How does an airplane fly? What is the principle of an airplane and why can it fly?

The reason why the plane can fly into the sky is mainly because of the solution of the following three problems:

power problems in order for the aircraft to have sufficient flight speed;

lift issues to generate enough lift to hold the aircraft up;

Maneuvering problems to change the attitude of the aircraft as needed to enable the aircraft to rise, turn, descend, .......

To solve the first problem, it was the installation of engines that would allow the aircraft to move forward and reach sufficient speed;

To solve the second problem, there are wings or rotors (***). The majority of the aircraft's lift is generated by the wings: the air flows to the leading edge of the wing, divides into two streams, the upper and lower airflows, which flow along the upper and lower surfaces of the wing, respectively, and rejoin at the trailing edge of the wing and flow backwards.

The upper surface of the wing is more convex, the flow rate increases, and the pressure decreases. On the lower surface of the wing, the air flow is blocked, the flow rate slows down, and the pressure increases, so that the pressure difference between the upper and lower surfaces of the wing appears, and the sum of the pressure difference perpendicular to the relative direction of the air flow is the lift of the wing. In this way, the heavier-than-air aircraft overcomes the gravity of the aircraft with the help of the lift gained on the wings and is able to soar through the air.

In order to solve the third problem, there are control devices in the aircraft, including steering sticks, pedals, elevators, rudders and ailerons. With these devices, the pilot can maneuver the aircraft to rise, turn, descend, .......

The main thing is the wings, the downflow speed is greater than the updraft, and the main thing is to have a good engine, and the engine is very important.

The ascent of an airplane is based on Bernoulli's principle, which states that the greater the velocity of a fluid (including liquid and air), the lower its pressure; The smaller the flow velocity, the greater the pressure. When the aircraft flies, the streamline distribution of the air around the wing is different according to the shape of the cross-section of the wing, and the upper and lower streamlines are dense and the flow velocity is large, and the streamlines below are sparse and the flow velocity is small. From Bernoulli's equation, the pressure above the wing is small, and the pressure below is strong.

This creates a lift force in the direction acting on the wing. The greater the speed at which the aircraft travels, the greater the pressure difference, i.e., the lift. Therefore, the plane must take off at a high speed so that the plane can take to the sky.

Airplanes fly into the sky on the principle of aerodynamics. Most of the lift of the aircraft is generated by the wing, and the air flows to the leading edge of the wing, which is divided into two streams, upper and lower, which flow along the upper and lower surfaces of the wing respectively, and thus form a pressure difference, and the sum of the pressure difference perpendicular to the direction of the relative air flow is the lift of the wing. With the help of the lift gained from the wings, the heavier-than-air aircraft overcomes its own gravity due to the Earth's gravity and soars into the blue sky.

Airplanes fly into the sky on the principle of aerodynamics, the main of which are two fluid theorems: the continuity theorem and Bernoulli's theorem.

Most of the lift of the aircraft is generated by the wings, and the air flows to the leading edge of the wing, which is divided into two streams, upper and lower, which flow along the upper and lower surfaces of the wings respectively, and rejoin at the trailing edge of the wing and flow backwards. The upper surface of the wing is relatively convex and the flow tube is thinner, indicating that the flow rate is increased and the pressure is reduced.

On the lower surface of the wing, the air flow is blocked, the flow tube becomes thicker, the flow velocity slows down, and the pressure increases. As a result, there is a pressure difference between the upper and lower surfaces of the wing, and the sum of the pressure difference perpendicular to the direction of the relative airflow is the lift of the wing. With the help of the lift gained from the wings, the heavier-than-air aircraft overcomes its own gravity due to the Earth's gravity and soars into the blue sky.

The principle of airplanes, this is a matter for scientists. The principle of airplanes, this is a matter for scientists, we just need to do a good job of airplanes. It's good to be able to get to your destination.

Airplanes fly mainly by the power generated by the engines and the lift generated through the wings.

When an airplane flies, some airflow passes through the upper part of the wing, and some passes through the lower part. The upper edge of the wing has a greater curvature than the lower edge, i.e., the airflow travels longer than the lower edge. In this way, the upper part of the wing has a faster flow velocity and less pressure; The lower airflow has a slower flow rate and higher pressure.

It is because of this pressure difference between the upper and lower levels that lift and aerodynamic forces are generated.

