The drag of an oceanographic research submarine 9 m long is to be estimated from wind tunnel tests with a scale m
Posted: Mon May 02, 2022 9:07 pm
The drag of an oceanographic research submarine 9 m long is to be estimated from wind tunnel tests with a scale model of length 1.5 m and wetted surface area 1.2 m2. The measured drag force in the wind tunnel is 7.9 N at a wind speed of 30 m/s and air temperature of 25℃. If the full-scale submarine is deeply submerged in salt water at 15℃ at what speed can its drag be most accurately predicted? What is the best estimate of its drag at a speed of 2 m/s? Can this estimate be refined by raising or lowering the temperature in the wind tunnel?
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Salt Water 15 Temperature (°C) Density (kg/m) Dynamic viscosity (mº/s) Speed (m/s) Air 25 1.184 1.55 x 10-5 30 1026 1.19 x 10-6 ?
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