This article investigates liquid water content (LWC) and its uniformity in supercooled aerosol clouds produced in a low-speed horizontal icing wind tunnel used for simulating atmospheric icing. The dependence of LWC obtained at mid-height of the tunnel test section on thermodynamic parameters of the air stream and on dynamic parameters applied to the nozzle system is determined empirically for two types of nozzles. The investigation reveals that LWC increases with air velocity, reaches a maximum at a low airspeed (below 30 m/s), and decreases as was observed at high airspeeds used for modeling aircraft icing (up to 160 m/s) only after passing this maximum. This complex behavior is explained by the concurrence of two processes: the vertical separation of droplets of different size due to the effect of gravity, and the vertical and transverse shrinkage of the aerosol cloud co-occurring with its streamwise expansion.
展开▼
机译：本文研究了用于模拟大气结冰的低速水平结冰风洞中产生的过冷气溶胶云中的液态水含量（LWC）及其均匀性。对于两种类型的喷嘴，根据经验确定在隧道测试段的中部高度获得的LWC取决于气流的热力学参数和应用于喷嘴系统的动力学参数。研究表明，LWC随着空气速度的增加而增加，在低空速时（低于30 m / s）达到最大值，而在用于模拟飞机结冰的高空速时（最高至160 m / s），LWC随其降低而降低。最大值。这种复杂的行为可以通过两个过程的同时进行来解释：由于重力的作用，不同大小的液滴在垂直方向上分离，而气溶胶云在其沿流方向的膨胀中同时发生纵向和横向收缩。
展开▼
