转静干涉纯音是风扇噪声中的主要分量，深入理解转静干涉纯音的产生机理并进行高精度的模拟和预测，是学术界和工业界共同关注的话题。采用高阶谱差分方法对风扇转静干涉纯音进行高精度数值模拟。与实验结果相比，数值模拟准确预测了转静干涉纯音的主要模态分量，前3阶叶片通过频率（BPF）噪声主模态的声功率级误差分别为-1.2、+0.8、-2.1 dB；前3阶BPF噪声的所有“截通”模态中，声功率级误差低于5 dB的模态数量占比分别为86%、35%和30%。对静子表面噪声源分布进行分析，结果表明，BPF噪声源主要集中在静子前缘区域，主要来源于转子尾迹和叶尖泄漏涡与静子叶片的相互作用以及静子前缘压力面附近的非定常分离泡。

The rotor-stator interaction pure tone is a major component of fan noise. A deep understanding of its generation mechanism， and high-precision simulation and prediction are topics of mutual concern in both academia and industry. The high-order spectral difference method is used to conduct high-precision numerical simulations of fan rotor-stator interaction pure tone. Compared with experimental results， the numerical simulations accurately predict the main mode components of the rotor-stator interaction pure tone. The sound power level errors for the first three Blade Passing Frequency （BPF） dominant modes are -‍1.2， +0.8， -‍2.1 dB， respectively. Among all the “CUT-ON” modes within the first three BPFs， the proportion of modes with PWL error below 5 dB is 86%， 35%， and 30%， respectively. Detailed analysis of the distribution of BPF noise sources on the stator surface reveals that the BPF noise sources are primarily concentrated at the leading-edge region of the stator， originating primarily from the interactions between rotor wake and blade tip leakage vortices with stator blades， as well as unsteady separation bubbles near the pressure side of the stator leading edge.