Abstract
<div class="section abstract"><div class="htmlview paragraph">The use of hydrogen produced from renewable energy sources is expected to be one of the most promising options for achieving carbon neutrality in automobiles, in addition to electrification and the use of biofuels and synthetic fuels. In recent years, along with fuel cell electric vehicles (FCEVs), there has been renewed interest in hydrogen engines that can utilize internal combustion engine technology. Although hydrogen has the property of a high laminar burning velocity and a wide flammable range compared to other fuels, the actual combustion phenomenon in a real engine is strongly influenced by the turbulence created by the in- cylinder flow and the distribution of fuel and air in the cylinder due to the formation of the mixture. Therefore, to fully utilize hydrogen as a fuel in actual engines and bring out its performance, it is important to understand the basic combustion characteristics of hydrogen in the cylinder and the effects of these factors on hydrogen combustion. In this paper, we analyzed the basic combustion characteristics of hydrogen using actual engines under conditions that consider its use in automobiles and investigated the effect of turbulence on hydrogen combustion characteristics in the cylinder. Based on these results, we discuss improvements to the potential of hydrogen engines.</div></div>
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