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Obtaining drag force from pressure distribution

  • Thread starter IrishAlex
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I'm trying to obtain the drag force acting on a smooth cylinder at the exit plane of a wind tunnel. I took measurements of pressure at regular degree intervals around the cylinder.

The pressure readings are in inches of water, and I know the freestream velocity and the stagnation pressure. I just don't know what to do with the data I have to obtain a value for drag force.
 

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  • #2
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Thanks for all your help. I found Cp at all the points of pressure measurement, multiplied by cos of the angle of rotation, plotted the product versus angle of rotation and integrated from 0 to pi.

Turns out the drag coefficient for the large cylinder is about 0.71 and 1.07 for the small cylinder.
 

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