But correctly applied, it predicts 100% of the lift. If you look at the overall context you'll see that Bernoulli's equation is a small and relatively unimportant part of the overall theory. This trick (mis)leads some into thinking Bernoulli's equation somehow "explains" the physics, but without the context of the rest of steps it makes little sense. The thing is, almost all of the physics is in step one - the rest is a bunch of hairy math and then a calculational trick at the end to use Bernoulli's equation to turn speed into pressure. So, Bernoulli's principle is responsible for 100% of the lift. integrate the pressure over the airfoil surface to get the lift.ĭone correctly, this number is 100% of the lift.Now that you know the speed everywhere, use Bernoulli's equation to substitute pressure for speed.Forget about the direction and just use the magnitude of the vector - this is the speed.the solution is a vector field that represents the speed and direction of the airflow at each point in space.solve those differential equations and apply boundary conditions to get a solution.
write down the differential equations expressing conservation of momentum, conservation of energy, and conservation of mass.To grossly oversimplify things, classical aerodynamics calculates lift something like this: However, applied correctly Bernoulli's equation can be used to predict 100% of the lift. The problem is that popular explanations using Bernoulli's principle usually make a dog's breakfast out of things, so I understand why you think it's a "flawed" explanation - usually it is. Both approaches explain 100% of the lift. The fact is that 100% of the lift can be explained by Newton's laws and 100% can be explained by Bernoulli's equation. Sometimes you will see statements like 'some of the lift is caused by Bernoulli's principle and some of it is caused by Newton's laws", but this is the wrong way to think about it.
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