An MDOE Assessment of Nozzle Vanes for High Bypass Ratio Jet Noise Reduction
An MDOE Assessment of Nozzle Vanes for High Bypass Ratio Jet Noise Reduction
复制标题
对喷嘴叶片进行高涵道比射流降噪的 MDOE 评估
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Bridges
中科院分区：
文献类型：
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作者：
B. Henderson;T. Norum;J. Bridges
研究了在BPR-8同环喷管模型系统风扇气流中放置翼型叶片对喷流噪声的影响。实验采用现代实验设计方法，研究了在典型起飞条件下一系列叶片参数对降噪效果的影响。试验结果表明，叶片的安装降低了下游峰值噪声方向的低频噪声辐射，增加了上游方向的高频噪声辐射。结果还表明，叶片结构的选择不当会导致上游方向的低频噪声辐射增加。结果表明，大迎角可以降低峰值喷流噪声角附近的噪声，增加上游方向的噪声。MDOE分析得出了将感知噪声水平降至最低的最佳设计。使用BPR 5喷嘴系统获得的有限数据表明，与BPR 8型号相比，对于旁路比较低的喷嘴，叶片可产生更好的降噪效果。
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.