环境因素对液氧泄漏扩散过程影响的数值研究

A numerical simulation study is carried out to investigate the leakage problem of cryogenic liquid oxygen propellant in the process of transportation, storage and filling. The slip velocity of gas-liquid two phases and the phase transformation of water vapor is considered and the mixture multiphase flow model is used to study the change process of the ground liquid tank, oxygen concentration field and temperature field after the liquid oxygen leakage, as well as the influence of environmental temperature, atmospheric pressure, wind speed and other factors on the liquid oxygen leakage and diffusion process. After the leakage of liquid oxygen for about 35 s, the flow field reaches a quasi-stable state, and the distribution of liquid pool, temperature field and concentration field are basically unchanged. The increase of ambient temperature from 278 K to 308 K promotes the process of liquid oxygen endothermic evaporation, and the maximum oxygen concentration near the ground increases from 44.71% to 47.1%. The increase of wind speed from 0 m/s to 10 m/s accelerates the dilution and diffusion speed of oxygen masses. The damage range of low temperature decreases from 175.4 m² to 32.81 m², and the dangerous concentration area decrease from 257.0 m² to 50.70 m². When the atmospheric pressure increases from 0.09 MPa to 0.1 MPa, the maximum distance of low temperature damage range decreases from 26.5 m to 20.05 m, and the maximum distance of dangerous concentration area decreases from 38.81 m to 30.82 m. When the relative humidity of the atmosphere increases from 20% to 100%, the dilution and diffusion of oxygen clusters are inhibited, and the longest distance of the dangerous concentration area increases from 37.67 m to 39.24 m. The research results of this paper provide theoretical support for the subsequent development of liquid oxygen leakage tests, and have guiding significance for the emergency treatment of liquid oxygen leakage accidents.