We will idealize the spoiler as a flat plate parallel to the flow, and ignore th

Question

We will idealize the spoiler as a flat plate parallel to the flow, and ignore the supports holding it up. The spoiler is 300 mm wide (in the flow direction) by 2 m long - this is a pretty big spoiler. Draw the velocity boundary layers on the spoiler schematically. For the car going 60 mph, is the boundary layer flow laminar or turbulent over the spoiler? Assume the average coefficient of friction for flow over a flat plate is given by Cf,L = 1.328ReL -1/2 where L is the length of the plate in the flow direction. Based on this, what is the total shear force on the spoiler at 60 mph? Note that there are other forces on the spoiler as well, such as lift forces.

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