涡扇发动机旋转声模态发生与测试试验研究

开展了涡扇发动机旋转声模态发生与测试技术研究。首先,通过对涡扇发动机旋转声模态发生与测试技术的原理分析,得出声模态发生与测试试验装置设计方法;结构设计与电气系统设计相结合,完成了试验装置的搭建;最后经过以某高阶声模态为例进行试验验证工作,证明了声模态发生与测试技术的正确性和试验装置设计的合理性。开展的声模态发生与测试技术研究对消声短舱声衬的声学效果验证试验意义重大,填补了中国该工程领域的空白,具有较好的工程应用价值。

Research on Acoustic Spinning Mode Synthesizer and Measurement Method Validating Experiment

In order to carry out the aero engine nacelle liner validating experiment, this paper put forward the development and measurement of acoustic spinning mode synthesizer. Firstly ,the design methods of mode generating and measuring were concluded by principle analyzing on turbofan engine noise formation mechanism. The correctness of acoustic spinning mode synthesizer was proven by inlet nacelle liner validation experiment on mode number 15. The Acoustic Spinning Mode Synthesizer covered mode number -15~15 and 0~20kHz. The results fills gaps in the field and will provide scientific basis for the Nacelle Liner design, Validating test technology of the nacelle liner.