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本文提出了光滑管内湍流自由旋流旋流数ＳＷ沿轴向衰减规律的近似解。Ｓｗ的衰减与雷诺数Ｒｅ有关，Ｒｅ越小，其衰减的速度越快。增加Ｒｅ可延缓Ｓｗ的衰减。
In this paper, an approximate solution of the decay law of SW in free-swirling swirling flow in a smooth tube is proposed. The attenuation of Sw is related to the Reynolds number Re, the smaller Re is, the faster its attenuation speed is. Increasing Re delays the attenuation of Sw.