This investigation included design, fabrication, and wind tunnel testing of two identical cars in close proximity. The objective was to find the pressure drag and side force on each of the cars and determine how the wake of the front car affects the drag and side force on the aft car and at the same time how the front car is affected by having a car in its wake. The tests were performed in the 32-by-45 inch wind tunnel at Embry-Riddle Aeronautical University in Prescott, Arizona. The dimensions of the cars were 6-inches long by 3-inches wide and 2-1/10 inches tall. The flat plate used to simulate the ground bad dimensions of 30-by-42 inches, and bad slots drilled for movement of the cars. A total of 18 pressure taps were used in each car to find the pressure distribution about the car. The team found that the drag was most strongly affected when the cars were within one-and-a-half car lengths of each other in the direction of the flow. The front car's wake produces a higher drag for the back car when the back car moves to the side. Flow visualization data was collected and compared with the pressure data. This experiment was run at Reynolds Numbers of 612,000, 514,000 and 364,000 based on the car length. A general trend of increase in wake size as the velocity increases was recorded during the flow visualization.
Experimental wake investigations of identical cars in close proximity
Experimentelle Untersuchung des Nachlaufs dicht nebeneinander fahrender identischer Fahrzeuge
AIAA Applied Aerodynamics Conference, 21 ; 1148-1153
2003
6 Seiten, 10 Bilder, 4 Quellen
Conference paper
English
AIAA-2003-3817 Experimental Wake Investigation of Identical Cars in Close Proximity
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