扩散器是跑车中的关键部件,通过增加下压力和减少阻力来增强空气动力学。以前的研究集中在它对扩散器入射的依赖性上,高度,和基础压力。汽车的设计,特别是后端形状和后翼的存在,影响基础压力和扩散器的性能。先前的研究已经研究了扩散器几何形状对空气动力学性能的影响,但目前的研究是第一个检查扩散器和后轮胎之间的关系。它还提供了关于不同扩散器设计参数对阻力和下压力的影响的具体和定量结果。使用计算流体动力学(CFD)研究了后轮胎与双元件倒置机翼扩散器之间的关系。这是一个重要的问题,因为扩散器是跑车的关键部件,它的设计可以显着影响空气动力学性能。使用CFD模拟汽车模型周围的空气流动。CFD模型基于日产Sunny(Versa)型Almera设计,扩散器主元件和襟翼机翼角度设置为4°和15.5°,分别。襟翼间隙,重叠距离,和机翼高于地面的行驶高度进行了变化,以实现最佳的空气动力学设计。研究发现,机翼的行驶高度显着影响通过扩散器的流量。扩散器显著影响基础压力和下压力生产。增加行驶高度会降低基础压力,导致下压力增加,直到车身附近的特定点,下压力进一步增加。研究得出的结论是,根据升阻结果和汽车的允许尺寸,选择了最佳的双元件扩散器设计,机翼行驶高度,元素间隙,和重叠的距离。最终,最好的扩散器机翼设计具有154毫米的行驶高度,10毫米的间隙距离,和5毫米的重叠。与基准汽车模型相比,该设计减少了大约2.7%的阻力,并显着增加了下压力十倍。
The diffuser is a critical component in sports cars, enhancing aerodynamics by increasing downforce and reducing drag. Previous studies have focused on its dependence on diffuser incidence, height, and base pressure. The design of the car, particularly the rear end shape and the rear wing\'s presence, affect base pressure and the diffuser\'s performance. Previous studies have investigated the effects of diffuser geometry on aerodynamic performance, but the current study is the first to examine the relationship between the diffuser and the rear tires. It also provides specific and quantitative results on the impact of different diffuser design parameters on drag and downforce. The relationship between the rear tires and the double-element inverted wing diffuser using computational fluid dynamics (CFD) was investigated. This is an essential problem because the diffuser is a critical component of sports cars, and its design can significantly impact aerodynamic performance. CFD was used to simulate the flow of air around the car model. The CFD model was based on the Nissan Sunny (Versa) type Almera design, and the diffuser main element and flap wing angles were set at 4 and 15.5°, respectively. The flap gap, overlap distance, and wing ride height above the ground were varied to achieve an optimal aerodynamic design. The study found that the wing\'s ride height significantly influences the flow through the diffuser. The diffuser significantly impacts base pressure and downforce production. Increasing the ride height decreases base pressure, leading to an increase in downforce until a specific point near the car body, where downforce further increases. The study concluded that the best double-element diffuser design was selected based on lift-to-drag results and the allowable dimensions of the car, wing ride height, element gap, and overlap distances. Ultimately, the best diffuser wing design features a ride height of 154 mm, a gap distance of 10 mm, and an overlap of 5 mm. This design reduces drag by approximately 2.7 % and remarkably increases downforce ten times compared to the baseline car model.