So the high-speed taxi run that the aircraft does before take-off is to speed up the airflow velocity on the wing surface to provide a pressure difference. When an airplane takes off, it mostly takes off against the wind, so that the relative speed with the air flow will increase, and the lift will also increase. If you take off with a tailwind, the wind will cancel out the air flow generated during taxiing, and the plane will lose lift and enter a stall state when it flies together.

The Birth of the Airplane:

One of the most significant inventions of the twentieth century was the birth of the airplane. Since ancient times, humans have dreamed of flying in space like birds. And the kite invented by the Chinese more than 2,000 years ago, although it cannot take people into the sky, it can indeed be called the originator of airplanes.

At the beginning of the 20th century, there was a pair of brothers in the United States who made significant contributions to the history of the world's aircraft development, the Wright brothers.

At the time, most people thought that it was impossible for an airplane to fly on its own power, but the Wright brothers did not believe this conclusion, and from 1900 to 1902 their brothers conducted more than 1,000 gliding test flights, and finally in 1903 they built the first manned aircraft to fly under their own power, the "Flyer 1", and the test flight was successful. They were awarded the U.S. Congressional Honor Award in 1909. In the same year, they founded the "Wright Aircraft Company".

This is a great progress made by mankind in the history of aircraft development.

The principle of the plane flying is as follows:

When equal mass of air passes through both the upper and lower surfaces of the wing, different flow velocities are formed above and below the wing. The velocity of air is high and the pressure is low as it passes through the upper surface of the wing, and the velocity is less and the pressure is strong when it passes through the lower surface. Therefore, at this time, the aircraft will have an upward resultant force, that is, an upward lift, due to the existence of lift, so that the aircraft can leave the ground and fly in the air.

The density, temperature and pressure of the air are the three main parameters that determine the state of the air, and the aerodynamic force and size of the aircraft and the quality of the flight performance are related to these parameters during flight. Viscosity and compressibility are two physical properties of air, and one of the reasons why airplanes experience air resistance in flight is because of the stickiness of air. However, when an aircraft flies close to or beyond the speed of sound, there will be a sudden increase in drag, which is related to the compressibility of the air.

Aircraft composition

Most aircraft consist of five main parts, namely the wings, fuselage, tail, landing gear, and power plant, and their main roles are as follows:

1. The main function of the wing is to generate lift to support the aircraft to fly in the air, and also play a certain role in stability and control. Ailerons and flaps are generally installed on the wings, and the ailerons can be manipulated to make the aircraft roll, and the lift of the wings can be increased by lowering the flaps.

2. The main function of the fuselage is to load passengers, passengers, goods, and various equipment, and can also connect other parts of the aircraft such as tail, wings and engines into a whole.

3. The tail includes a horizontal tail and a vertical tail, the horizontal tail is composed of a fixed water level stabilizer and a movable elevator, and the vertical tail comprises a fixed vertical stabilizer and a movable rudder. The main function of the tail is to control the pitch and deflection of the aircraft, and to ensure that the aircraft can fly smoothly.

4. The landing gear is used to support the aircraft and make it take off, land and park on the ground and on the horizontal plane.

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Analysis: Originally, humans wanted to be able to fly freely in the air like birds. Later, after repeated practice, the airplane was invented.

And the plane can fly because of its wings and engines. When the airplane is moving, the air above the wing is fast, and the air under the wing is slow, so that an upward lift is generated, and the plane will fly smoothly into the sky. In addition, the engine in the aircraft is connected to the propeller, and the propeller rotates to drive the airflow, and the aircraft can fly in the sky for a long time.

100,000 why nets for elementary school students).

Why do airplanes fly?

Why do airplanes fly? Despite the cooperation of various departments, the main thing is that the aircraft has a pair of wings with a special profile shape.

Wing profiles are also known as airfoils. A typical airfoil is convex at the top and flat at the bottom, and is often referred to as streamlined. According to the continuity of the fluid and Bernoulli's theorem, the air flow through the upper surface is squeezed compared to the air far ahead, and the flow velocity accelerates and the pressure decreases, and even suction (negative pressure) is formed, and the flow velocity of the air flowing through the lower surface slows down.

As a result, a pressure difference is formed between the upper and lower wing surfaces. This pressure difference is aerodynamic. According to the law of force decomposition, it is broken down along the direction of flight into upward lift and backward resistance.

The drag is overcome by the thrust provided by the engine. The lift is just enough to overcome its own gravity and lift the aircraft into the air. That's why airplanes fly.