차량 DPF 배기시스템 내 공기를 수반한 배기가스 유동장 분석
Exhaust Gas Flow Field Analysis in a Automobile DPF System with Air Flow for Fuel Combustion
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초록
Numerical analysis has been carried out to investigate the flow field characteristics for exhaust gas in automobile engine DPF system. The DPF system performance is largely affected by exhaust gas flow while it passes through the complicated geometry of DOC/DPF system, fan shape structure, and perforated can with air for fuel combustion. Hence the characteristics of fluid velocity, pressure, and streamline are analyzed with velocity uniformity in front of DOC and swirl flow near the fan. It can be seen that the velocity uniformity increases with the gas flow rate including flow acceleration near the lower area of the fan. The air flow also influences the gas flow distribution close to the impeller and fan structure with complicated swirl flow. These results are expected to be applicable as fundamental design data for automobile engine exhaust system.
Abstract
Numerical analysis has been carried out to investigate the flow field characteristics for exhaust gas in automobile engine DPF system. The DPF system performance is largely affected by exhaust gas flow while it passes through the complicated geometry of DOC/DPF system, fan shape structure, and perforated can with air for fuel combustion. Hence the characteristics of fluid velocity, pressure, and streamline are analyzed with velocity uniformity in front of DOC and swirl flow near the fan. It can be seen that the velocity uniformity increases with the gas flow rate including flow acceleration near the lower area of the fan. The air flow also influences the gas flow distribution close to the impeller and fan structure with complicated swirl flow. These results are expected to be applicable as fundamental design data for automobile engine exhaust system.
참고문헌 (4)
- Sang Up Lee, "Characteristics of Air Flow Through a DPF Channel", Proceedings of the KFMA Annual Meeting, 8, pp.1051~1054 (2006)
- 신동원, "DPF의 유동특성에 관한 과도해석 연구", 한국자동차공학회 논문집, 18(1), pp.131~138 (2010), 한국자동차공학회
- Seokyoon Jeong, "A Performance quality by front of catalyst inlet length change of exhaustion reduction system", Transactions of KSAE Spring, 2008, pp.4, 963~967
- S. A. Hashemi, "Presumed PDF Modeling of Reactive Oxy-Fuel Flow in a Model Combustor", The Journal of Energy : Engineering & Management, 2, pp.48~57 (2012)