制冷技术2024，Vol.44Issue(2)：11-17,37,8.DOI:10.3969/j.issn.2095-4468.2024.02.102
基于格子玻尔兹曼-元胞自动机模型的固空凝固相变模拟
Simulation of Air Solidification Phase Transformation Based on Lattice Boltzmann and Cellular Automaton Model
摘要
Abstract
In order to study the solidification process of solid-air in liquid hydrogen in the flow field,the air is regarded as a nitrogen-oxygen mixture and the Lattice Boltzmann Method-Cellular Automaton(LBM-CA)method is used to simulate the dendrite growth of solid-air crystals under forced convection and the distribution of nitrogen and oxygen in the crystals.The results show that the influence of the flow field on the dendrite morphology is manifested in the imbalance of the growth rate of the dendrites on the upstream side and the downstream side.The upstream latent heat of solidification and the rejected solutes accumulate in the downstream with the flow field,which leads to the promotion of dendritic growth on the upstream and the suppression on the downstream.The growth asymmetry is more obvious and the oxygen concentration in the oxygen-rich zone increases with the increase of the flow velocity.When the flow velocity increases to 0.05 m/s,the concentration in the oxygen-rich zone reaches 23.48%which results the explosion risk of the liquid hydrogen system increases.As the subcooling increases,the asymmetry of the solid crystal is weakened.The growth of the central grain is significantly inhibited when multiple crystal grains are crystallized and the peak oxygen concentration and the area of the oxygen-enriched zone are significantly increased compared with single crystal grain growth.关键词
格子玻尔兹曼-元胞自动机/固态空气/液氢/氧浓度分布Key words
Lattice Boltzmann method-cellular automaton/Solid air/Liquid hydrogen/Oxygen concentration分类
通用工业技术引用本文复制引用
戴闻骁,郑晓红,梁文清,钱华,雷刚,疏志勇..基于格子玻尔兹曼-元胞自动机模型的固空凝固相变模拟[J].制冷技术,2024,44(2):11-17,37,8.基金项目
国家自然科学基金(No.51676213),国家重点实验室基金课题(No.SKLTSCP1713). （No.51676213）
