航空发动机喷流噪声近场测试研究

Near field measurement of jet noise in aero-engine

为促进航空发动机喷流噪声测试技术发展,利用小涵道比涡扇发动机户外露天静态地面试验进行了喷流噪声近场测试。运用弧形麦克风阵列测试技术,对喷流噪声近场特性进行研究,获得了发动机多个状态下的喷流噪声数据,分析整理得到了喷流噪声的频谱结构特性及近场辐射特性。最后运用Beamforming技术进行了喷流噪声成像识别,对喷流噪声的频率-位置特性进行了显示。为航空发动机喷流噪声测试技术相关研究奠定了基础。

In order to promote the development of aero-engine jet noise measurement technology, the jet noise of a low bypass ratio turbofan engine outdoor static ground test were measured in near-field. The near-field characteristics of jet noise were studied by arc microphone array measurement technology to obtain the jet noise data under multiple engine states. And spectrum structure characteristics of jet noise and the near field radiation characteristics were sorted and analyzed. Finally the image recognition of jet noise was carried out by Beamforming technology, and the frequency-position characteristics of jet noise were displayed, that would lay a certain engineering and technical foundation for the related research of aero-engine jet noise in the future.