Where does the power come from after the plane takes off?

Most importantly, this plane has a pair of wings with special cross-sectional shapes. A wing profile is also called an airfoil. The typical airfoil is convex on the top and flat on the bottom, which is usually called streamline. According to the continuity of fluid and Bernoulli's theorem, compared with the air far ahead, the airflow passing through the upper wing surface is squeezed, and the flow speed is accelerated, the pressure is reduced, and even suction (negative pressure) is formed, while the flow speed of the airflow passing through the lower wing surface is slowed down. So there is a pressure difference between the upper and lower wing surfaces. This pressure difference is aerodynamic force. According to the law of force decomposition, it is divided into upward lift and backward resistance along the flight direction. The thrust provided by the engine overcomes the resistance. Lift can just overcome its own gravity and lift the plane into the air. This is the mystery of why airplanes fly.

If you ask, the energy is aviation kerosene.

Aviation kerosene is one of petroleum products. English name Jet fuel No.3, alias aviation kerosene. It is a transparent liquid mixed with straight-run distillate, hydrocracking, hydrofining and other components and necessary additives. It is mainly composed of hydrocarbons with different fractions.

Aviation kerosene is mainly used as fuel for aviation turbine engines. Gasoline is unsafe, volatile and flammable, but piston engines are still in use. The viscosity of diesel oil is too high, so it is not suitable for turbine engines, because it needs a small nozzle to spray the fuel into a mist, so that it can be fully mixed with high-pressure and high-temperature air and produce fierce combustion.