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Jan 3 rd, 2019

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Aerodynamic coefficients plays an important role in performance analysis as well as  design of aeroplanes.Coefficient of lift is defined as Lift divided by dynamic pressure, L/{q_\infty }S where as drag coefficient is defined as Drag divided by dynamic pressure, D/{q_\infty }S .

Coefficient of lift,maximum or {C_{L,\max }} is the determining factor for stalling velocity of aircraft.The higher is the {C_{L,\max }} the lower is the stalling velocity.{V_{stall}} = \sqrt {\frac{{2W}}{{{\rho _\infty }S{C_{L,\max }}}}}

However,{C_{L,\max }} can be increased by the use of mechanical devices like high-lift devices.High lift devices include flaps,slats and slots on the wing.Air plane flying at given altitude with maximum thrust {T_{\max }}, the maximum value of {V_\infty } ,corresponds to flight at {C_{D,\min }}.{V_{\max }} = \sqrt {\frac{{2{T_{\max }}}}{{{\rho _\infty }S{C_{D,\min }}}}}
The actual value of {C_L} and {C_D} for a given body shape just depend on the orientation of body in the flow,that is angle of attack.

Therefore,aerodynamic coefficients are important engineering quantities for determining the stalling velocity by {C_{L,\max }} and maximum velocity by {C_{D,\min }} .

Lift to drag ratio is the measure of aerodynamic efficiency of aircraft .It is given as \frac{L}{D} = \frac{{{q_\infty }S{C_L}}}{{{q_\infty }S{C_D}}} = \frac{{{C_L}}}{{{C_D}}}

The importance of aerodynamic efficiency L/D is that at a given velocity ,L/D should be as high as possible,the higher L/D is more efficient is the body.

4 Comments on this article

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  • GreggAcedo 9th October 2019

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