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自然界中天然气的泄漏往往伴随着有风天气,风力的作用会给天然气的泄漏及扩散过程带来更复杂的影响。本文采用CFD数值模拟方法,分析风速对天然气泄漏过程地影响。研究结果发现,当风速为0 m/s时,气体的速度以及甲烷的扩散方向主要是垂直方向;而当风速达到5 m/s时,在风力的作用下,气体速度场明显发生倾斜,并且在泄漏孔附近形成较大的偏转和涡旋,同时,甲烷向计算区域的右侧扩散,并且在喷孔右侧区域形成一定的涡旋,使得甲烷的扩散速度加快。这一现象说明了自然风速越大,甲烷扩散越快,有利于甲烷等污染物在大气中尽快扩散,避免造成更大的损失。
Natural gas leakage is often accompanied by windy weather, and the effect of wind energy will have a more complicated impact on the leakage and diffusion of natural gas. In this paper, CFD numerical simulation method to analyze the impact of wind speed on the natural gas leakage process. The results show that when the wind speed is 0 m / s, the gas velocity and the methane diffusion direction are mainly vertical. When the wind speed reaches 5 m / s, the gas velocity field is obviously tilted under the wind force, and Large vortices and vortices are formed near the leak holes. At the same time, methane diffuses to the right side of the calculation area and a certain vortex forms on the right side of the injection hole, resulting in faster methane diffusion. This phenomenon shows that the greater the natural wind speed, the faster the methane diffusion is conducive to methane and other pollutants in the atmosphere as soon as possible to spread, to avoid causing greater losses.