What is the use of spewing white smoke from the back of the plane, what is the white smoke from the

This is called an airplane "wake cloud". This phenomenon is commonly known as "airplane smoke". Aircraft wake clouds do not exist for long and usually disappear quickly, but when conditions are favorable, they can exist for more than 1 hour and can expand into a relatively wide cloud cover.

Not all aircraft can create such wake clouds, and wake clouds can only be produced when the jet is flying in an air layer below --20, when the air humidity is close to or saturated, and the atmosphere is relatively stable. The principle of wake cloud formation is that when the jet plane flies at a high altitude with a relatively cold and high water vapor content, the exhaust gas ejected from the tail of the aircraft becomes an "aerosol catalyst" for artificial cloud formation, so that the low temperature and high humidity air condenses into cloud bands.

Another process in which wake clouds are generated is when an aircraft is flying in near-saturated air, and the air near the tips of the propellers and wings is adiabatic and cooled by dynamic depressurization, but this is a rare occurrence.

There is also a phenomenon similar to the wake cloud, which is called "evaporation wake". It is the exhaust gas of the aircraft flying in the thin clouds at high altitude to the heating effect of the ambient air is greater than the humidification effect, the mixed air due to the increase in temperature, the relative humidity decreases, the result is that the original cloud layer evaporates, forming a long cloudless blue gap in the white cloud, which is the evaporation wake. When the airplane is performing an air show, it will consciously circle in the air, so it pulls out a ring-shaped wake cloud at the tail, which is very beautiful.

Sometimes a dozen or two dozen planes fly in a line, forming a dense wake cloud, which is spectacular. Usually, when aircraft are on military missions, in order not to expose themselves early, they must follow the weather forecast and avoid entering clouds that can form wake clouds. On the contrary, they sometimes use the plane trail cloud to confuse the other party and make themselves flee quickly.

In countries with advanced aviation industries, such as North America and Western Europe, wake clouds have had a direct impact on high cloud cover. Some scientists believe that wake clouds are artificial cirrus clouds, and a large number of wake clouds will cause an unconscious effect of artificial weather modification.

The white smoke of the aircraft seen on a sunny day is the wake cloud of the aircraft, which is a natural phenomenon unique to jet aircraft.

Only when a jet is flying in an air layer below -20 and the air humidity is close to or saturated can tail smoke, known as wake clouds, be produced.

The principle of wake cloud formation is that when the jet aircraft flies at a high altitude with a relatively cold and large water vapor content, the hot air ejected from the tail of the aircraft condenses in the low temperature and high humidity air to form cloud bands. Another process that produces wake clouds is:

It is a rare occurrence for aircraft to fly in near-saturated air, where the air near the tips of the propellers and wings is adiabatic and cooled by dynamic depressurization.

Generally speaking, at an altitude of 10,000 meters to 7,000 meters, the aircraft is prone to the formation of wake clouds, beyond this range, the aircraft will not produce the phenomenon of "pulling smoke".

During the air show, the aircraft will hang a smoke generator or add a certain chemical component to the fuel to produce smoke to mark the route or flight path to enhance the viewing experience.

The white smoke produced in general flight is formed by the condensation of moisture in the exhaust gas produced by the engine in the air, which is related to fuel, air humidity, temperature, etc.

The white smoke behind the plane is the exhaust produced by the jet engine, also known as the aircraft wake, commonly known as the aircraft smoke.

In general, the long "white smoke" behind a jet is due to the formation of water and carbon dioxide after the fuel is burned inside the engine. Since the temperature at high altitude is very low, it condenses into a large number of small water droplets, which are suspended in the air and appear as a white smoke from a distance.

Not all aircraft are able to create such wake clouds, and wake clouds can only be produced when jet aircraft are flying in the atmosphere below -20 degrees Celsius, when the air humidity is close to or saturated, and when the atmosphere is relatively stable. Moreover, the wake cloud can be divided into exhaust gas wake, aerodynamic wakeing and convective wake, and the exhaust gas wakeing can be further divided into exhaust gas condensation trail and exhaust gas evaporation trail.

Notes:

Most of the common aircraft wake traces are exhaust gas condensation traces, which are water vapor condensation caused by the mixing of the exhaust gases discharged by the aircraft with the ambient air, which is completely different from the smoke released in the air show to increase the effect. The layer of air that can produce aircraft wake is called the aircraft wake layer, which is mostly one layer, and occasionally several layers appear at the same time; The altitude at which it occurs mainly depends on the meteorological conditions such as temperature and humidity in the atmosphere, and is also related to the type of aircraft and flight status. Exhaust wakes mostly occur at high altitudes when the temperature is below or above meters.

Aircraft wake has no effect on aircraft performance, but it will reveal the aircraft's location, number of aircraft, and whereabouts, and both sides are careful to use or avoid it in air combat.

It is a visible wake formed by concentrated water vapor expelled from an aircraft engine. As the exhaust fumes from the hot engine are cooled in the air, they can condense to form a cloud of tiny water droplets. If the air temperature is low enough, the airplane cloud may also be made up of tiny ice crystals.

