Recently, the driving performance that maximizes driving pleasure, exhaust sound quality, and quietness have been recognized as important elements according to the demands of clients. Technology has been dramatically developed while the evaluation and improvement of the exhaust system have been attempted using various methods to meet the requirements of clients, the largest problem in designing the exhaust system is to maximize performance by forming the optimal back pressure and flow velocity and to reduce the generated noise and vibration. The objective of this study is to propose an optimal geometry of an exhaust system for sports sedans with a V6 and above engine. To achieve this, an experiment was conducted as follows. Before a prototype was fabricated, an exhaust system was designed and the fluid flow was analyzed. A pressure transducer was installed in the prototype, and the exhaust pressures on the exhaust system were measured at idle, medium and high engine speeds. Noise and vibration were also measured to analyze the impact of confluence geometry on the silence of vehicle. Finally, wheel horsepower, torque from wheels were analyzed using a chassis dynamometer to identify an output difference according to confluence chamber geometry and propose an optimal geometry.

最近，根据客户的需求，使驾驶乐趣，排气音质和安静度最大化的驾驶性能已被视为重要因素。在使用各种方法评估和改进排气系统以满足客户需求的同时，技术得到了飞速发展，设计排气系统的最大问题是通过形成最佳的背压和流速来最大化性能。减少产生的噪音和振动。这项研究的目的是为具有V6及以上发动机的运动型轿车提出一种排气系统的最佳几何形状。为此，进行了如下实验。在制造原型之前，设计了排气系统并分析了流体流动。原型中安装了一个压力传感器，并在怠速，中速和高速发动机转速下测量了排气系统上的排气压力。还测量了噪声和振动，以分析融合几何形状对车辆静音性的影响。最后，使用底盘测功机分析车轮功率，车轮扭矩，以根据合流室几何形状确定输出差异，并提出最佳几何形状。