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This study investigates the dual fuel operation of a diesel-hydrogen blend in a compression ignition (CI) engine. Conventional diesel is selected as the high reactivity fuel (HRF), while hydrogen is the low reactivity fuel (LRF). The experimental analysis focused on varying fuel injection timings and hydrogen premix ratios for better engine performance while simultaneously reducing emissions. The data indicate that advancing HRF injection timing enhances air-fuel uniformity, improving combustion efficiency. The maximum BTE of 37.75% was recorded at HRF injection of 70°bTDC and a 40% hydrogen premix ratio. Concurrently, the oxides of nitrogen, hydrocarbons, carbon monoxide, and smoke emissions are reduced significantly compared to conventional diesel operations. However, excessive advancement of HRF injection timing (90°bTDC) resulted in deteriorated combustion quality due to crevice fuel entrapment. These findings underscore the potential of hydrogen-enriched dual-fuel operation in CI engines for achieving cleaner combustion and improved performance while mitigating carbon-based emissions.

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Effect of Premix Ratio on Performance, Combustion, and Emission of Hydrogen RCCI Engine

  • 会议论文

  • 发表日期：

    2026年

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  • Divyansh Singh,
  • Sunayana Saikia,
  • Parthasarathi Deb,
  • Abhishek Paul

摘要

This study investigates the dual fuel operation of a diesel-hydrogen blend in a compression ignition (CI) engine. Conventional diesel is selected as the high reactivity fuel (HRF), while hydrogen is the low reactivity fuel (LRF). The experimental analysis focused on varying fuel injection timings and hydrogen premix ratios for better engine performance while simultaneously reducing emissions. The data indicate that advancing HRF injection timing enhances air-fuel uniformity, improving combustion efficiency. The maximum BTE of 37.75% was recorded at HRF injection of 70°bTDC and a 40% hydrogen premix ratio. Concurrently, the oxides of nitrogen, hydrocarbons, carbon monoxide, and smoke emissions are reduced significantly compared to conventional diesel operations. However, excessive advancement of HRF injection timing (90°bTDC) resulted in deteriorated combustion quality due to crevice fuel entrapment. These findings underscore the potential of hydrogen-enriched dual-fuel operation in CI engines for achieving cleaner combustion and improved performance while mitigating carbon-based emissions.