩放定律，以便将来将此类设备用作当今飞机部件的附加解决方案。实验包括在DLR的敞开式喷气声学风洞不伦瑞克的零升程通用板模型（Re = 2.1 x 10〜6至7.9 x 10〜6）上进行声学和空气动力学测量。噪声数据是通过定向麦克风系统获取的。测量结果表明，根据配置的不同，可以显着降低10 dB以上的源噪声。确定了两种相关的降噪机制：1）抑制窄带钝度噪声，以及2）降低宽带湍流边界层后缘噪声。
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