The time-domain CFD method based on the large eddy simulation (LES) is applied to predict the flow noise in pipes with variable cross-sectional area.For the pipes with sudden area contraction and expansion, the numerical predictions agree with the experimentally measured results very well.Afterwards, the affects of pipe' s connection structures on the flow noise are investigated numerically.This work provides a reference for low-noise design of pipes with variable cross-sectional area.%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.
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