In order to assess the potential risk of pipeline underwater leakage, a self-designed experimental setup is carried out to study the gas release rate and dispersion behavior in different release scenarios. A transparent organic glass tank with dimension of 1 m × 0.5 m × 0.5 m (height × width × length) was placed in a wind tunnel. The release pipeline made by stainless-steel with diameter of 25 mm were used to simulate for variation release depth. The different size and shape of leakage orifices in 1 mm, 3 mm, 5 mm in round and 3.5 × 2 mm, 7 × 1 mm in rectangle were designed for comparison. The medium of methane gas was released from the controllable cylinder. The variation parameters of flow rate and pressure were measured by a flow meter and pressure gauge respectively. A high speed camera was employed to recorded the phenomenology of dispersion characteristics and breakup process for a wide range of orifice size in the time-resolved images. The dynamic plume diameter on water surface was measured by a Vernier caliper placed above the water tank. The considered factors including orifice size, leakage pressure and water depth effect on gas flow rate and dispersion behavior was quantitative investigated. The fitting correlation between the gas flow rate and variation parameters can provide fundamental information for evaluation the hazard consequences of gas release in engineering application.

为了评估管道水下泄漏的潜在风险，进行了一个自行设计的实验装置，以研究不同释放场景下的气体释放速率和扩散行为。将尺寸为1 m×0.5 m×0.5 m（高×宽×长）的透明有机玻璃罐放置在风洞中。使用直径为25 mm的不锈钢制成的释放管道来模拟释放深度的变化。为了比较，设计了不同尺寸和形状的泄漏孔，分别为圆形的1 mm，3 mm，5 mm和矩形的3.5×2 mm，7×1 mm。甲烷气体从可控气缸中释放出来。分别通过流量计和压力计测量流量和压力的变化参数。使用高速相机记录时间分辨图像中大范围孔口的色散特性和破裂过程的现象。通过置于水箱上方的游标卡尺测量水面上的动态羽流直径。定量研究了孔口尺寸，泄漏压力和水深对气体流速和扩散行为的影响因素。气体流速和变化参数之间的拟合相关性可以为评估工程应用中气体释放的危害后果提供基础信息。定量研究了孔口尺寸，泄漏压力和水深对气体流速和扩散行为的影响因素。气体流速和变化参数之间的拟合相关性可以为评估工程应用中气体释放的危害后果提供基础信息。定量研究了孔口尺寸，泄漏压力和水深对气体流速和扩散行为的影响因素。气体流速和变化参数之间的拟合相关性可以为评估工程应用中气体释放的危害后果提供基础信息。