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中文摘要：
侧空腔长度对射流挟气量及水流流态均有重要影响，采用3维数值模拟，分析了底部掺气坎尺寸对侧空腔长度的影响规律。结果表明，侧空腔长度及侧空腔形态受底部掺气坎的体型尺寸影响较大，随着底部掺气坎尺寸的增大，侧空腔长度增大，其主要原因在于底部掺气坎的尺寸会影响射流跌落至底板的位置，影响射流段动水压力的分布，从而影响射流的横向扩散速率。
英文摘要：
Based on numerical simulation, the effect of base aerator on the length of lateral cavity has been ana- lyzed. The result indicates that the size of base aerator has obvious influence on the length of lateral cavity. The bigger the base aerator is, the longer the lateral cavity. It is mainly because that, the variety of base aerator will change the pressure distributions of jet flow, which influences the diffuse velocity in the lateral direction.
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