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首页> 外文期刊>International Journal of Aerodynamics >New drag reduction design for tractor-trailers using CFD
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New drag reduction design for tractor-trailers using CFD

机译：使用CFD的拖挂车新型减阻设计

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Tractor-trailers have a higher drag coefficient than other vehicles due to their bluff-body shape. Over the years, numerous add-on devices have been invented to help reduce the drag. The current research investigates new add-on devices in the form of humps to reduce the base-drag of tractor-trailers. In the current investigation, computational fluid dynamics (CFD) in the form of unsteady Reynolds-averaged Navier-Stokes simulations is used to determine viable design strategies and optimise the new add-on device designs. A baseline model was built using an Ahmed body in both 2D and 3D. The predicted drag coefficient of the 3D Ahmed baseline model showed good agreement with experimental data. The 2D and 3D simulations with hump(s) showed some difference in drag reduction that was dependent on the hump geometry. A significant 3D effect existed. Results from the baseline validations as well as from simulations of tractor-trailer-like configurations with hump add-on devices are shown to demonstrate the drag reduction possible. While the hump is a conceptual design and may not be applied to full-size semi-truck trailers due to the height limit, it still offers a significant result which makes the applications on other smaller vehicles possible.
机译：拖挂车由于其钝体形状而具有比其他车辆更高的阻力系数。多年来，发明了许多附加设备来帮助减少阻力。当前的研究以驼峰的形式研究了新的附加装置，以减少牵引拖车的基础阻力。在当前的调查中，以不稳定的雷诺平均Navier-Stokes模拟形式的计算流体动力学（CFD）用于确定可行的设计策略并优化新的附加设备设计。使用Ahmed实体在2D和3D中都建立了基线模型。 3D Ahmed基线模型的预测阻力系数与实验数据显示出良好的一致性。带有驼峰的2D和3D模拟显示，减阻的一些差异取决于驼峰的几何形状。存在明显的3D效果。基线验证以及带有驼峰附加装置的类似拖拉机-拖车的配置的模拟结果均显示出可以减少阻力。尽管驼峰是一种概念设计，但由于高度限制，它可能不适用于全尺寸的半卡车拖车，但驼峰仍然提供了显着的结果，这使得在其他小型车辆上的应用成为可能。

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