Question

You are conducting a wind tunnel test to measure the aerodynamic drag ("air resistance") over a cylinder. Apply the momentum principle for a control volume to relate the drag force per unit width, w, in terms of the upstream and downstream velocities and pressures. The upstream velocity is a uniform 15.6 m/s. The downstream horizontal velocity measurements are shown in the table below. Upstream pressure is 133.5 Pa (gauge) and downstream pressure is 0.0 Pa (gauge). The diameter of the cylinder is 100 mm. Total wind tunnel height is 240 mm. Neglect any forces on the wind tunnel walls. The horizontal velocity profile is symmetric with respect to the y axis. Table 1: Wind Tunnel Velocity Profile ertical Position (mHorizontal Velocity (m/s 5.0 5.8 7.0 9.2 12.1 15.2 18.0 20.2 21.4 22.4 23.0 23.6 23.9 0 10 20 30 40 60 70 80 90 100 110 120

Answer 1

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