悬浮冰晶粒子部分融化的数值模拟和实验研究

Numerical and experimental study on the melting of suspended ice crystals

  • 摘要: 对冰晶粒子在悬浮状态下的融化过程进行了数值模拟和实验研究,主要内容包括冰晶部分融化模型的建立、不同参数对冰晶融化的影响和冰晶粒子悬浮融化的实验研究。在冰晶部分融化模型方面,将冰晶的融化过程分为了固态阶段和冰水混合物阶段,并针对两个阶段分别建立了对应的理论模型;在不同参数对冰晶融化的影响方面,主要研究了空气温度、环境湿度、冰晶初始温度和冰晶初始直径对冰晶的融化率、冰晶质量损失率、冰晶融化速率和冰晶温度的影响规律,并经过正交试验分析得到了不同因素对冰晶融化的影响程度为:空气温度 > 冰晶初始直径 > 相对湿度 > 冰晶初始温度。在冰晶粒子悬浮融化实验方面,搭建了冰晶悬浮融化实验台,研究了冰晶的初始粒径大小、周围环境的温度和相对湿度对冰晶融化率和冰晶完全融化时间的影响,并与数值模拟结果进行了对比,其中完全融化时间的数据相对误差在25%以内,其中有83%介于 – 20%和20%之间,粒径数据的相对误差在5%以内。该研究有助于深入理解冰晶融化相变机理,可为飞机冰晶结冰研究提供理论和实验参考。

     

    Abstract: The melting process of suspended ice crystals has been studied both numerically and experimentally, with the aim of developing a melting model that incorporates the effects of various parameters on this process. Our findings indicate that the melting process of ice crystals can be divided into solid phase and ice-water mixture phase, whose corresponding theoretical models have been formulated. The influence of air temperature, environmental humidity, initial ice crystal temperature, and initial ice crystal diameter on ice crystals' melting rate, mass loss rate, and temperature was assessed. Through orthogonal test analysis, the degree of influence of various factors on ice crystal melting has been determined as follows: air temperature has the greatest impact, followed by initial ice crystal diameter, then relative humidity, and finally initial ice crystal temperature. An ice crystal suspension melting experiment platform was set up to further study the effects of the initial particle size of ice crystals, ambient temperature, and relative humidity on the melting rate and complete melting time. The comparison between numerical and experimental results indicates that the relative error of complete melting time is less than 25%, with 83% of these errors falling within the range of – 20% to 20%; the relative error of the particle size is within 5%. This study sheds light on the mechanism of ice crystal melting phase transition, offering valuable insights that can serve as both a theoretical and experimental reference for the research on aircraft ice crystal icing.

     

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