The objective of this work is to investigate the horizontal stretching effect of ground on high-pressure vapor jet of LNG tank leakage near the ground. A numerical model for leakage jet was developed and several series of leakage scenarios were theoretically analyzed for different heights of the tank orifice, inner pressures and outer temperatures. The results show that the near ground plays an important role in the horizontal transportation of LNG leakage vapor. The corresponding danger distance is surprisingly lengthened because of the horizontal stretching of leakage vapor cloud by the ground nearby, especially for those cases with a lower orifice on tank. It is illustrated that there is an obvious change for the central axis track, gas concentration and velocity of the jet in the far-field during the jet is touching the ground. In addition, the dimensionless analyses on the dependence of gas concentration, velocity and gas concentration on the transportation distance indicated that there were two stages of deflection behaviors of the jet. Finally, the enlarged danger distance by the horizontal stretching for the LNG tank leakage with a low orifice indicated the more dangerous scene of those leakage close on ground. The data and revelation here about the danger area prediction can be an important guide for the emergency management during the LNG tank leakage accidents.

这项工作的目的是研究地面对地面附近LNG储罐泄漏的高压蒸气射流的水平拉伸作用。建立了泄漏射流的数值模型，并针对罐孔的不同高度，内部压力和外部温度从理论上分析了一系列泄漏情况。结果表明，近地面在LNG泄漏蒸气水平输送中起着重要作用。由于附近地面对泄漏蒸气云的水平拉伸，相应的危险距离令人惊讶地延长了，特别是对于罐上孔口较小的情况。结果表明，在射流接触地面的过程中，远场中的射流中心线轨迹，气体浓度和射流速度都有明显变化。此外，对气体浓度，速度和气体浓度对输送距离的依赖性进行的无量纲分析表明，射流的偏转行为分为两个阶段。最后，水平延伸的低孔距LNG储罐泄漏的危险距离增大了危险距离，这表明那些泄漏在地面附近的情况更为危险。此处有关危险区域预测的数据和启示可以为LNG储罐泄漏事故期间的应急管理提供重要指导。LNG罐泄漏的低孔通过水平拉伸而增大的危险距离表明，这些泄漏在地面附近的危险性更大。此处有关危险区域预测的数据和启示可以为LNG储罐泄漏事故期间的应急管理提供重要指导。LNG罐泄漏的低孔通过水平拉伸而增大的危险距离表明，这些泄漏在地面附近的危险性更大。此处有关危险区域预测的数据和启示可以为LNG储罐泄漏事故期间的应急管理提供重要指导。