4.6 Article

Experimental Study on the Effects of Hydrogen Injection Strategy on the Combustion and Emissions of a Hydrogen/Gasoline Dual Fuel SI Engine under Lean Burn Condition

Journal

APPLIED SCIENCES-BASEL
Volume 12, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/app122010549

Keywords

dual-fuel engine; hydrogen injection strategy; lean burn limit; hydrogen mixture distribution; combustion; emissions

Funding

  1. Nationa lNatural Science Foundation of China [51876163]
  2. Shaanxi Science and Technology Innovation Team [2021TD-22]
  3. Major Science and Technology Projects of Inner Mongolia Autonomous Region [2021ZD0021]

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Hydrogen addition improves engine performance and extends the lean burn limit. Different hydrogen injection strategies result in different hydrogen mixture distributions, affecting engine performance and emissions. Hydrogen addition enhances ignition and combustion stability, reducing emissions.
Hydrogen addition can improve the performance and extend the lean burn limit of gasoline engines. Different hydrogen injection strategies lead to different types of hydrogen mixture distribution (HMD), which affects the engine performance. Therefore, the present study experimentally investigated the effects of hydrogen injection strategy on the combustion and emissions of a hydrogen/gasoline dual-fuel port-injection engine under lean-burn conditions. Four different hydrogen injection strategies were explored: hydrogen direct injection (HDI), forming a stratified hydrogen mixture distribution (SHMD); hydrogen intake port injection, forming a premixed hydrogen mixture distribution (PHMD); split hydrogen direct injection (SHDI), forming a partially premixed hydrogen mixture distribution (PPHMD); and no hydrogen addition (NHMD). The results showed that 20% hydrogen addition could extend the lean burn limit from 1.5 to 2.8. With the increase in the excess air ratio, the optimum HMD changed from PPHMD to SHMD. The maximum brake thermal efficiency was obtained with an excess air ratio of 1.5 with PPHMD. The coefficient of variation (COV) with NHMD was higher than that with hydrogen addition, since the hydrogen enhanced the stability of ignition and combustion. The engine presented the lowest emissions with PHMD. There were almost no carbon monoxide (CO) and nitrogen oxides (NOx) emissions when the excess air ratio was, respectively, more than 1.4 and 2.0.

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