基于传递单元方法的局域反应声衬设计与试验

Optimization of aero-engine nacelle liners means laying the acoustic liners with the optimum impedance in the duct to minimize the noise level. The process usually needs a numerical calculation of the full-sized target. In this paper, an optimization of the locally reacting acoustic liner for the single-stage low-speed axial compressor is carried out based on the transfer element method, and is verified experimentally. It is found that the locally reacting liner has significant effect on noise reduction of target mode. The transmission loss is 44.01 dB, and the liner exhibits certain characteristics of broadband noise reduction. The experimental results are consistent with the calculation results. The actual noise reduction effect of the liner meets the design requirement, showing that the transfer element method as a fast calculation method is applicable for liner design and optimization. The method can reduce the design cost and cycle of aero-engine nacelle liners, and is suitable for engineering application.