Liner design method applied to aft-fan noise reduction was implemented.The design phases were separated into two parts. In the first phase
an empirical impedance model was adopted to get the preliminary design. In the second phase
an optimization procedure was performed by numerical simulations based on high-order computational aeroacoustic method to achieve the optimal acoustic impedance and corresponding geometry parameters.In order to validate the method
an experimental investigation of aft-fan noise was carried out in the anechoic chamber of Beijing University of Aeronautics Astronautics.The fan noise source was modeled by a mode source generated by speakers.The circumferential mode was 1 and the radial mode was 0
the frequency was 3150Hz.The Mach numbers were 0.8 and 0.6 for the core and bypass ducts respectively. Experimental results showed that the preliminary design had 10dB insertion loss and the optimized liner achieved 3-4dB more attenuation.