This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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 μ SL = 1 . 789 × 10-5 kg/(m s) , and the density and viscosity of the water in the tunnel can be taken to be ρ Water = 998 . 2 kg/m 3 and μ Water = 0 . 001 kg/(m s) , respectively....
View Full Document
This note was uploaded on 10/02/2010 for the course MAE 3050 taught by Professor Caughey during the Fall '08 term at Cornell.
- Fall '08