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An MDOE Assessment of Nozzle Vanes for High Bypass Ratio Jet Noise Reduction

机译:MDOE评估喷嘴叶片的高旁通比降低喷气噪声的评估

摘要

The effect of airfoil-shaped vanes placed in the fan stream of a BPR 8 coannular nozzle model system on the resulting jet noise was investigated. The experiments used a Modern Design of Experiments approach to investigate the impact of a range of vane parameters on the noise reduction achieved at representative takeoff conditions. The experimental results showed that the installation of the vanes decreased low frequency noise radiation in the downstream peak-noise direction and increased high frequency noise in the upstream direction. Results also showed that improper selection of the vane configuration resulted in increased low frequency noise radiation in the upstream direction. Large angles of attack are shown to reduce noise near the peak jet noise angle and increase noise in the upstream direction. The MDOE analysis yields an optimum design that minimizes perceived noise levels. Limited data taken with a BPR 5 nozzle system showed that the vanes result in better effective perceived noise reduction for lower bypass ratio nozzles than for the BPR 8 model.
机译:研究了放置在BPR 8环形喷嘴模型系统的风机流中的翼型叶片对产生的射流噪声的影响。实验采用了“实验的现代设计”方法来研究一系列叶片参数对有代表性的起飞条件下降噪的影响。实验结果表明,叶片的安装减少了下游峰值噪声方向的低频噪声辐射,并增加了上游方向的高频噪声。结果还表明,叶片配置的选择不当会导致上游方向的低频噪声辐射增加。大的迎角被显示为减少峰值喷射噪声角附近的噪声并增加上游方向的噪声。 MDOE分析产生了一种最佳设计,可将感知到的噪声水平降至最低。使用BPR 5喷嘴系统获取的有限数据显示,与BPR 8型号相比,对于较低的旁通比喷嘴,叶片可导致更好的有效感知噪声降低。

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