Determining the coefficient of lift

In summary, the conversation discusses a new method for determining the lift coefficient and raises questions about its accuracy and usefulness. The formula for lift is mentioned and equations are presented to support the new method, but concerns are expressed about its applicability in certain situations.
  • #1
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Been working on a new way of determining the lift coefficient besides the thin airfoil theory,and I don't know if there is already such a method or if I'm wrong.Plz Help.We know,
L=CL×1/2ρv^2A
Now,as lift is a force,then it should be as L=mμ, where μ is the "upwards acceleration".
So, L=mμ=CL×1/2ρv^2A
⇒mμ=CL×1/2ρ[(0)^2+2as]A, because v^2=u^2+2as,and here the initial velocity will be zero.
⇒mμ=CL×1/2ρ2asA
⇒mμ=CL×ρ×a×s×A
⇒CL=mμ/ρasA
That's it.Am I wrong somewhere?...please reply.
 
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  • #2
I suppose the algebra seems correct, but I am not really certain that this would ever be useful. For level flight, there isn't going to be any acceleration upward or downward since ##ma = \Sigma F## and ##\Sigma F## will be zero, yet there is certainly still lift. In other words, your ##\mu## is likely going to be meaningful. Further, for level flight at constant airspeed, your ##a## term will also be zero, meaning your whole ##C_L## will have a ##0/0## term in it and will be undefined, yet ##C_L## is certainly defined and nonzero at that point.
 
  • #3
whoa...would've missed that,thanks!
 

What is the coefficient of lift?

The coefficient of lift is a dimensionless quantity that represents the amount of lift generated by an airfoil or any other aerodynamic body. It is calculated by dividing the lift force by the product of the dynamic pressure and the reference area of the body.

Why is it important to determine the coefficient of lift?

The coefficient of lift is an important parameter in aerodynamics as it helps engineers and scientists understand the performance of different airfoils and design more efficient and effective aircraft. It also allows for the prediction of lift forces at different angles of attack and speeds.

How is the coefficient of lift measured?

The coefficient of lift can be measured experimentally in a wind tunnel, where the lift force and other parameters can be controlled and measured accurately. It can also be calculated using computational fluid dynamics (CFD) simulations.

What factors affect the coefficient of lift?

The coefficient of lift is affected by several factors, including the shape and design of the airfoil, the angle of attack, the airspeed, and the viscosity and density of the fluid. Changes in any of these variables can significantly alter the lift generated by an airfoil.

How does the coefficient of lift differ from the coefficient of drag?

The coefficient of lift represents the lift force generated by an airfoil, while the coefficient of drag represents the drag force. While the coefficient of lift is mostly affected by the shape and design of the airfoil, the coefficient of drag is influenced by factors such as air viscosity and surface roughness. Both coefficients are important in determining the overall aerodynamic performance of an object.

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