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The Limit Compression Ratio of Knock Occurring by $R_{dH2}$ in the Heavy Duty Hydrogen-CNG Fueled Engine  

Kim, Yong-Tae (Graduate School of Sungkyunkwan University)
Lee, Jong-Tai (School of Mechanical Engineering, Sungkyunkwan University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.2, 2006 , pp. 84-91 More about this Journal
Abstract
A heavy duty hydrogen-natural gas fueled engine can obtain stable operation at ultra lean conditions and reduce emissions extremely. Reduction of $CO_2$ in its engine is one of the most benefit. In this study, rate of hydrogen addition($R_{dH2}$) and compression ratio($\varepsilon$) were investigated including performance of this engine. As results, it was found that phenomenon of pressure oscillation when increasing $R_{dH2}$ and $\varepsilon$, it means occurring knock. It consider that pressure oscillation was increased due to fast burning speed of hydrogen. Even if same compression ratio, pressure oscillation was remarkable increased according to increasing $R_{dH2}$. Therefore, limit compression ratio of knock occurring was reduced by increasing $R_{dH2}$.
Keywords
Hydrogen-natural gas fueled engine; Ultra lean condition; Rate of hydrogen addition($R_{dH2}$); Compression ratio; Pressure oscillation; Limit compression ratio of knock occurring;
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