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Investigation of in-cylinder gas stratification of diesel engine during intake and compression stroke

Author

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  • Shen, Zhaojie
  • Liu, Zhongchang
  • Tian, Jing
  • Liu, Jiangwei

Abstract

To control diesel emissions of NOx and PM (particular matter), there has been increasing interest in EGR (exhaust gas recirculation) stratification in recent years. However, only a few works have discussed in-cylinder distribution using two-dimensional EGR concentration contour. For a better understanding of in-cylinder stratification, a simulation study following stratified experimental investigation had been conducted to express in-cylinder local and global stratified distribution using OMC (oxygen mass concentration) contour and in-cylinder inhomogeneity. In this work, CO2 gas was selected to substitute for EGR. Two CO2 runners were mounted on tangential and helical intake port of a six-cylinder heavy duty diesel engine and manually controlled using a triple valve. CO2 stratification of supplying CO2 to one of the two intake ports (HelicalCO2 and TangentialCO2) and to both intake ports (BothCO2) has been discussed. The results indicate that HelicalCO2 and BothCO2 obtain high CO2 region at the lower periphery of the combustion chamber, TangentialCO2 obtain the same stratification when CO2 rate is 5%, while high CO2 region at the upper center of the combustion chamber as CO2 rate increasing. In the same way, global distribution from high to low temperature of TangentailCO2 has the highest in-cylinder inhomogeneity when CO2 rate is 5%, while HelicalCO2 becomes higher than other introduction strategies as CO2 rate increasing. Contrary to HelicalCO2 and BothCO2, TangentialCO2 obtains high CO2 at low temperature region when CO2 rate higher than 5%.

Suggested Citation

  • Shen, Zhaojie & Liu, Zhongchang & Tian, Jing & Liu, Jiangwei, 2014. "Investigation of in-cylinder gas stratification of diesel engine during intake and compression stroke," Energy, Elsevier, vol. 72(C), pages 671-679.
    • Handle: RePEc:eee:energy:v:72:y:2014:i:c:p:671-679
    DOI: 10.1016/j.energy.2014.05.094
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    References listed on IDEAS

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    Cited by:

    1. Qiang Liu & Zhongchang Liu & Yongqiang Han & Jing Tian & Jun Wang & Jian Fang, 2018. "Experimental Investigation of the Loading Strategy of an Automotive Diesel Engine under Transient Operation Conditions," Energies, MDPI, vol. 11(5), pages 1-15, May.
    2. Zhaojie Shen & Wenzheng Cui & Xiaodong Ju & Zhongchang Liu & Shaohua Wu & Jianguo Yang, 2017. "Numeric Investigation of Gas Distribution in the Intake Manifold and Intake Ports of a Multi-Cylinder Diesel Engine Refined for Exhaust Gas Stratification," Energies, MDPI, vol. 10(11), pages 1-13, November.
    3. Zhaojie Shen & Wenzheng Cui & Xiaodong Ju & Zhongchang Liu & Shaohua Wu & Jianguo Yang, 2018. "Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection," Energies, MDPI, vol. 11(3), pages 1-14, February.
    4. Lounici, M.S. & Benbellil, M.A. & Loubar, K. & Niculescu, D.C. & Tazerout, M., 2017. "Knock characterization and development of a new knock indicator for dual-fuel engines," Energy, Elsevier, vol. 141(C), pages 2351-2361.
    5. Zhongchang Liu & Xing Yuan & Jing Tian & Yongqiang Han & Runzhao Li & Guanlong Gao, 2018. "Investigation of Sectional-Stage Loading Strategies on a Two-Stage Turbocharged Heavy-Duty Diesel Engine under Transient Operation with EGR," Energies, MDPI, vol. 11(1), pages 1-19, January.
    6. Yousefi, Amin & Birouk, Madjid, 2017. "Investigation of natural gas energy fraction and injection timing on the performance and emissions of a dual-fuel engine with pre-combustion chamber under low engine load," Applied Energy, Elsevier, vol. 189(C), pages 492-505.
    7. Zhang, Wei & Chen, Zhaohui & Duan, Qiwang & Jiang, Qianyu, 2021. "Visual test and evolutionary analysis of flow fields in cylinder of helical intake port diesel engine," Energy, Elsevier, vol. 223(C).

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