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Unformatted text preview: (b) Estimate the (stagnation) pressure at the nose of a model mounted in the test section. Note: the density of water is given below, in Exercise 5. 3. We wish to know the drag of a prototype blimp (airship) that will move through Standard Sea-level air at V p = 10 m/s. We will perform a model experiment in which a 1/30 scale model (based on linear dimension) of the prototype will be tested in a water tunnel. (a) What should the velocity in the water tunnel be in order to ensure dynamical similarity? (b) If the measured drag on the model in the water tunnel for a properly scaled experiment is D m = 3 , 000 N, what will be the corresponding drag force D p on the prototype blimp? Note: the viscosity of air at standard sea level conditions is SL = 1 . 789 10-5 kg/(m s) , and the density and viscosity of the water in the tunnel can be taken to be Water = 998 . 2 kg/m 3 and Water = 0 . 001 kg/(m s) , respectively....
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- Fall '08