# lift coefficient

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## lift coefficient

[′lift ‚kō·i‚fish·ənt]
(aerospace engineering)
The quantity CL = 2 LV 2 S, where L is the lift of a whole airplane wing, ρ is the mass density of the air, V is the free-stream velocity, and S is the wing area; this is also applicable to other airfoils.

## lift coefficient

Relationship between angle of attack and lift coefficient.
A dimensionless number used in the formulae for aerodynamic lift that varies with the angle of attack (α) and the shape of the airfoil. The coefficient is derived from wind tunnel data and describes the characteristics of an airfoil.
References in periodicals archive ?
8] calculated aerodynamic lift using the finite volume method to get unstructured tetrahedron mesh of the model, whose results suggested that the conventional aerodynamic evaluation method focusing on steady aerodynamic lift coefficient is insufficient to evaluate automobile straight-ahead stability at high speed.
The Lift Coefficient (Cl) is the lifting force and Drag Coefficient (Cd) is the drag or resistance force that generated by the airfoils are important role in designing wind turbine.
In Figure 7 (b) the distribution of front lift coefficient in the same designs shows a strong correlation between the cooling airflow and rear lift.
This upstream movement dramatically decreases the maximum lift coefficient at relatively high angles of attack, leading to premature stalls.
The styling gives the car an aggressive, purposeful stance, with a focus on aerodynamics that has ensured a zero lift coefficient and a minimum of drag.
The sudden change in camber can also lead to early trailing edge flow separation, limiting the maximum lift coefficient.
The variation of lift coefficient with AoA is presented in Figures 4 and 5.
Nature makes it clear that this propulsion mechanism is very efficient and effective in an aerodynamics view at a low Reynolds number and in the same time allows high degrees of manoeuvrability, humming birds are the best example, while despite requiring a lift coefficient, in the quasi-steady sense, over twice that of any aircraft.
Flight simulations demonstrate that this behaviour had advantages since this high lift coefficient allows for slow glides, which can be achieved with less height loss.
To design such an airship at a large operating scale, the wing must present optimal geometrical characteristics so it can maintain induced resistance, the moment coefficient and the lift coefficient at suitable levels.
In technical terms, Flight 447 was felled by an increasing angle of attack that reduced the lift coefficient, generating a stall that was not addressed in a timely manner.

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