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An Experimental Study of Drag Reduction Devices for a Trailer Underbody and Base
| 题名： | An Experimental Study of Drag Reduction Devices for a Trailer Underbody and Base |
| 作者： | Salari, K;Ortega, J M; |
| 关键词： | 42 ENGINEERING; CONFIGURATION; DRAG; REYNOLDS NUMBER; AERODYNAMICS; WIND TUNNELS; TRUCKS |
| 摘要： | Low speed wind tunnel measurements are made on a 1/16th scale generic tractor-trailer model at a width-based Reynolds number of 325,000. The model is fixed to a turntable, allowing the yaw angle to be varied between {+-}14 degrees in 2 degree increments. Various add-on drag reduction devices are mounted to the model underbody and base. The wind-averaged drag coefficient at 65 mph is computed for each configuration, allowing the effectiveness of the add-on devices to be assessed. The most effective add-on drag reduction device for the trailer underbody is a wedge-shaped skirt, which reduces the wind-averaged drag coefficient by 2.0%. For the trailer base, the most effective add-on drag reduction device is a set of curved base flaps having a radius of curvature of 0.91 times the trailer width. These curved base flaps reduce the wind-averaged drag coefficient by 18.8%, providing the greatest drag reduction of any of the devices tested. When the wedge-shaped skirt and curved base flaps are used in conjunction with one another, the wind-averaged drag coefficient is reduced by 20%. |
| 报告类型： | 科技报告 |
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