一次飞机积冰条件下的云粒子结构分析

为了研究飞机积冰的一般规律，增强飞行安全保障能力，利用2003年9月19日甘肃省人工增雨飞机空中观测资料和机载PMS粒子探测系统采集数据，分析了出现飞机积冰的气象条件和云层微物理结构。PMS探测到云层中云粒子浓度在0．05-5．91个/cm3，均值为0．93个／cm3；云中含水量均值为0．0043g／m3，最大值为0．0233g／m3；在6200米以上，云中粒子浓度、含水量以及平均浓度直径都较大。分析结果表明：飞机出现较强积冰时的温度低于-5℃；积冰出现在粒子总浓度和含水量较大区域，且雨滴浓度和平均直径的增大对积冰的出现具有重要作用；大粒子对发生积冰贡献值较大。

The Cloud Particle Structure of an Aircrafticing

In this paper, by means of artificial rain aircraft and airborne sounding system, data in September 19, 2003 was acquired. To study the rule of aircraft icing which can be helpful to the aircraft safety guarantee, cloud micro- physical structure and meteorological conditions in the flight are analyzed. Cloud particle concentration is between 0. 05 and 5.91 per cm3 and the mean value is 0.93 per cm3. The mean cloud water content is 0.0043g/m3 and the max value is 0.0233g/m3. Above 6200m, the cloud particle concentration, liquid water content, and mean particle diam- eter are higher. Three major results were given in this study： aircraft icing is seriously when the circumstance tem- perature is lower than - 5℃ ; Ice accretion appears in high total particle concentration and water content areas. A continuous increase in concentration and mean diameter of rain drop played an important role in the accretion. Contri- bution of large particles was the most significant element in this process.