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Originally Posted by KamperBob
Just wanted to say thanks, Bob. I searched a bit. I can find 110V fans for several hundred bux that push well over 10k cfm. I could test well below 60 mph. Scale models don't have to be 1/12-th or less. Combined, a practical sweet spot seems possible. This is a good project to keep inching forward.  |
Bob,you can also do a water tunnel as did Mythbusters for the F-150 tailgate episode.The water is 833X more dense than air and I'm pretty sure you get good Reynolds number 'verisimilitude' at relatively low flow velocities.
This was done at Texas Tech.Food coloring was injected into the flow field just as smoke in a wind tunnel for visualization.
To get a good Cd you need about 20 mph airflow at full-scale.A 24:1 scale model would require a 480 mph airstream.