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Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

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  • Zhang, Qiang
  • Li, Menghan
  • Shao, Sidong

Abstract

In this paper, the combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel were experimentally explored. The experiments were carried out under two operating points (A:1275rpm BMEP 1.05MPa, B:1550rpm BMEP 1.05MPa) with diesel rail pressure (DRP) varied from 18MPa to 30MPa and start of natural gas injection (NSOI) in the range of 1°BTDC to 19°BTDC. Based on the experimental results, as the injection timing advances, the maximum in-cylinder pressure and NOx emissions increase, the flame development duration and brake specific fuel consumption (BSFC) decrease, the maximum heat release rate shows a trend of first decrease and then increase while the changing trend for carbon monoxide (CO) emissions is first increase and then decrease; as the injection pressure raises, the combustion process takes place earlier, causing negative effects on nitrogen oxides (NOx) emissions; with higher engine speed, however, the combustion events are delayed, leading to lower peak value of heat release rate, improved CO and NOx emissions, impaired total hydrocarbon (THC) emissions and higher BSFC.

Suggested Citation

  • Zhang, Qiang & Li, Menghan & Shao, Sidong, 2015. "Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel," Applied Energy, Elsevier, vol. 157(C), pages 217-228.
    • Handle: RePEc:eee:appene:v:157:y:2015:i:c:p:217-228
    DOI: 10.1016/j.apenergy.2015.08.021
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