Traditional Culture Encyclopedia - Weather forecast - How did aircraft cloud come into being?
How did aircraft cloud come into being?
Aircraft wake not all aircraft can produce this kind of wake cloud. Only when the jet plane flies in the air layer below -20℃, the air humidity is close to or saturated, and the atmosphere is relatively stable, can it produce wake clouds. The principle of wake cloud formation is that when a jet plane flies at a rather cold altitude with high water vapor content, the exhaust gas discharged from the tail of the plane becomes an "aerosol catalyst" for artificial cloud formation, which condenses the low temperature and high humidity air into cloud bands. Another process of generating wake clouds is that the aircraft flies in nearly saturated air, and the air near the propeller and the top of the wing is adiabatically cooled due to dynamic depressurization, but this situation is rare. Another phenomenon similar to the wake cloud is the "evaporation wake". That is, the exhaust gas emitted by airplanes flying in thin clouds at high altitude heats the surrounding air more than humidifies it. With the increase of mixed air temperature, the relative humidity decreases. As a result, the original cloud evaporated, forming a long cloudless blue gap in the white clouds, which is the evaporation trace. When the plane is performing an air show, it will consciously hover in the air, so it will pull out a round wake cloud at the tail, which is very beautiful. Sometimes a dozen or twenty planes fly in a row, forming a dense wake cloud, which is very spectacular. Under normal circumstances, in order not to expose itself prematurely, aircraft should avoid entering the clouds that can form wake clouds according to the weather forecast when performing military tasks. On the contrary, sometimes aircraft wake clouds are used to confuse each other and make them flee quickly. In North America and Western European countries with developed aviation industry, the wake cloud has a direct impact on the coverage of high clouds. Some scientists believe that the tail cloud is an artificial cirrus cloud, and a large number of tail clouds will cause an unconscious weather-influencing effect.
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