### 结冰风洞中液滴相变效应数值模拟

1. 1. 中国空气动力研究与发展中心 空气动力学国家重点实验室, 绵阳 621000;
2. 中国空气动力研究与发展中心 飞行器结冰与防除冰重点实验室, 绵阳 621000
• 收稿日期:2017-07-06 修回日期:2017-09-21 出版日期:2018-03-15 发布日期:2017-09-21
• 通讯作者: 郭向东,E-mail:easterkuo@163.com E-mail:easterkuo@163.com
• 基金资助:
国家"973"计划（2015CB755800）

### Numerical investigation of phase transition effects of droplet in icing wind tunnel

GUO Xiangdong1,2, WANG Zixu2, LI Ming2, LIU Bei2

1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. Key Laboratory of Aircraft Icing and Anti/De-Icing, China Aerodynamics Research and Development Center, Mianyang 621000, China
• Received:2017-07-06 Revised:2017-09-21 Online:2018-03-15 Published:2017-09-21
• Supported by:
National Basic Research Program of China (2015CB755800)

Abstract: To understand the phase transition effects of the droplet in an icing wind tunnel, a method based on the Euler theory is developed to simulate mass and heat transfer of coupling of momentum of gas-droplet mixed flows. Using this method, the droplet phase transition effects on the process of the droplet heat transfer are explored for the main test section configuration of a 3 m×2 m icing wind tunnel. Parametric studies are then conducted to evaluate the supercooling state of the droplet in the test section. Results show that the droplets experience firstly evaporation and then condensation in the configuration. The evaporation effects enhance the trend of decrease in the droplet temperature in the quasi-1D stage, and then make the droplet temperature close to the wet-bulb temperature. However, the condensation effects inhibit the trend of decrease in the droplet temperature in the 3D contraction stage, so that the temperature difference between droplet and gas in the test section is increased. As a result, the droplet phase transition has an effect on the supercooling state of the droplet in the test section. In addition, the increased initial relative humidity and test section velocity reduce the evaporation effects, but enhance the condensation effects. Therefore, the effects of relative humidity and test section velocity on the supercooling state of the droplet are enhanced. On the contrary, effects of both evaporation and condensation are reduced, as the initial sizes of the droplet increases. Therefore, the effect of the droplet size on the droplet supercooling is reduced. In typical test conditions, small droplets (the diameter is bigger than 40 μm and smaller than 100 μm) in the center of the test section deviate from the supercooling state (the temperature difference between droplet and gas is higher than 3℃) at the high velocity (the velocity is higher than 164 m/s).