基于水滴收集特征的SLD探头外形参数化设计与仿真研究

Parametric Design and Simulation of SLD Probe Based on Water Droplet Impingement Characteristics

面对过冷大水滴(Supercooled large droplet,SLD)结冰环境,行之有效的结冰探测手段是实施规避策略、尽快脱离SLD结冰环境的先决条件。针对一种面向SLD环境探测需求的双碰撞面探头,考虑基于SLD动力学模型,模拟分析探头水滴收集特征进行探头外形参数化设计研究,研究影响探头区分SLD环境的关键几何参数,从而为探头外形设计提供参考依据。对选定的探头外形仿真计算结果表明,在常规水滴条件下,结冰主要发生在探测器的第一碰撞面,第二碰撞面上的结冰厚度很小,与第一碰撞面之间存在明显差异;而在SLD条件下,冰层在第一及第二碰撞面上均有累积。不同直径的水滴撞击到探头不同位置,形成累积特征迥异的结冰形态,验证了探头外形参数化设计方法应用于SLD环境探测的有效性。

Facing supercooled large droplet(SLD)environment,an effective ice detection method is a prerequisite for implementing the avoidance strategy and leaving the icing environment of SLD as soon as possible.Based on the dynamics model of SLD,the water droplet collection characteristics of the double impact surface probe for SLD environment detection requirements are simulated and analyzed to study the parametric design of the probe shape.The key geometric parameters that affect the distinction of SLD environment are clarified,which provides a theoretical basis for the probe shape design.Typical detector shapes are selected for simulation calculation.The simulation calculation results show that under the normal water drop condition,the icing mainly occurs on the first windward side of the detector,and the icing thickness on the second windward side is very small,which is obviously different from that on the first windward side.Under the condition of SLD,the ice layer accumulates on the first and the second windward surfaces.The water droplets with different diameters can hit the different positions on the probe and form different ice accumulation characteristics.The results verify the effectiveness of the parametric design method of the probe shape for SLD environment detection.