导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (2): 520703-520709.doi: 10.7527/S1000-6893.2016.0309

• Special Column of Aviation Guided Weapons • Previous Articles     Next Articles

Freezing characteristics of supercooled water droplet in consideration of non-equilibrium effect

XIAO Guangming, DU Yanxia, WANG Qiao, GUO Long, WANG Mao   

  1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2016-08-24 Revised:2016-11-23 Online:2017-02-15 Published:2016-12-05
  • Supported by:

    National Natural Science Foundation of China (51308531, 11672322); National Basic Research Program of China (2015CB755800)

Abstract:

Non-equilibrium effect is an important phenomenon in freezing of supercooled water droplet in aircraft icing process. Based on the enthalpy-porosity model, a numerical prediction method for freezing of supercooled water droplet is developed. The experimental system for droplet freezing is built up and several experiments are performed to validate the numerical method proposed. The results indicate that the developed model is valid and can be used to predict the freezing characteristics of supercooled water droplet. Based on the improved freezing model, the influence of the degree of supercooled and cooling conditions on the characteristics of supercooled droplet are analyzed. When the degree of supercooled is decreased to zero, the developed model degenerates to the traditional model. The greater or smaller the degree of supercooled or smaller the droplets is, the relatively higher freezing rate is. In consideration of the effect of non-equilibrium conditions, the freezing and moving rate of interface is higher than the traditional model. Related research can provide important reference for improving icing thermodynamic model and refining the prediction method for icing accretion.

Key words: supercooled water droplet, icing, non-equilibrium effect, solidification, improved model

CLC Number: