The square test section of a small laboratory wind tunnel has sides of width W =

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The square test section of a small laboratory wind tunnel has sides of width W = 40 cm. At one measurement location, the turbulent boundary layers on the tunnel walls delta_1 = 1 cm thick. The velocity profile is approximated well by the 1/7-power expression. At this location, the freestream air speed is U_1 =20 m/s> and the static pressure is p_1 = -250 Pa (gage). At a second measurement location downstream, the boundary layer thickness is delta_2 = 1.3 cm Evaluate the air speed in the freestream in the second section. Calculate the difference in static pressure from section (1) to section (2)

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