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Variable geometry exhaust manifold turbocharging system for an 8-cylinder marine diesel engine

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Abstract

The variable geometry exhaust manifold (VGEM) turbocharging system can realize the switch between two charging modes by the switching valve, and it can give a good performance both at the high load operation and the low load operation. When the switching valve is closed during the low load or transient response operation, the VGEM turbocharging system works as a pulse turbocharging system. When the switching valve is opened during the high load operation, the VGEM turbocharging system works as a semi-constant pressure turbocharging system. This paper puts forward a newly designed VGEM turbocharging system for an 8-cylinder marine diesel engine. The original turbocharging system for this marine diesel engine is a modular pulse converter (MPC). The VGEM turbocharging system simulation model is modified based on the original MPC model; the difference between them is only the exhaust manifold model. The GT-POWER simulations on both steady state and transient state have been done. The results show that in all four loads of 25, 50, 75 and 100%, the average scavenging coefficient of the VGEM turbocharging system is greater than that of the original MPC turbocharging system, while the brake specific fuel consumption (BSFC) is less than that of the original MPC turbocharging system. In the 25% load case, the BSFC could be reduced by 15 g/kW h. The transient analysis shows that the performance of the VGEM turbocharging system is also better than the original.

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Abbreviations

ABDC:

After bottom dead centre

ATDC:

After top dead centre

BBDC:

Before bottom dead centre

BDC:

Bottom dead centre

BSFC:

Brake specific fuel consumption

BTDC:

Before top dead centre

IMEP:

Indicated mean effective pressure

MIXPC:

Mixed pulse converter

MMPC:

Modular multi-purpose pulse converter

MPC:

Modular pulse converter

PC:

Pulse converter

PMEP:

Pumping mean effective pressure

TDC:

Top dead centre

VGEM:

Variable geometry exhaust manifold

VGT:

Variable geometry turbocharger

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Acknowledgments

The authors gratefully acknowledge the support provided by the National Key Lab of Diesel Engine, Turbocharging Tech. In addition, the valuable comments of the reviewers are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiaotong University, 800# Dongchuan Road, Shanghai, People’s Republic of China

    Lei Shi, Kangyao Deng & Yi Cui

  2. Technology Center of the SAIC Motor, 201# Anyan Road, Shanghai, People’s Republic of China

    Shaoming Wang

Authors
  1. Lei Shi
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  2. Shaoming Wang
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  3. Kangyao Deng
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  4. Yi Cui
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Corresponding author

Correspondence to Lei Shi.

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Shi, L., Wang, S., Deng, K. et al. Variable geometry exhaust manifold turbocharging system for an 8-cylinder marine diesel engine. J Mar Sci Technol 17, 252–259 (2012). https://doi.org/10.1007/s00773-012-0161-6

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  • DOI: https://doi.org/10.1007/s00773-012-0161-6

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