雙燃料柴油引擎添加氫氣可降低引擎的污染物生成，因氫氣具有良好的燃燒特性，作為輔助燃料有著許多優點，本文以不同氫氣混合比和不同參數對雙燃料柴油引擎的燃燒與排放物進行分析。
本文針對KUBOTA RK-125 型之單缸直噴式柴油引擎進行數值模擬，以KIVA3V-RELEASE2為程式主體，藉由修改部分副程式及加入詳細化學反應模式，進行數值運算、分析在不同壓縮比及渦流比的參數對氫輔助燃料柴油引擎的影響，並探討在不同引擎轉速及不同比例的預混合氣，引擎所產生的汙染物，包含氮氧化物、二氧化碳、一氧化碳、碳煙濃度及碳煙平均顆粒大小，並將模擬的結果與實驗及文獻比較。
本研究已成功地導入氫輔助燃料引擎污染物模擬分析，並且以詳細化學動力模式取代KIVA3V-RELEASE2原有化學模式。模擬結果顯示，使用輔助燃料氫氣的柴油引擎除了能幫助燃燒且對於污染物的降低確實有效果，以碳氧化物及碳煙造成的效果最顯著，隨著氫氣混合比例的增加將會使燃燒更完全，因而不易產生碳煙和碳氧化物；但需注意比例過高可能會影響引擎性能與污染物的生成量。未來期望本研究的燃燒性能模擬對氫輔助燃料引擎未來發展有參考的價值。

The diesel engine with hydrogen as auxiliary fuel can reduce the formulation of pollutant. Because the hydrogen has good combustion characteristics and many advantages as auxiliary fuels, this study is to analyze the combustion performance and exhaust emissions of a dual fuel engine with premixed ratios and different parameters.
This article is aimed at the KUBOTA RK-125 which is a single cylinder direct injection diesel engine, and carries out the numerical simulation. kIVA3V-RELEASE2 is modified with hydrogen injected at inlet port and implemented by a detailed chemical reaction model. The emissions including nitrogen oxides (NOX), carbon dioxide(CO2), carbon monoxide(CO), soot concentration and soot average particle diameter in a dual fuel engine are calculated under different proportions of intake gas and different engine speeds, and the results between the simulation and the experiment will be compared .
The research has already incorporated the premixed gas - hydrogen simulation successfully in the diesel engine of exhaust emission. The simulation results show that a diesel engine is better with premixed hydrogen than without premixed hydrogen in decreasing exhaust emissions, and the result is conspicuous for the reduction of carbon-monoxide, carbon-dioxide and Soot emission. For the premixed gas, carbon-monoxide, carbon-dioxide, and soot can be reduced by increasing premixed ratio simultaneously, but affecting other emission and engine performance may exist as the added hydrogen proportion is too high. The simulation combustion process in this research is expected to be a reference value for the diesel engine with hydrogen fuel in the future.

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