Joke Collection Website - Cold jokes - What's the joke behind Lao Yi flying to America to eat garbage?
What's the joke behind Lao Yi flying to America to eat garbage?
The trace left by an airplane is a special cloud system formed by the condensation of water vapor after the exhaust gas discharged by the airplane is mixed with the surrounding air. In aviation flight and aviation meteorology, it is called aircraft wake, which is also commonly known as "aircraft smoke". According to the formation reasons, aircraft wake can be divided into exhaust wake, aerodynamic wake and convection wake. Exhaust wake can be divided into exhaust condensation wake and exhaust evaporation wake. Among the above wakes, the most common one is the exhaust condensation wake. Aircraft consumes a lot of fuel when flying, and the generated water vapor and some heat are discharged from the aircraft with the exhaust gas, enter the atmosphere, and quickly mix with the surrounding air to form a condensed tail flow. Its formation process is different from dew on the ground, frost and clouds in the air. The exhaust gas from high-altitude aircraft is mixed with ambient air, and the saturation of this mixed gas depends on the net effect of heat and water vapor increment. When the humidification effect is dominant and exceeds the given critical value, the condensation trail will be formed; When the thermal effect is dominant, condensation will not occur and there will be no condensation traces. Because the heating and humidification of waste gas is certain, whether condensation will occur in this mixed gas depends on the temperature, humidity and atmospheric pressure of the ambient air itself. In short, when the ambient air temperature is high, it is not conducive to the formation of condensation trails. Only when the ambient temperature is quite low (usually below -40℃) can the condensation wake of the aircraft appear. According to relevant data, at present, the temperature of aircraft tail outflow is mostly -4 1℃ ~-60℃, accounting for about 86% of aircraft wake. If the temperature is higher than -40℃ or lower than -60℃, the aircraft wake rarely appears. The aerodynamic wake is a cloud knot formed by the mixing of the spiral vortex on the plane and the air with high humidity at that time, and its length and existence time are short. Convection wake refers to the smoke knot formed by the expansion and cooling of the exhaust gas discharged from the aircraft to the condensation height, which usually forms at the height of several hundred meters to several thousand meters at the rear of the aircraft and exists for a long time. The seasonal variation of aircraft wake is not obvious. Generally speaking, winter appears more often than summer. The average thickness of wake layer is 1 ~ 2km, and the lower limit height is the lowest in winter and the highest in summer. In the thick tail flow of aircraft condensation, the length and concentration of wake formed at different heights are also different. Usually, the tail with short length and light concentration flows out at its bottom, gradually becomes longer and thicker upward, and becomes an intermittent light-colored wake when it reaches a certain height.
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