The air doesn't have a net upwards flow. The net acceleration is downwards and the net velocity aft of the trailing edge of a wing is downwards. There's a Newton third law pair of forces, the wing exerts a downwards force onto the air, and the air reacts with an upwards force on the wing and also reacts by accelerating downwards. Assuming this is level flight, gravity keeps the aircraft flying level instead of accelerating upwards.marinepyre said:
There's not sufficient information. The maximium lift to drag ratio occurs where the lines cross, but there's no scale on the drag axis, and there's no information about the weight of the aircraft to compare the drag force against, even if the drag axis had a scale.marinepyre said:
Bernoulli's Principle states that as the speed of a fluid increases, its pressure decreases. This principle is used to explain the lift generated by an aerofoil, as the air moving over the curved surface of the aerofoil has a higher velocity, resulting in lower pressure and creating lift.
An aerofoil is designed with a curved shape, with the top surface curved more than the bottom. As air flows over this shape, it has to travel a longer distance over the curved top surface compared to the flat bottom surface. This results in the air on top of the aerofoil having a higher velocity and lower pressure, causing the aerofoil to be lifted upwards.
The lift generated by an aerofoil is affected by several factors, including the shape of the aerofoil, the speed of the air, the density of the air, and the angle of attack (the angle at which the aerofoil meets the oncoming air). A change in any of these factors can affect the lift generated by the aerofoil.
Bernoulli's Principle is applied in many real-world situations, including the design of airplane wings, the creation of lift in wind turbines, and the functioning of carburetors in engines. It is also used in the study of fluid dynamics and the design of hydraulic systems.
No, Bernoulli's Principle is a fundamental principle of fluid mechanics and cannot be violated. However, other factors, such as air turbulence and external forces, can affect the lift generated by an aerofoil and may appear to contradict the principle. But overall, Bernoulli's Principle always holds true.