That place is above the white clouds......

"Track cloud" is also known as "aircraft wake", "aircraft wake cloud", "aircraft tail cloud" or "aircraft smoke" (not the smoke of the air show), which is a unique phenomenon produced by jet aircraft when flying at high altitude. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

It is not uncommon to see jets flying high in clear skies, with one or more long streaks of "white smoke" behind the fuselage. In fact, this is not the smoke emitted by the jet aircraft, but the exhaust gas emitted by the aircraft is mixed with the surrounding air, and the water vapor condenses into a special cloud system, which is called the aircraft wake in the aviation flight community and aviation meteorology, which is commonly known as "aircraft smoke".

According to the cause, aircraft wake can be divided into exhaust gas trail, aerodynamic trail and convective trail. Exhaust gas trails can be divided into exhaust gas condensation trails and exhaust gas evaporation trails. Among them, the most common is the exhaust gas condensation trace, which is the aircraft condensation trace that this article focuses on.

When the aircraft flies, it consumes a large amount of fuel, and the water vapor and part of the heat generated are discharged out of the aircraft with the exhaust gas, enter the atmosphere, and quickly mix with the surrounding air to form contrails. The process of its formation is different from the dew, frost and clouds in the air that people commonly see on the ground. The exhaust gases emitted by the aircraft at high altitudes are mixed with the ambient air, and the saturation of this mixture depends on the net effect of both heat and water vapour increases. When the humidification effect prevails and exceeds a given threshold, contrails are formed; When the heat gain effect is dominant, no condensation occurs and no condensation trails appear. Since the heating and humidification effects of the exhaust gas are certain, whether there will be condensation in the mixed gas will depend on the temperature, humidity and atmospheric pressure of the ambient air itself. In short, high ambient air temperatures are not conducive to the formation of contrails, and aircraft contrails are only possible when the ambient temperature is quite low (usually below -40C). According to the relevant data, when the aircraft wake appears, the air temperature is mostly -41C~-60C, accounting for about 86% of the aircraft wake, if the air temperature is higher than -40C or lower than -60C, the aircraft wake phenomenon is generally rare.

The seasonal variation in the height of the aircraft's wake is not obvious, and in general, it occurs more often in the winter half of the year than in the summer half. The average thickness of the wake layer is 1~2 km, and the lower limit height is the lowest in winter and the highest in summer. In thicker aircraft contrails, the length and concentration of wakes formed at different altitudes are also different. Usually at the bottom of it is a short and light-concentrated trail, which gradually lengthens and thickens upwards, and when it reaches a certain height, it becomes an intermittent and light-toned trail again.

A special cloud formed by the exhaust gases from the engines of the aircraft during flight mixed with the surrounding air. It generally occurs in the air layer with air temperatures below -40 degrees Celsius and suitable humidity conditions. The wake of the aircraft has no effect on the flight, but the whereabouts are exposed, which has a certain effect on the combat operations of the aviation.

Track clouds belong to one of the man-made meteorological landscapes, and sometimes there are white track clouds in the blue sky, which leads people to reverie and has a certain sense of romance. It is reflected in many poems, essays, songs, or film and television works.

The trail cloud is just like the moon star sings: "We watch, the disappearing trail cloud." Gone in the light. We still parted sadly and said goodbye. The place of longing is still far away. I only hide my blessings in my eyes. Kids on the railroad tracks on a summer day. Put the hope of taking off in your hands. We chased after the vanishing clouds. Everything is exactly the same as the day it flew over this hill. We have persistent beliefs. I will always be as strong as the sea. ”

In the endless trail clouds, there was a long trail cloud that became like a spirit, rushing towards us like a living organism.

Wind: "This ...... What is this?"

Yin Shan: "What's there, just like you see." Quick, get ready!"

Fog: "It's ......"

Shan Liankong: "You can ask such an idiotic question." ”

Xi Yue: "It's clearly a monster!" ”

Ever since a butterfly was printed on the back of our neck, our clothes have changed completely, as if we were being forced to wear a new dress. Although the shape is the same as the clothes we are used to, the color is almost a dazzling white. In addition to a small butterfly on each side of the neckline, there is also a huge butterfly dyed on the back. Needless to say, I also know that this is the uniform of the butterfly family.

"There's trouble."

Feng squatted on the clouds and slowly stood up, slowly turned his head, and saw a lifeform less than ten zhang away from him, and the clouds were flowing all over the ground, with green eyes flashing, looking at the wind. Not only this lifeform tracking cloud, but also a tracking cloud life form No. 2 walking towards the wind and others with light steps in the high sky. There were no less than thirty blackened track clouds among the surrounding black thunderclouds, revealing a greedy fierce light, surrounding Feng and the others.

Wind: "Do you like to eat roasted Traceway Cloud Life Body Meat?" ”

Yin Shan: "It's all this time, are you still in the mood to joke!" ”

Be careful with the wind, most of the tracking cloud lifeforms in the thunderclouds are 20,000 or 30,000 levels, and the low-level tracking cloud lifeforms that are not strong in strength will not have the slightest fear if they go head-to-head, but he is now facing more than 30 tracking cloud lifeform monsters, if they attack in groups, they will only have to escape.

Yin Shan also sensed the imminent danger at this time, stood up and looked at the Track Cloud 2 that was slowly walking on the opposite side, and suddenly showed a fierce expression, and said angrily: "You dare to disturb us, I want you to look good." ”

"Tu's Fist" Yin Shan snorted sullenly, stepped on the cloud with one foot, and the whole body suddenly volleyed into the air, as if stepping on the clouds, soft and elegant, and like a fairy shuttling in the clouds, extremely wonderful.

The wind has no time to stop it, there are dozens of tracking clouds around here, and attacking without authorization is likely to attract a group attack by tracking cloud lifeforms, and countermeasures must be discussed, otherwise it will be surrounded by deep encirclement, and it will be difficult to escape when the time comes.

Seeing Yin Shan stepping out of the clouds, Feng was secretly worried in his heart, and rushed up with Qigong......

But as soon as Qin Tian took a step, he saw Yin Shan ..............................

(From now on, silver will only be wonderful in the end, I wish all book friends a happy new year, all wishes come true, and all the best.) Ask for collections, ask for recommendation votes. Next week, Mengmeng will write the content more exciting and exciting, more exciting than all the clouds in front of it............ ）

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