7.41 An automobile is to travel through standard air at 100 km/hr. To determine the pressure distribution, a 1/5-scale model is to be tested in water. What factors must be considered to ensure kinematic similarity in the tests? Determine the water speed that should be used. What is the corresponding ratio of drag force between prototype and model flows? The lowers pressure coefficient is Cp = -1.4 at the location of the minumum static pressure on the surface. Estimate the minimum tunnel pressure required to avoid cavitation, if the onset of cavitation occurs at a cavitation number of 0.5.
Factors necessary to ensure kinematic similarity: -model and prototype must be geometrically similar
