英语翻译中文四

来源：百度知道 编辑：UC知道 时间：2024/08/23 22:04:02
The background noises of the open jet wind tunnel were rst measured in the absence of the airfoil at the jet speeds, vj of
33.3 m/s and 80 m/s. The airfoil, with rough sandpaper placed near the leading edge on both the pressure and suction sides to trip the boundary layer into becoming turbulent, was then attached to the
sidewalls and the measurement repeated at vj = 33.3 m/s. The
resulting narrowband noise spectra are plotted in Fig. 13b. Also
shown in the gure are the predictions of trailing edge self-noise spectra obtained from the empirical prediction scheme developed by Brooks et al. [6] as well as the background noise. The result sug- gests that, in the low frequency range between 100 Hz and 400 Hz, airfoil leading edge noise (triggered by the impingements of exit jet and the side plate turbulent boundary layers on the leading edge) and the side plate edge noise are the dominant noise sources. At higher fr

The background noises of the open jet wind tunnel were rst measured in the absence of the airfoil at the jet speeds, vj of 33.3 m/s and 80 m/s. 开放式风洞的背景噪声在射流速度vj为33.3m/s和80m/s时，在不存在机翼的情况下进行了（rst）测量。The airfoil, with rough sandpaper placed near the leading edge on both the pressure and suction sides to trip the boundary layer into becoming turbulent, was then attached to the sidewalls and the measurement repeated at vj = 33.3 m/s. 然后将机翼附于侧壁，在33.3 m/s的射流速度下重复进行测量，机翼在靠近前缘压力侧和吸入侧放上粗糙的砂纸，以使边界层跳脱（trip）成湍流的。The resulting narrowband noise spectra are plotted in Fig. 13b.结果的窄带噪声谱示于图13b。 Also shown in the gure are the predictions of trailing edge self-noise spectra obtained from the empirical prediction scheme developed by Brooks et al. [6] as well as the background noise. 图中还示出了拖尾边缘的自噪声谱的预测值，它们来自于Brooks等人开发的经验预测方案【6】，以及示出了背景噪声。The result sug- gests that, in the low frequency range between 100 Hz and 400 Hz, airfoil leading edge noise (triggered by the impingements of exit jet and the side pl