Ax= 2.0 m 2.0 m (1) (2)
A two-dimensional converging duct is being designed for a high-speed wind tunnel. The bottom wall of the duct is to be flat and horizontal, and the top wall is to be curved in such a way that the axial wind speed u increases approximately linearly from u1 = 100 m/s at section (1) to u2 = 300 m/s at section 2. Meanwhile, the air density ? is to decrease approximately linearly from ?1 = 1.2 kg/m3 at section (1) to ?2 = 0.85 kg/m3 at section (2). The converging duct is 2.0 m long and is 2.0 m high at section (1). (a) Predict the y-component of velocity, ?(x, y), in the duct. (b) Plot the approximate shape of the duct, ignoring friction on the walls. (c) How high should the duct be at section (2), the exit of the duct?
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