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<p>Homogeneous charge compression ignition (HCCI) combustion is considered a promising low-temperature combustion strategy for reducing nitrogen oxide and soot emissions from diesel engines. In this study, the combined effect of low-carbon fuels, compressed biogas (CBG) and dimethyl ether (DME), on combustion, performance, and emission characteristics of a modified CRDI diesel engine operated in HCCI mode was experimentally investigated. The fuels were supplied through port fuel injection with different energy share ratios of 91% CBG–9% DME, 87% CBG–13% DME, and 77% CBG–23% DME under low-load conditions. In addition, exhaust gas recirculation (EGR) varied from 2% to 29% to control combustion phasing. The results show that the 91% CBG-9% DME blend achieved the most stable combustion, exhibiting higher in- cylinder pressure and heat release rate compared to other blends. this optimal mixture enhanced indicated mean effective pressure and thermal efficiency due to improved combustion phasing and stronger premixed combustion. However, increasing the DME proportion beyond 13% caused excessive advancement of combustion, which led to a deadline in thermal efficiency. the use of EGR further refined combustion timing, lowered peak combustion temperature, and enabled significant emission reduction. under these conditions, NOx emissions were reduced by nearly 59% without EGR, accompanied by only a slight increase in Unburned hydrocarbons. moreover, Dual- fuel operation resulted in lower smoke and CO2 emissions compare to conventional diesel combustion. overall, the finding confirms that combining CBG and DME with optimized EGR promotes stable low- temperature combustion and improved emission characteristics, demonstrating the potential of low- carbon gaseous fuel for sustainable HCCI engine operation. This investigation will provide guidelines for prospective research. This suggests that low carbon fuel like DME and CBG are promising alternative to traditional fossil fuels, offering both environmental efficiency benefits.</p>

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The combined effect of low carbon fuels dme and cbg in homogeneous charge compression ignition engine

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Sivakumar Sivalingam,
  • Ganesh Duraisamy,
  • V. Charles Augustin

摘要

Homogeneous charge compression ignition (HCCI) combustion is considered a promising low-temperature combustion strategy for reducing nitrogen oxide and soot emissions from diesel engines. In this study, the combined effect of low-carbon fuels, compressed biogas (CBG) and dimethyl ether (DME), on combustion, performance, and emission characteristics of a modified CRDI diesel engine operated in HCCI mode was experimentally investigated. The fuels were supplied through port fuel injection with different energy share ratios of 91% CBG–9% DME, 87% CBG–13% DME, and 77% CBG–23% DME under low-load conditions. In addition, exhaust gas recirculation (EGR) varied from 2% to 29% to control combustion phasing. The results show that the 91% CBG-9% DME blend achieved the most stable combustion, exhibiting higher in- cylinder pressure and heat release rate compared to other blends. this optimal mixture enhanced indicated mean effective pressure and thermal efficiency due to improved combustion phasing and stronger premixed combustion. However, increasing the DME proportion beyond 13% caused excessive advancement of combustion, which led to a deadline in thermal efficiency. the use of EGR further refined combustion timing, lowered peak combustion temperature, and enabled significant emission reduction. under these conditions, NOx emissions were reduced by nearly 59% without EGR, accompanied by only a slight increase in Unburned hydrocarbons. moreover, Dual- fuel operation resulted in lower smoke and CO2 emissions compare to conventional diesel combustion. overall, the finding confirms that combining CBG and DME with optimized EGR promotes stable low- temperature combustion and improved emission characteristics, demonstrating the potential of low- carbon gaseous fuel for sustainable HCCI engine operation. This investigation will provide guidelines for prospective research. This suggests that low carbon fuel like DME and CBG are promising alternative to traditional fossil fuels, offering both environmental efficiency benefits.