K4.5 m D- You have a helicopter that weighs 1000 kg. The flow induced by the propeller is shown on the side, indicated b

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K4 5 M D You Have A Helicopter That Weighs 1000 Kg The Flow Induced By The Propeller Is Shown On The Side Indicated B 1 (48.29 KiB) Viewed 47 times

K4.5 m D- You have a helicopter that weighs 1000 kg. The flow induced by the propeller is shown on the side, indicated by two streamlines with the relevant dimensions. Let's call the inlet on the top '1' and the outlet at the bottom '2'. Assume that the pressure of the air is atmospheric (Patm = 101kPa) downstream of the propeller, and the air is incompressible with a density of 1.222kg/m3. (a) Using conservation of mass, find an expression for the velocity at point 1, Vi in terms of Vz, A1 and Az. -4.25 m D (b) Using conservation of momentum and Bernoulli's equation, -4.5 m D-1 find the air velocities Vi and V2 in meters per second. (Hint: Apply Bernoulli between the inlet and the outside atmosphere). (C) Using conservation of energy, calculate the minimum power required to keep the helicopter at a hovering position. You may assume that the air is not heated up (no heat flux, and the enthalpy, h = a + P/p is the same at the inlet and outlet.