微小冰晶粒子融化特性可视化实验

doi:10.7527/S1000-6893.2023.29301

Abstract

Abstract:

The melting characteristics of ice crystals in complex airflow are crucial to the aircraft engine anti-icing technology. Visual experiments on the melting behavior of ice crystal particles play a vital role in exploring engine icing mechanisms and enhancing aircraft safety. In this study， we designed and established a visualization experimental system to examine the melting process of suspended minuscule ice crystals. An ice-water phase interface recognition method was proposed based on OpenCV， and a program to estimate the ice crystal melting rate was developed based on the equivalent model method. To carry out the experimental investigation of ice crystal melting characteristics， the melting process of spherical ice crystal particles with the volume ranging from 0.4 μL to 1.4 μL was conducted as study object in a closed chamber with the wall temperatures ranging from 5 °C to 35 °C. The effects of temperature and particle size on the melting rate of ice crystal were investigated， and an experimental correlation equation based on the collected experimental data was derived The results show that the ice crystal melting rate follows a linear relationship with time. The influence of enAI particle size on the melting rate is more significant than that of temperature. As temperature increases， the ice crystal melting rate first increases rapidly and then becomes gentle. When the temperature remains constant， the ice crystal melting rate is inversely proportional to the particle size. When the ice crystal melting rate is low， the ice core is prone to ‘flipping’， causing a sudden change in the measured melting rate of the ice crystal. This study contributes to a deeper understanding of the phase transition and heat transfer mechanisms of ice crystals and provide a theoretical basis for optimizing mixed-phase icing models under complex airflow environments within aircraft engines.

Key words: ice crystal melting, image recognition, visualization experiment, melting characteristics, melting rate

CLC Number:

V233.94

Zhen WEI, Xiufang LIU, Fuhao ZHONG, Jiajun CHEN, Qingshuo MIAO, Yu HOU. Visual experimental investigation on melting characteristics of minuscule ice crystal particles[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(S2): 729301-729301.

Figures/Tables 12

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Visual experimental investigation on melting characteristics of minuscule ice crystal particles

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