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Influence of exhaust gas recirculation on low-load diesel engine performance

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Wuhan University Journal of Natural Sciences

Abstract

In the condition of constant speed and light load, an experimental study of a turbocharged and intercooled diesel engine with exhaust gas recirculation (EGR) system focuses on the influence of different EGR rates on combustion process, dynamic performance, economic performance and emission performance of a diesel engine. With the increase of EGR rate, the oxygen concentration of the intake-side decreases, the fuel air equivalence ratio increases, and the maximum explosion pressure in the cylinder decreases. Meanwhile, the average temperature in the cylinder drops, the ignition delay is prolonged, the ignition timing delays, and the maximum heat release rate decreases. The increase of EGR rate makes NOx emissions decrease obviously and continue to decline. When EGR is low, the smoke rate enlarges slowly with the increase of EGR rate, and enlarges greatly at the rate higher than 43% and reaches the maximum at the rate of 57%. When EGR rate is higher than 61%, the smoke rate drops rapidly, and the content of CO and hydrocarbon (HC) increases rapidly with high EGR rate.

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Authors and Affiliations

  1. School of Automotive Engineering, Jiangxi University of Technology, Nanchang, Jiangxi, 330098, China

    Wenming Cheng & Xing Yi

  2. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China

    Wenming Cheng & Xianghu Li

Authors
  1. Wenming Cheng
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  2. Xianghu Li
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  3. Xing Yi
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Correspondence to Wenming Cheng.

Additional information

Foundation item: Supported by the Major Plan Projects of Science and Technology of Jiangxi Provincial Department of Education (GJJ151145), the Youth Science Fund Project Science and Technology of Jiangxi Provincial Department of Science and Technology (20114BAB216002), and the Plan Projects of Science and Technology of Jiangxi Provincial Department of Science and Technology (2016BBE50074)

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Cheng, W., Li, X. & Yi, X. Influence of exhaust gas recirculation on low-load diesel engine performance. Wuhan Univ. J. Nat. Sci. 22, 443–448 (2017). https://doi.org/10.1007/s11859-017-1270-1

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  • DOI: https://doi.org/10.1007/s11859-017-1270-1

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