关键词: 开式转子, 气动噪声, 风洞试验, 声学风洞, 阶次分解

Abstract: Open rotor has high propulsion efficiency and is an important development direction in aero engine field. However, the aerodynamic interference of open rotor is complicated and the radiated aerodynamic noise is strong, which makes the aerodynamic noise become the key problem in the development of open rotor engine. In order to evaluate the aerody-namic noise characteristics of the open rotor, verify the aerodynamic noise prediction method of the open rotor, and analyze the aerodynamic noise mechanism of the open rotor, the aerodynamic noise test Investigation of typical open rotor was carried out in the 5.5m x4m acoustic wind tunnel by using a newly developed high-power open rotor dynamic simulation test device. The wind tunnel test data processing method of open rotor aerodynamic noise is estab-lished, the order decomposition method of open rotor aerodynamic noise is developed, and the characteristics and mechanism of open rotor aerodynamic noise are systematically studied. The results show that the separation error of different orders of tone for open rotor is less than 0.26dB. The aerodynamic noise of open rotor is rich and obvious, and covers a wide frequency range, and single frequency noise is the main noise source of open rotor. The total noise and single-frequency noise of the open rotor mainly propagate towards the radiation Angle of 90°, the wide frequency noise mainly propagates towards the rear of the propeller plane, and the single tone of front propeller and rear propeller mainly propagate towards the radiation Angle of 70°to 110°.

Key words: open rotor, aerodynamic noise, wind tunnel test, acoustic wind tunnel, order decomposition