|Table of Contents|

Citation:
　Shengli Wei,Chengcheng Wu,Shuzhe Yan,et al.Miller Cycle with Early Intake Valve Closing in Marine Medium-Speed Diesel Engines[J].Journal of Marine Science and Application,2022,(1):151-160.[doi:10.1007/s11804-022-00250-5]
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Miller Cycle with Early Intake Valve Closing in Marine Medium-Speed Diesel Engines

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Title:
Miller Cycle with Early Intake Valve Closing in Marine Medium-Speed Diesel Engines
Author(s):
Shengli Wei;  Chengcheng Wu;  Shuzhe Yan;  Tongyuan Ding;  Jie Chen
Affilations:
Author(s):
Shengli Wei;  Chengcheng Wu;  Shuzhe Yan;  Tongyuan Ding;  Jie Chen
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Keywords:
Medium-speed diesel engine; Miller cycle; Combustion; NOx emission; Early intake valve closing (EIVC)
分类号:
-
DOI:
10.1007/s11804-022-00250-5
Abstract:
In this study, a one-dimensional simulation was performed to evaluate the performance of in-cylinder combustion to control NO x emissions on a four-stroke, six-cylinder marine medium-speed diesel engine. Reducing the combustion temperature is an important in-cylinder measure to decrease NOx emissions of marine diesel engines. The Miller cycle is an effective method used to reduce the maximum combustion temperature in a cylinder and accordingly decrease NOx emissions. Therefore, the authors of this study designed seven different early intake valve closing (EIVC) Miller cycles for the original engine, and analyzed the cycle effects on combustions and emissions in high-load conditions. The results indicate that the temperature in the cylinder was significantly reduced, whereas fuel consumption was almost unchanged. When the IVC was properly advanced, the ignition delay period increased and the premixed combustion accelerated, but the in-cylinder average pressure, temperature and NOx emissions in the cylinder were lower than the original engine. However, closing the intake valve too early led to high fuel consumption. In addition, the NOx emissions, in-cylinder temperature, and heat release rate remarkably increased. Therefore, the optimal timing of the EIVC varied with different loads. The higher the load was, the earlier the best advance angle appeared. Therefore, the Miller cycle is an effective method for in-engine NOx purification and does not entail significant cost.

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Memo

Memo:
Received date: 2021-07-08;Accepted date: 2021-10-24。
Foundation item:Supported by the Industry-UniversityResearch Collaboration Project of Jiangsu Province (Grant No. BY2019048); the 19th batch of student scientific research projects of Jiangsu University (19A306).
Corresponding author:Shengli Wei,E-mail:victory_wei@hotmail.com
Last Update: 2022-04-22