Engineering, 13.03.2020 17:00 darlaaa

An airship is to operate at 20 m/s in air at standard conditions (rho = 1.225 kg/m3, p = 101,300 Pa). A model is constructed to 2 scale and tested in a variable-pressure wind tunnel at the same air temperature to determine the drag.

a) What criterion should be used to determine dynamic similarity? (You may assume that roughness is not important for this problem.)

(b) If the model is tested at 20 m/s, what pressure should be used in the wind tunnel?

(c) If the model drag force is found to be 250 N, what will be the drag of the full-scale airship?

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An airship is to operate at 20 m/s in air at standard conditions (rho = 1.225 kg/m3, p = 101,300 Pa)...