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首页> 外文会议>Vehicle aerodynamics, 2012. >The Process of Making an Aerodynamically Efficient Car Body for the SAE Supermileage Competition
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The Process of Making an Aerodynamically Efficient Car Body for the SAE Supermileage Competition

机译：为SAE超跑比赛制造具有空气动力学效率的车身的过程

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In the summer of 2010, a new body shell for the SAE Supermileage car of Laval University was designed. The complete shell design process included, amongst other steps, the generation of a shape through the parametric shape modeling software Unigraphics NX7 and the evaluation of aerodynamic forces acting on the chassis using the open source Computational Fluid Dynamics (CFD) software OpenFOAM. The CFD analyses were ran at steady-state using a k-omega-SST turbulence model and roughly 2.5 million cells. An efficient method for evaluating the effect of ambient wind conditions and vehicle trajectory on the track was developed. It considers the proportion of time that the car operates at each combination of velocity and wind yaw angle and computes the overall energy demand of the shell. An iterative process was conducted over a significant number of different shapes, which were generated by joining formula-based guide curves using intersection and tangency conditions. The new shell has a 25 % larger frontal area due to modified design constraints. When aerodynamically compared to the smaller and already highly efficient old vehicle, reductions of 50 % of the negative lift, 15 % of the energy demand when driving forward, and 5 % of the energy demand when turning are achieved by the new design. Also, the drag coefficient is reduced by 20 %. These improvements come from the quasi-NACA profiles on the side and top walls; a reduction of cavities to prevent redundant frontal areas; a short vehicle and smother wheel cover closures; and a thorough study of the nose and tail. This paper describes numerical flow simulations and the changes that were brought to the vehicle body to make it as aerodynamically efficient as possible.
机译：2010年夏天，为拉瓦尔大学的SAE Supermileage汽车设计了一种新的车身外壳。完整的壳体设计过程除其他步骤外，还包括通过参数形状建模软件Unigraphics NX7生成形状以及使用开源计算流体动力学（CFD）软件OpenFOAM评估作用在底盘上的空气动力。使用k-omega-SST湍流模型和大约250万个细胞在稳态下进行了CFD分析。开发了一种评估环境风况和车辆轨迹对轨道影响的有效方法。它考虑了汽车在速度和偏航角的每种组合下运行的时间比例，并计算了外壳的总能量需求。在大量不同的形状上进行了迭代过程，这些形状是通过使用相交和相切条件将基于公式的引导曲线合并而成的。由于修改了设计限制，新外壳的正面面积增加了25％。与新的设计相比，在空气动力学上与更小且已经非常高效的旧车相比，负升力降低了50％，前进时降低了15％的能量需求，转弯时降低了5％的能量需求。而且，阻力系数降低了20％。这些改进来自侧面和顶壁的准NACA轮廓；减少空腔以防止多余的额叶区域；短的车辆和令人窒息的轮罩盖；并仔细研究鼻子和尾巴。本文描述了数值流模拟以及为使车身在空气动力学上尽可能有效而带来的变化。

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