基于CFD/CAA耦合边界方法的翼型尾缘噪声预测

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基于CFD/CAA耦合边界方法的翼型尾缘噪声预测

卢蕊; 丁永乐; 余培汛; 谭坤; 潘光

西北工业大学学报, 2023, Volume: 41, Issue: 2

Journal Article

TJ762.4; 基于声波边界条件的流致噪声混合预测方法是一种处理复杂构型声学问题的数值手段.该方法可进行声源的精细化模拟,准确获得噪声的传播特性.发展了声扰动方程离散求解中所涉及的时空离散格式及边界条件等数值方法,提出通过添加缓冲层等策略以改善声源区与传播区交界处数值间断引起的发散问题,以建立高精度流致噪声混合预测方法.为了研究混合方法的准确性,以BANC试验中的NACA0012 翼型为研究对象,开展了翼型尾缘的声辐射数值模拟研究分析.通过与大涡模拟方法所求解的声场结果进行对比,验证了基于声波边界条件的高精度流致噪声混合预测方法可准确预测空间声场分布,并直观反映声波与声波之间的相互作用现象.与大涡模拟结果相比,CFD/CAA方法总声压级误差不超过2 dB,噪声指向性分布趋势一致.

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