航空燃料水分低温结冰相场数值模拟

Numerical simulation of icing in low-temperature aviation fuel using phase field method

  • 摘要: 为研究不同工况下航空燃油水分低温冰晶的生长特性,依据相场理论、传热传质方程和能量守恒方程,建立了航空燃油低温结冰模型,分析了不同时刻水浓度、各向异性强度等参数对冰晶生长特性的影响。结果表明:燃料水浓度越大,固相率和枝晶直径也越大;随着各向异性强度的增加,冰晶直径呈上升趋势,最后在恒定值附近小幅波动;环境对冰晶的形态有显著的影响,当冰晶环境从空气变为燃料时,冰晶的侧枝不再生长,而冰晶的尺寸相应减小。随着时间的增加,多晶的固相率持续增加,从t = 4时的0.1584增长到t = 12 时的0.2964,增长了约87.1%;过冷度越大,固相率增长速度减缓得越快。该研究成果可为燃料环境下冰晶生长机理提供参考,并为工程上的防除冰方法提供借鉴。

     

    Abstract: To study the growth characteristics of low-temperature ice crystals in aviation fuel moisture under different working conditions, a low-temperature icing model of aviation fuel was established based on the phase field theory, the heat and mass transfer equation and the energy conservation equation. The effects of water concentration, anisotropic strength and other parameters on the growth characteristics of ice crystals at different time instances were analyzed. The results show that, when the fuel water concentration is larger, the solid phase rate and dendrite diameter are also larger. With the increase of anisotropy strength, the diameter of ice crystals tends to increase, and eventually fluctuates slightly near a constant value. The environment has a significant effect on the morphology of ice crystals. When the ice crystal environment changes from air to fuel, the side branches of ice crystals no longer grow, while the size of ice crystals decreases accordingly. The solid phase rate of poly-crystals continues to increase with time, growing from 0.1584 at t = 4 to 0.2964 at t = 12, reaching an increasement of about 87.1%. Meanwhile, the larger the degree of subcooling, the faster the growth of the solid phase rate slows down. This research can provide references for the ice crystal growth mechanism in fuel environments and offer insights for engineering anti-icing and de-icing methods.

     

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