Why does the wing of the Boeing 787 have a curvature?

This is a design innovation of the Boeing 787, which can achieve the effect of winglets to a certain extent without affecting lift, reducing the possibility of forming vortex airflow.

It is convenient for the aircraft to gain the lifting force and reduce the air resistance.

The reason why the wing of the Boeing 787 has a curvature:

This is a type of wing that uses a special wing profile (airfoil) called a supercritical airfoil. It increases the critical Mach number of the wing, delaying the sharp increase in drag of the wing at high subsonic speeds.

The shape of the supercritical airfoil is characterized by a blunt and rounded leading edge compared to the ordinary airfoil, with a flat upper surface and an inverse concave lower surface near the trailing edge, and a thin trailing edge that curves downward. The velocity increases more as the airflow bypasses the leading edge of the ordinary airfoil (the sharper the leading edge, the greater the angle of attack, the more it increases), and the velocity continues to increase on the upper surface of the airfoil. The greater the thickness of the airfoil, the more the upper surface bulges upwards and the more the velocity increases.

When the flight speed is high enough (equivalent to Mach number, the local flow velocity on the upper surface of the airfoil can reach the speed of sound. The flight Mach number at this time is called the critical Mach number. As the flight speed increases, a strong shock wave appears on the upper surface, causing the airflow to separate and increase the drag of the wing sharply.

In order to maintain the economy of the aircraft's flight, the flight Mach number should not exceed the critical Mach number. If you want to increase the flight speed, you need to find a way to increase the critical Mach number of the wing. Reducing the thickness of the wing or adopting a swept wing can increase the critical Mach number, but this will increase the weight of the wing.

The use of supercritical wings increases the critical Mach number without having to pay the price of increasing the weight of the wing. The leading edge of the supercritical airfoil is obtuse and rounded, and the velocity increases less when the air flow is circulating, and the flat upper surface makes the local velocity change little. In this way, the local airflow on the upper surface reaches the speed of sound only when the flight Mach number is high, i.e., its critical Mach number is high.

After reaching the speed of sound, the local airflow velocity increases more slowly, the shock wave formed is weaker, and the drag increases more slowly. Supercritical wings can also be used to reduce the weight of aircraft structures. If a high-subsonic aircraft with swept wings were to switch to supercritical wings, the wing thickness could be changed to a straight wing while maintaining the same flight speed, which would reduce the weight of the wing and improve the low-speed aerodynamics of the wing.

Thick wings with the same sweep angle can also reduce the weight of the wing and increase the volume in the wing for fuel or other equipment. The supercritical wing has better lift characteristics at low speed and transonic speed due to the obtuse roundness of the leading edge, and it is possible that it will be applied to supersonic aircraft in the future.

No plane has an arc when it flies, and you can see it very clear when the plane lands.

Hello, it is my pleasure to serve you and give you the following answer: the wing of the Boeing 787 is in the second row. Causes of the problem:

1.Due to the improper design of the wing structure, the structure of the wing is damaged, which affects the normal flight of the aircraft. 2.

Due to the improper structural design of the wing, the structure of the wing is damaged, which affects the normal flight of the aircraft. 3.Due to the improper structural design of the wing, the structure of the wing is damaged, which affects the normal flight of the aircraft.

Workaround and practice steps:1First of all, the structure of the wing should be inspected to determine if the structure of the wing has been damaged.

2.Secondly, the structure of the wing should be repaired to ensure that the structure of the wing can work properly. 3.

Finally, regular maintenance should be performed on the structure of the wing to ensure that the structure of the wing is working properly. Teaching:1

First of all, students should be given an understanding of the structure of the wing so that they can properly check the structure of the wing. 2.Secondly, students should be taught how to repair the structure of the wing so that they can properly repair the structure of the wing.

3.Finally, students should be made aware of the methods of structural maintenance of the wing so that they can properly maintain the structure of the wing. Personal Tips:

1.Extreme care should be taken when inspecting, repairing, and maintaining the structure of a wing to ensure that the structure of the wing is working properly. 2.

When inspecting, repairing, and maintaining the structure of a wing, the correct steps should be followed to ensure that the structure of the wing is working properly. 3.When inspecting, repairing, and maintaining the structure of a wing, the right tools should be used to ensure that the structure of the wing is working properly.

2.The structural design of the wing must meet certain specifications to ensure that the structure of the wing can work properly. 3.

Extreme care should be taken when inspecting, repairing, and maintaining the structure of a wing to ensure that the structure of the wing is working properly.

Winglets or wingtips, also known as wingtips or wingtip sails.

The lift required for the aircraft to maintain normal flight is generated by the pressure difference between the upper and lower surfaces of the wings, the pressure on the lower surface is greater than that of the upper surface, and the air on the lower surface of the wing near the wingtip will flow around the upper surface to form the wingtip vortex, which is called induced drag in fluid mechanics, resulting in a decrease in the pressure difference between the upper and lower surfaces of the wing in the area near the wingtip, resulting in a decrease in the lift generated in this area. In order to weaken the influence of this circumferential phenomenon on lift, wingtips are installed on the wingtips of many aircraft to obstruct the air flow around the upper and lower surfaces, reduce the lift-induced drag caused by the wingtip vortex, reduce the damage of the surround flow to lift, improve the lift-to-drag ratio, and achieve the goal of increasing lift. For powered aircraft, fuel consumption can also be reduced.

However, to increase the winglets, the wing end structure will be more complicated to assemble the winglets, and will also add some additional weight, if the winglets are installed and only fly short-range routes within two hours, the fuel consumption will increase the base spike, and the long-range routes can be used to reduce fuel consumption.

It doesn't matter if it's a single winglet or a double winglet, the effect is the same. Referring to the explanation of induced resistance, there is a diagram that is very intuitive.