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Effects of Dual Loop EGR on Performance and Emissions of a Diesel Engine Tianjin Univ
- Format:
- Conference/Event
- Author/Creator:
- Mao, Mao, author.
- Conference Name:
- SAE 2015 World Congress & Exhibition (2015-04-21 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2015
- Summary:
- AbstractAn experimental study is carried out to compare the effects of high-pressure-loop, low-pressure-loop and dual-loop exhaust gas recirculation systems (HPL-EGR, LPL-EGR and DL-EGR) on the combustion characteristics, thermal efficiency and emissions of a diesel engine. The tests are conducted on a six-cylinder turbocharged heavy-duty diesel engine under various operating conditions. The low-pressure-loop portion (LPL-Portion) of DL-EGR is swept from 0% to 100% at several constant EGR rates, and the DL-EGR is optimized based on fuel efficiency.The results show that the LPL-EGR can attain the highest gross indicated thermal efficiency (ITEg) in the three EGR systems under all the tested conditions. At a middle load of 0.95 BMEP, 1660 r/min, the pumping losses of LPL-EGR lead to the lowest BTE among the EGR systems. The HPL-EGR can achieve the best brake thermal efficiency (BTE) and emissions within the EGR rate of 22.5% mainly due to the reduced pumping losses. For the DL-EGR, the low-pressure loop is enabled when the EGR rate exceeds 22.5%, and the LPL-Portion should be increased as the EGR further increases. The DL-EGR can achieve the best BTE and emissions. This is because the DL-EGR can achieve an optimum trade-off performance between the ITEg and pumping losses, and the lowest emissions are related to the proper ignition delay and equivalence ratio. As the engine load decreases, the low-pressure loop in DL-EGR mode should be activated at a higher EGR rate. At a lower speed of 1330 r/min, 1.43 MPa BMEP, the HPL-EGR can achieve a slightly better BTE within the EGR rate of 12%. The DL-EGR can achieve the best BTE for the higher EGR rates, but the emissions of LPL-EGR are much better than that of DL-EGR
- Notes:
- Vendor supplied data
- Publisher Number:
- 2015-01-0873
- Access Restriction:
- Restricted for use by site license
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