(b) An aircraft weighing 1337 kN when fully loaded has a wing area of 226 m2. It is to take off at velocity of 300 km/h. Assume the airport is at 3000m above sea level. The wing has the characteristics of an airfoil shown below (C vs a). What is (a) the necessary angle of attack and induced drag coefficient if the wing span is 30m. The pressure variation in the atmosphere is given as: p = Ps (1 6.5K Ts = km dT Where R is the gas constant for air, a is the lapse rate dz (15+273)K, R=287 J/K/kg, subscript s=sea-level. Ps=101.325KP.. Chord 0.48 0.40 0.32 1.6 0.24 1.2 0.8 0.16 Ce 0.08 0.4 0.4 16 24 32 Angle of attack, a (degrees) Lift coefficient, CL Drag coefficient, C,
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
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