Abstract: The time-domain method based on the large eddy simulation is applied to predict the flow noise in variable cross-sectional area pipes. For the pipes with sudden area contraction and expansion, the numerical predictions and measured results agree reasonable well. Then the effects of connected structures of pipes on the flow noise is investigated numerically, and the variable cross-sectional area pipes with low flow-generated noise are explored.

Key words: variable cross-sectional area pipe, flow noise, numerical prediction, experimental measurement

摘要： 应用大涡模拟(LES)时域CFD方法计算变截面管道内的气流噪声，对于突缩和突扩管道，CFD计算结果和实验测量结果吻合较好，进而研究了不同的过渡形式对变截面管道内部流噪声的影响，为变截面管道的低噪声设计提供依据。

关键词: 变截面管道, 流噪声, 数值预报, 实验测量