The innovation in the automotive industry must prioritize the issue of energy security and the environment. One aspect of the innovations is regarding the development of more aerodynamic vehicle design. The study of vehicle aerodynamics has been considered as very important, due to its direct relation to the safety and efficiency factors of energy utilization. Applying active control on the onset region of flow separation is one example of the efforts. This study aims to analyse the effect of the application of active control by suction to the aerodynamic drag of the vehicle model through qualitatively observations of flow dynamics and quantitatively pressure fields. The test model is a modified Ahmed body with 35 slant angles and varied flow orientations. This study has been conducted in both numerical computation and experimental testing at a suction velocity of 1.0 m/s and upstream velocity of 11.1 m/s, 13.9 m/s, and 16.7 m/s, respectively. The results have found out that the attachment of active control is proven capable able to delay flow separations, to increase the pressure coefficients on the back wall, and to reduce aerodynamic drag by 10.8487% for computational methods and 10.9748% for experimental methods.

汽车行业的创新必须优先考虑能源安全和环境问题。创新的一个方面是关于更多空气动力学车辆设计的开发。汽车空气动力学的研究被认为是非常重要的，因为它直接关系到能源利用的安全和效率因素。在流动分离的起始区域应用主动控制是努力的一个例子。本研究旨在通过流动动力学的定性观察和压力场的定量观察，分析应用吸力主动控制对车辆模型气动阻力的影响。测试模型是经过修改的 Ahmed 体，具有 35 个倾斜角和不同的流动方向。本研究分别在吸入速度为 1.0 m/s 和上游速度为 11.1 m/s、13.9 m/s 和 16.7 m/s 的数值计算和实验测试中进行。结果发现，主动控制的附件被证明能够延迟流动分离，增加后壁上的压力系数，并将空气动力阻力降低 10.8487%（计算方法）和 10.9748%（实验方法）。