### 结冰风洞中过冷大水滴云雾演化特性数值研究

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:2019-11-13 修回日期:2019-12-27 出版日期:2020-08-15 发布日期:2020-01-02
• 通讯作者: 郭向东 E-mail:easterkuo@163.com
• 基金资助:
国家"973"计划（2015CB755800）

### Numerical study of supercooled large droplet cloud evolution characteristics in icing wind tunnel

GUO Xiangdong1,2, LIU Qinglin2, LIU Senyun2, WANG Zixu2, LI Ming2

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:2019-11-13 Revised:2019-12-27 Online:2020-08-15 Published:2020-01-02
• Supported by:
National Basic Research Program of China (2015CB755800)

Abstract: In order to understand the Supercooled Large Droplet (SLD) cloud evolution characteristics in icing wind tunnels, a method based on Eulerian theory is developed to simulate SLD cloud flows coupling of momentum, mass and heat transfer. Using this method, the evolution of SLD cloud is investigated for the horizonal contraction configuration of the main section in a 3 m×2 m icing wind tunnel. The SLD cloud evolution characteristics, including cloud sinking and contraction, cloud momentum equilibrium and cloud thermal equilibrium, are analyzed. The effects of droplet deformation and breakup on the SLD mechanical equilibrium characteristic are explored. The states of cloud momentum equilibrium and thermal equilibrium in the main test section are evaluated. Results show that SLD droplets with diameter larger than 250 μm would experience significant deformation in the configuration. The increased droplet size could enhance the degree of deformation. Particularly at the test section velocity of 160 m/s, SLD droplets with the diameter larger than 750 μm would break up. Then the effects of droplet deformation and breakup could increase the rates of droplet acceleration and temperature reduction, so that the SLD droplets would approach the momentum and thermal equilibrium states. The SLD cloud with the maximum diameter of 1000 μm shows size and concentration stratification, momentum stratification and thermal stratification at the configuration outlet. In the SLD cloud, the small droplets with diameter smaller than 100 μm would reach the equilibrium states with higher speed, lower temperature and constant condensation. However, large SLD droplets with diameter larger than 500 μm would deviate from equilibrium states significantly with lower speed, higher temperature and constant evaporation. Increased test section velocity could reduce the degree of SLD cloud concentration stratification, but enhance the degree of momentum and thermal stratification. In particular, in the condition with the test section of 160 m/s, the SLD cloud will be uniform in the central area of the outlet (almost -0.75 m < Y < 0.75 m and -0.5 m < Z < 0.5 m), but the maximum velocity difference and temperature difference compared with the equilibrium states are higher than 18 m/s and 20 ℃, respectively.