numerical and experimental investigation of combustion and knock in a dual fuel gas/diesel compression ignition engine
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ID: 259146
2012
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Abstract
Conventional compression ignition engines can easily be converted to a dual fuel mode of operation using natural gas as main fuel and diesel oil injection as pilot to initiate the combustion. At the same time, it is possible to increase the output power by increasing the diesel oil percentage. A detailed performance and combustion characteristic analysis of a heavy duty diesel engine has been studied in dual fuel mode of operation where natural gas is used as the main fuel and diesel oil as pilot. The influence of intake pressure and temperature on knock occurrence and the effects of initial swirl ratio on heat release rate, temperature-pressure and emission levels have been investigated in this study. It is shown that an increase in the initial swirl ratio lengthens the delay period for auto-ignition and extends the combustion period while it reduces NOx. There is an optimum value of the initial swirl ratio for a certain mixture intake temperature and pressure conditions that can achieve high thermal efficiency and low NOx emissions while decreases the tendency to knock. Simultaneous increase of intake pressure and initial swirl ratio could be the solution to power loss and knock in dual fuel engine.
| Reference Key |
gharehghani2012journalnumerical
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|---|---|
| Authors | ;A. Gharehghani;S. M. Mirsalim;S. A. Jazayeri |
| Journal | journal of neuroscience methods |
| Year | 2012 |
| DOI |
10.1155/2012/504590
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