I'm trying to measure the change in efficiency for a duct system. As it is, the fan is blowing air straight into a wall and the air then travels down a channel towards a series of outlets (imagine a fan situated in a short circular tube connected perpendicularly to a flat and wide rectangular duct). I am looking at the design of the inlet as well as the geometry around the fan. All I have to check whether or not I have found an improvement is an airspeed indicator. Now, if I place this a bit down into the channel I can see how the airspeed changes as I use different inlet geometries and different geometries around the fan. Am I right in assuming that an increase in the measured airspeed indicates fewer aerodynamic losses?
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