Numerical simulation and visual experiment of solid air growth process in liquid hydrogen
Solid air has become one of the key factors restricting the extensive safe application of liquid hydrogen propellant.However,the understanding of solid air characteristics still needs to be deepened.Therefore,numerical simulation and low-temperature visual experiments are used to investigate solid air's oxygen and nitrogen distribution and growth characteristics.The results indicate that the phase field model can accurately simulate solid air growth and secondary branching under pure diffusion and forced convection conditions.During the competitive growth of polycrystalline nuclei,the solid air can fuse to form polycrystalline symbiont,and the secondary dendrites can increase the number of fusion sites.The forced convection can increase the risk of solid air in liquid hydrogen,with the highest oxygen content reaching 53.3％.The low-temperature visual experiment device can effectively observe the full-cycle growth process of solid air in liquid hydrogen.When the oxygen concentration in the simulated gas is 15％,the relative oxygen concentration of solid air can reach 33.8％,proving the oxygen enrichment characteristics of solid air.This research can support constructing a safe use system for liquid hydrogen.
liquid hydrogen propellantsolid airphase field methodvisualization
万方数据
维普
