为准确计算管道内风扇的非自由声场，结合点源模型和边界元方法探索任意边界条件下风扇噪声的计算方法。本文在验证自由空间和管道内旋转点力源声场仿真计算准确性的基础上，以轴流式管道风扇为对象，分别依据扇声源理论和点源模型计算风扇的气动声场，2种方法所得结果吻合较好，但后者方法适用更为广泛，为风扇气动声场的计算提供了新方法。最后分析风扇管道对气动声场的影响，结果表明管道对风扇声场的影响大小不仅取决于管道长度还和声源频率有关，声源频率一定时，管道越长对风扇声场的影响越明显。
In order to calculate the non-free sound field of ducted fan accurately, the calculation method of fan noise in arbitrary boundary condition is explored combing the point source model and boundary method. The sound field simulation of rotating point force in free space and in duct is validated, and then a axial-flow ducted fan is taken as the object, the aeroacoustics computed based on acoustic fan source model and point source model are in well agreement, but the latter method can be used widely, and it can provide a new method for the aeroacoustics numerical prediction of ducted fan. In the last, the influence of duct on the sound field is analyzed , the result shows that the influence of duct is not only decided by the duct length but also related with the acoustic source frequency, when the acoustic source frequency is fixed, the longer of the duct, the influence on sound field will be bigger.
2023,45(2): 71-75 收稿日期：2022-03-19
DOI：10.3404/j.issn.1672-7649.2023.02.013
分类号：TH42
基金项目：国防装备预研基金资助项目（41410030102）
作者简介：付建(1985-),男,博士,讲师,研究方向为旋转机械声场仿真与测试
