摘要
2018年3月17日、27日,国产某型直升机在新疆五家渠地区成功完成2架次自然结冰试飞。利用NCEP/NCAR的1°×1°再分析资料、机测液态水含量资料结合常规气象资料,对2次结冰天气过程的天气环流形势、动力热力特征、液态水含量进行分析。结果表明:17日在高空冷涡、地面冷锋前的环流形势下,试飞高度层位于冷暖平流交汇处,温度为0^-4℃,比湿值为3~3.5 g/kg,处于强水汽辐合中心,并伴有弱上升运动,Ic积冰指数为20~30,云中液态水含量波动较大,飞机挂架上形成<0.5 cm厚度的凇冰。27日在高空槽前和地面冷锋后的环流形势下,试飞高度层在弱冷平流中心附近,温度为0^-2℃,比湿值接近4.5 g/kg,处于弱水汽辐合中心边缘,伴有弱上升运动,Ic积冰指数为30~40,云中液态水含量稳定,飞机挂架上形成1~2 cm厚度的明冰。在气象保障中运用探空、云图、雷达、微波辐射计等资料有效预报了积冰区域及高度。
On March 17 and 27,2018,a domestic helicopter successfully completed two natural icing flight tests in the Wujiaqu area of Xinjiang.Based on the data of conventional observation and NCEP/NCAR 1°×1°reanalysis data,the weather circulation,dynamic and thermodynamic characteristics and liquid water content of two icing weather processes were analyzed.The results show that:on March 17,affected by high altitude cold vortex and cold front,the test flight layer is at the intersection of cold and warm advection,the temperature is between 0-4℃,and the specific humidity is 3-3.5 g/kg,in a strong water vapor convergence center,accompany with the weak upward movement,the Ic index is between 20 and 30,the liquid water content varies greatly,less than 0.5 cm smog ice formed on the pylon.On March 27,affected by high altitude trough and cold front,the test flight layer is near the weakly cold advection center,the temperature is between 0-2℃,and the specific humidity is close to 4.5 g/kg,at the edge of the weak water vapor convergence center,accompanied with the weak upward movement,the Ic index is between 30 and 40,the liquid water content is stable,and the 1-2 cm clear ice formed on the pylon.Through these studies,we demonstrate that adopting soundings,cloud maps,radar products,microwave radiometer products,and other data can predict icing area and altitude effectively in the weather forecast.
作者
王泽林
倪洪波
裴昌春
WANG Zelin;NI Hongbo;PEI Changchun(Chinese Flight Test Establishment,Xi'an 710089,China;Quanzhou Meteorological Bureau,Quanzhou 362000,China)
出处
《沙漠与绿洲气象》
2020年第2期68-74,共7页
Desert and Oasis Meteorology
关键词
直升机
自然结冰天气
积冰预报
干旱区
helicopter
natural icing weather
icing forecast
arid area
