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Unformatted text preview: then determine p j real from p j model ? The propellor of a 150 m long cargo ship is 2.5 m in diameter and rotates at 100 rpm under normal operating conditions. A 1:100 scale model of the ship and its propellor is to be tested in a towing tank to nd the drag force on the ship that the propellor must overcome. It is known that ows near free surfaces depend on g , whereas eects of water viscosity on this ow can be neglected. 1. Which dimensionless groups must be matched to ensure dynamic similarity? 2. At what rpm should the model propellor rotate? 3. If the drag coecients of the model and the fullsize ship are the same, what is the ratio of power expended by each?...
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This document was uploaded on 10/28/2011 for the course MECHANICAL 332 at Michigan State University.
 Fall '11
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