Study on leakage and diffusion law of small hole in submarine hydrogen pipeline under complex offshore water body
In order to study the gas diffusion problem of small hole leakage in underwater hydrogen pipeline of offshore wind power and hydrogen integrated energy system,a leakage and diffusion model of offshore underwater hydrogen pipeline was es-tablished by using the fluid dynamics calculation software.Considering the complex water flow,the leakage group diffusion be-havior under different water depths and water flow velocities was simulated and analyzed,and the factors such as underwater gas leakage and diffusion behavior,floating time and influence range of water surface diffusion were studied.The results show that the underwater gas leakage is plume-like,which shifts with the downstream direction of water flow,and a certain range of diffusion and boiling area is formed on the water surface.The initial kinetic energy of the leakage gas decays rapidly,and the floating time is mainly controlled by the water depth.There is the obvious deviation phenomenon of water flow to gas plume,and it is positively correlated with water flow velocity,which also increases the influence range of water surface diffusion.A multivariate nonlinear prediction equation of water surface diffusion and leakage parameters based on the water flow velocity and leakage source depth is constructed,which can better predict the key parameters of water surface after leakage.The re-search results can provide a theoretical basis for the establishment of offshore wind power and hydrogen storage integrated sys-tem and accident emergency response in China.
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