涵道尾桨噪声辐射特性研究

摘要

The experimental and analytical investigation on ducted rotor noise is presented. A frequency domain method for predicting the ducted rotor noise is presented. The aerodynamic loads of the ducted rotor are calculated by using the panel-vortex theory. Acoustic free field due to the rotor is obtained by Farassat lA equation. The duct sound scattering effect is calculated by the boundary element method.Base on the experimental results, the ducted rotor noise is analyzed. The analytical method is validated through comparing the calculation results and experimental results.%通过理论和试验对涵道尾桨噪声辐射特性进行了研究.建立了涵道尾桨气动噪声的频域分析方法,采用面元-涡流理论计算涵道尾桨的气动载荷,采用Farassat 1A公式计算尾桨的自由声场噪声,涵道的声学散射效应通过频域的边界元法进行计算.通过对试验结果的分析研究了涵道尾桨噪声的辐射特性,并且利用试验结果对理论分析方法进行了验证.