Abstract
In this study, a pressure transducer was installed in an exhaust system to analyze the effect of the change in back pressure according to the change of the confluence geometry of an exhaust pipe system on an exhaust emission. In addition, to perform exhaust gas measurement, the system was warmed up for about 40 s on the chassis dynamometer, and exhaust gas and back pressure measurements were performed simultaneously. In the back pressure measurement results, it was possible to confirm the difference in back pressure according to the change in the confluence shape. In addition, it was also confirmed that there was a clear difference in the exhaust emission measurement result. In particular, the H-type exhaust pipe system showed the highest pressure in the exhaust pipe due to the influence of the confluence geometry. Due to this influence, THC showed the highest measured value in the exhaust emission result. However, the X-type exhaust pipe system showed the lowest pressure due to the influence of the confluence geometry. Due to this influence, the THC showed the lowest measured value in the exhaust emission result. Therefore, through the conclusion of this study, an optimal exhaust system to reduce THC was proposed, and the importance of back pressure in exhaust system design was confirmed.
Highlights
In recent years, high-performance vehicles have been widely distributed due to the dramatically increasing development of automotive technologies
This result is caused by the backflow of exhaust gas during the valve overlap or its combustion with exhaust gas that has not been discharged from cylinders
Shown in the H by pipe, and the lowest pressure is as shown in the pipe. This is because combustion exhaust gas flows back into the 7,cylinders duethe to. Based on this result, when compared with (C), THC in Figure it can be again seen that the pressure difference during the valve overlap and accelerates incomplete combustion decrease in back pressure is related to the decrease in THC
Summary
High-performance vehicles have been widely distributed due to the dramatically increasing development of automotive technologies. The flow area secured to exhibit optimal performance in the high-speed range may cause an increase in harmful exhaust gas in low-speed rotation conditions, such as the idling state, due to the backflow of combustion exhaust gas into engine cylinders [4]. This result is caused by the backflow of exhaust gas during the valve overlap or its combustion with exhaust gas that has not been discharged from cylinders. For Y Pipe, two exhaust pipes are combined into one, which is again separated into two exhaust pipes It exhibits the best power performance in the low-speed rotation range by maintaining the optimal back pressure as it has the smallest flow area at the exhaust gas confluence point. Its benefit is that the tone of the exhaust sound from the engine is generally rough enough to evoke of the emotions of tuning owners [1]
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