| Summary: | 碩士 === 元智大學 === 機械工程學系 === 106 === We present an experimental investigation of the effect of DBD plasma actuators based active flow control for a truck model. We have considered two different kinds of electrode shapes which are linear and comb-shaped actuators. The DBD plasma actuators are placed at the leading and/or trailing edges of the trailer, respectively. There are three different tests for the drag reduction. The first test is the drag measurement at the Reynolds number varying from 25000 to 40000. At Re = 25000, the results show that the drag reduction of the three-comb-shaped actuator reaches a maximum of 9%, while the linear actuator has much less effect about 1-2%. The second test is the flow visualization for the wake region of the truck at Re = 3500 to 7000. The results show that the higher voltage input of the plasma actuator mounted at the trailing edge of the trailer produces significant size reduction of the wake region. The last test is PIV measurement to quantize the flow field at Re = 3500. The effect of the comb-shaped actuator to the wake reduction is much better than that using the linear actuator at the same location. Thus, this study proves the drag reduction qualitatively and quantitatively using DBD plasma actuators.
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