Nice thought, but it could produce invalid results. The biggest problem is, airflow across one part of the car will influence flow across other parts. You'd need a blower big enough to move air across the entire car, and for at least a few feet to either side.
Another problem is speed. You need the air to go fast enough to transition from laminar to turbulent at the same point on the car. I've heard you should test at >30mph.
And if you want to test things that are near the ground, you want the ground to be moving and the wheels to be turning.
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