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中文摘要：
为避免成穴的空气乘火车。损坏广泛地在长自由的流动隧道被使用了。决定通风装置是否为更短的隧道被需要是关键的。在这篇文章，在 Longtan 水力发出的电力车站的下出料隧道被包含，为哪个免费流动隧道节仅仅长是 50.00 m。在有或没有通风装置的隧道的成穴用规模 1/30 的物理模型被调查，通过成穴噪音的大小。试验性的结果证明在免费流动节的入口放通风装置让更高的水库水平保护这条隧道免受成穴损坏的伤害是必要的。
英文摘要：
The air entrainment for avoiding cavitation damage has been widely used in long free flow tunnels. It is crucial to determine whether an aerator is needed for shorter tunnels. In this article, the bottom discharge tunnel at the Longtan Hydropower Station was involved, for which the free flow tunnel section was only 50.00 m long. The cavitation in the tunnel with and without the aerator was investigated using the physical models of the scale 1/30, through the measurements of cavitation noise. The experimental results show that it is necessary to place the aerator at the inlet of the free flow section for higher reservoir level to protect this tunnel from cavitation damage.
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