A study on the improvement of combustion and emission performance in an EGR-assisted gasoline engine bi-fueled with hydrogen

다국어 초록 (Multilingual Abstract)

Hydrogen addition to the typical transportation fuel promotes the combustion characteristics in internal combustion engines due to the wide flammability range and the fast flame speed. Lean combustion technology through hydrogen enrichment is expected to be able to satisfy the next generation emission standards and the green house gas regulation. 100% hydrogen is used to investigate the effect of hydrogen addition to a 2 liter gasoline engine equipped with the EGR supply system. The results show that hydrogen addition enables combustion to be stabilized in both lean condition and excess EGR operation. Hydrogen enrichment also reduces the harmful emissions such as nitric oxides (NOx), carbon monoxide (CO), and unburned hydrocarbon (THC) maintaining increased fuel conversion efficiency. Combustion stability is guaranteed through the hydrogen addition in spite of 32% of Exhaust Gas Recirculation (EGR), which ensures more than 90% of NOx reduction. The amount of emitted CO₂, representative green house gas from automobile, was reduced with the increase of hydrogen enhancement. i.e., more than 6%, 14%, 21% of CO₂ reduction rate was observed with the addition of 10%, 20%, 30% hydrogen energy fraction respectively.

목차 (Table of Contents)

• Abstract
• 1. INTRODUCTION
• 2. EXPERIMENT
• 3. RESULTS AND DISCUSSION
• 4. CONCLUSIONS
• References