Abstract This paper concentrates on the interaction of a car body with the surrounding airflow, in order to provide small changes for reducing vehicle fuel consumption by reducing drag. There are many passive and active methods for this purpose, the main goal of this project is the development of passive drag reduction devices for the simplified reference model (Ahmed body with 25°, 30°, and 35° slant angle) used to represent bluff body vehicles. Passive flow control is performed by adding linking tunnels at the rear of the bluff body, blowing the flow from the sidewalls (high-pressure zone) to the wake region (low-pressure zone). The movement of a high-pressure flow to the wake zone reduces the wake size, which reduces the pressure drag. A numerical and experimental analysis of this passive method is carried out. The optimal configuration was reached by numerical analysis (showing a drag reduction of up to 5%) and after that, experimental tests were performed in a wind tunnel to check the effect of this passive flow control on an Ahmed body 25°.

中文翻译：

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通过后连接隧道对 Ahmed 车身进行被动流量控制

摘要 本文着眼于车身与周围气流的相互作用，旨在通过减少阻力为降低车辆油耗提供微小的变化。为此目的有许多被动和主动方法，该项目的主要目标是为用于表示虚张声势的简化参考模型（具有 25°、30° 和 35° 倾斜角的 Ahmed 体）开发被动减阻装置车身车辆。被动流量控制是通过在钝体后部增加连接隧道来实现的，将气流从侧壁（高压区）吹向尾流区（低压区）。高压流向尾流区的移动减小了尾流尺寸，从而降低了压力阻力。对该被动方法进行了数值和实验分析。