The wingtip vortex dragged from the tip of the wing or flaps is sometimes partially visible due to condensation of water vapor in the core of the vortex. Each whirlpool is a large swirling expanse of air, and the air pressure in the center of the whirlpool is very low. This wingtip vortex has no correlation with the exhaust fumes from the engine, and the wingtip vortex is sometimes referred to as a steam wake.

There are two principles of aircraft cloud formation:

One is that when the jet aircraft flies at a high altitude with a relatively cold and high water vapor content, the exhaust gas ejected from the tail of the aircraft becomes an "aerosol catalyst" for artificial cloud formation, so that the low temperature and high humidity air condenses into cloud bands.

The other is that the aircraft is flying in near-saturated air, and the air near the tips of the propellers and wings is adiabatic and adiabatic due to dynamic depressurization, but this is relatively rare.

Why is there a "white smoke" when the plane passes by? What exactly is it? Few people know.

There are several cases of white smoke from the back of an airplane, and oil draining is one of them.

1. The color smoke of the performance machine is artificially dispensed, and there is a special smoke pulling equipment to spray the smoke pulling agent into the nozzle and discharge;

2. The white smoke pulled by high-altitude flight is the water vapor in the engine exhaust.

As a result of condensation, because of the low temperature at high altitude, the aircraft fuel is fossil hydrocarbon kerosene, and the combustion products have a large amount of water vapor, and this condensation process is similar to the formation of aerial clouds, which are supersaturated precipitation;

3. There is also a thought of the wheel of the situation is to release the oil, the plane returns to the field in advance for some reason, when the total weight of the aircraft is greater than the normal landing weight, the excess fuel will be released, and the smoke will also be formed, but the smoke is very short, because the kerosene will soon volatilize after being sprinkled into the air.

Reasons for aircraft refueling: 1. Because the maximum take-off weight of the aircraft is much greater than the maximum landing weight, if the aircraft requires immediate landing due to failure after takeoff, then the landing weight at this time will exceed the maximum landing weight of the aircraft. In case of forced landing, landing gear.

There is a danger of breaking. In order to reduce the weight of the aircraft and achieve the weight to land safely, it is necessary to release fuel in the air.

2. If the aircraft requires a forced landing due to unexpected circumstances, especially when the landing gear cannot be lowered, if there is a large amount of fuel left in the aircraft, it is likely to be ignited by friction, high temperature caused by collision, and sparks during landing, and a high-speed fire will occur, and even lead to the aircraft. In this way, it is also necessary to carry out air oil release before the forced landing. However, although the sky is large, the oil can not be released indiscriminately, and the oil cannot be released in the sky above the city, airport, forest and near the ground at low altitudes, and the oil release site is generally selected in the sky above the ocean, mountains and wastelands.

It is a special cloud system formed by the condensation of water vapor after the exhaust gas discharged by the aircraft is mixed with the surrounding air, which is called the aircraft wake in the aviation flight community and aviation meteorology, also called "wake cloud" and "aircraft tail cloud", which is commonly known as "aircraft smoke".

Aircraft cloud, a long white smoke-like condensation that sometimes appears behind the tail of an aircraft during flight. It is commonly known as airplane smoke. The common aircraft wake is mostly exhaust gas condensation, which is the phenomenon of water vapor condensation caused by the mixture of the exhaust gas discharged by the aircraft and the air carried by the environmental socks, which is completely different from the smoke released in the air show to increase the effect.

Aircraft wake

The aircraft consumes a large amount of fuel when flying, and the water vapor and part of the heat produced by the Ming Dynasty are discharged out of the aircraft with the exhaust gas, enter the atmosphere, and quickly mix with the surrounding ambient air to form condensation traces. 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 mixture 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 40).

The above content reference:Encyclopedia - Aircraft wake

The white smoke from the back of the aircraft is the concentrated water vapor emitted from the aircraft engine.

The reason for this is that airplanes need a lot of fuel to fly, which produces water vapor and heat, which are discharged to the atmosphere.

, when the environment is low, it mixes with the surrounding air to form a condensation trail.

The plane pulled out the "white line."

There is thickness, thickness, too. Its thickness is generally 1 to 2 kilometers on average. The depth of the "white line" will also change, and the length and concentration of the "white line" formed at different heights are also different.

Generally, at the bottom of it is a shorter and lighter "white line", which gradually lengthens and thickens upwards, and after reaching a certain height, it becomes an intermittent and light-toned "white line" again.

Flying is a very convenient means of transportation, and it is also the safest means of transportation. But we often see it in **, and there may be white smoke behind the plane. Many people think that this is real white smoke, but it is not.

The white smoke behind the plane is not really smoke, it is the exhaust gas formed after the warm air inside the plane comes into contact with the cold air in the air, which is actually the same as our winter gas. The altitude of the flight is relatively high, so the temperature will be very low, but the gas in the plane is warm, so after contact with the cold air, white smoke will be formed, which is a very normal situation.