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Investigation on the Effect of the Gas Exchange Process on the Diesel Engine Thermal Overload with Experimental Results

Author

Listed:
  • Sangram Kishore Nanda

    (Wärtsilä Services Switzerland Ltd., CH-8401 Winterthur, Switzerland
    Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK)

  • Boru Jia

    (Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK)

  • Andrew Smallbone

    (Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK)

  • Anthony Paul Roskilly

    (Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK)

Abstract

In this paper, the influence of the gas exchange process on the diesel engine thermal overload is provided. Main components involved in the gas exchange process are discussed. The ambient conditions, the turbocharger performance, and the valve timing that affect the gas exchange process have been investigated. Experiments were conducted to simulate ambient conditions at different geographical locations and demonstrated a decrease in oxygen concentration in the exhaust as the humidity level in the air increased. Additionally, the effect of an inefficient turbocharger on an engine operating at part-load was also investigated. It was observed that an overly lean air/fuel mixture caused inefficient scavenging and the corresponding level of residual gas trapped in the cylinder increased. This resulted in partial combustion which could be observed as white smoke from the engine exhaust stack, therefore indicating the presence of unburnt fuel. Exhaust valve timing measurements showed that the cylinder with the highest wear rate had its valve closure timing 10 crank angle degrees after the cylinder with least wear rate. The exhaust valves were closed earlier than the designed condition which impaired the scavenging process and increased the level of residual gas trapped in the cylinder. This resulted in a reduction of the actual air-to-fuel ratio and high exhaust gas temperatures.

Suggested Citation

  • Sangram Kishore Nanda & Boru Jia & Andrew Smallbone & Anthony Paul Roskilly, 2017. "Investigation on the Effect of the Gas Exchange Process on the Diesel Engine Thermal Overload with Experimental Results," Energies, MDPI, vol. 10(6), pages 1-14, May.
  • Handle: RePEc:gam:jeners:v:10:y:2017:i:6:p:766-:d:100123
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    References listed on IDEAS

    as
    1. Cheenkachorn, Kraipat & Poompipatpong, Chedthawut & Ho, Choi Gyeung, 2013. "Performance and emissions of a heavy-duty diesel engine fuelled with diesel and LNG (liquid natural gas)," Energy, Elsevier, vol. 53(C), pages 52-57.
    2. Sangram Kishore Nanda & Boru Jia & Andrew Smallbone & Anthony Paul Roskilly, 2017. "Fundamental Analysis of Thermal Overload in Diesel Engines: Hypothesis and Validation," Energies, MDPI, vol. 10(3), pages 1-12, March.
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    Cited by:

    1. 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.
    2. Sapra, Harsh & Godjevac, Milinko & Visser, Klaas & Stapersma, Douwe & Dijkstra, Chris, 2017. "Experimental and simulation-based investigations of marine diesel engine performance against static back pressure," Applied Energy, Elsevier, vol. 204(C), pages 78-92.
    3. Sangram Kishore Nanda & Boru Jia & Andrew Smallbone & Anthony Paul Roskilly, 2017. "Development of a Diesel Engine Thermal Overload Monitoring System with Applications and Test Results," Energies, MDPI, vol. 10(7), pages 1-13, June.

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