| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系 === 106 === This study presents experimental examinations of a common-rail single-cylinder diesel engine, mixing three different kind of alcohols by pre-mixed the diesel with the same percentage heat value of alcohols which include Methanol、1-Butanol and 1-Octanol expecting that will not only increase the fuel to contain more oxygen but alter the fuels chemical and physical properties to improve combustion efficiency. And also explore the potentiality of alcohols to become an alternative fuels. This experiment focused on the measurement of torque and pollution emissions which contains CO、HC、CO2、NOX and Smoke. The results of the examinations witch using pure diesel fuel were be the base-line for this experiment. This study were used a single cylinder diesel engine CY 190 at various engine speed (1500rpm、1800rpm、2100rpm、2400rpm) and various energy value injection that define by the pure diesel at the engine equivalence ratio (Φd=0.2、0.3、0.4). The experiment were constant the injection timing at top dead center 19°CA and the fuel injection pressure is 500 bar.
The result shows that it’s positive for the engine performance at non-high engine speed for all three kind of diesel/alcohols blends. It’s due to the alcohols containing more oxygen that cloud improve the combustion rate. At the emissions way, low engine speed would cause the HC、CO、Smoke emission increase, but the emissions decreased by increasing the engine speed till 2100rpm. The emission of NOX were depend on the type of additives, the diesel/Methanol blend compare to the base-line had a lower NOX emission at all condition, the diesel/1-Butanol blend and diesel/1-Octanol blend has a similar pattern of NOX emission.
As the result we could find out that adding alcohols could increase the fuels oxygen containing rate to improve the combustion efficiency, but sort-chain alcohols has a lower CN value and higher Heat of Vaporization that were make the ignition timing late, cause a higher emissions. Conclude all the measure value, it has a best engine performance increase and emission reduce at 2100rpm with mid and high load.
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