Question: A proposed free stream velocimeter would use a cylinder with pressure taps at = 180 and at 150. The pressure difference would be a measure

A proposed free stream velocimeter would use a cylinder with pressure taps at θ = 180° and at 150°. The pressure difference would be a measure of stream velocity U∞. However, the cylinder must be aligned so that one tap exactly faces the free stream. Let the misalignment angle be δ, that is, the two taps are at (180° + δ) and (150° + δ). Make a plot of the percent error in velocity measurement in the range –20° < δ < +20° and comment on the idea.

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