ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of weather conditions during a large passenger aircraft natural icing evidence test flight
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Abstract:
Liquid Water Content (LWC), Median Volume Diameter (MVD), Outside Air Temperature (OAT) and other meteorological conditions are important meteorological factors affecting the intensity of aircraft icing, and are also the basic condition for measuring and evaluating whether the aircraft natural icing test flight meets the airworthiness standard. The meteorological conditions of a domestic large passenger aircraft"s natural icing test flight on January 22, 2022 were analyzed using multi-source meteorological data. The results show that the high-altitude weather background of this natural icing forensic test flight is a latitudinal fluctuating airflow, and the near-surface layer cooperates with the cold air inversion, forcing the southwest warm and humid airflow in the middle and lower layers of the troposphere to lift northward, and forming a wide range of non-precipitation layered cloud system. The height of the cloud top in the test area developed from 3.0 km to 4.6 km, and an inversion layer existed in 1.3-3.5 km, with the lowest temperature at the cloud top of -14 ℃, no precipitation in the cloud, and the radar basic reflectivity＜15 dBz. The ambient temperature of the two times of penetrating the cloud and the standby flight in the cloud for 45 min hovering flights was -10～-7 ℃, the relative humidity＞80%, and the scattering of water vapor flux＜-2.7×10-7 g/(s?hPa?cm2), providing ideal temperature and water vapor conditions for the natural icing test flights, and a weak updraft of -0.2 Pa?s-1 in the middle and upper part of the cloud layer, which contributes to the growth of the supercooled cloud droplets. The DMT sounding data show that the supercooled cloud is inhomogeneous both vertically and horizontally, and that supercooled cloud droplets predominate inside the cloud, and the average LWC value is 0.23-0.27 g?m-3, and the mean value of MVD is 15.82-15.93 μm. There are natural aircraft ice meteorological conditions in winter under the influence of the "inversion + inversion trough" weather system, which is conducive to carrying out aircraft natural icing forensic tests in Shaanxi.
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