Research on Design Technology of Aeroengine Acoustic Modes Synthesizer

Aiming at the problem of loading noise sources in turbofan engines, a design technology for radial acoustic mode synthesizer is proposed based on the sound pressure solution of any point in the duct under the action of multiple point sound sources. This method includes two methods based on direct problem and one method based on inverse problem. These methods have been validated through numerical simulation or experiments, and all three methods can control radial acoustic modes. Relatively speaking, due to the consideration of system error in the method based on inverse problem, its control accuracy is high, and the acoustic mode resolution reaches 10dB, which can achieve simultaneous control of circumferential and radial acoustic modes. The system debugging workload is small, and it can be widely used.