Conventional compression ignition engines can easily be converted to a dual fuel mode of operation using natural gas as main fuel\nand diesel oil injection as pilot to initiate the combustion. At the same time, it is possible to increase the output power by increasing\nthe diesel oil percentage. A detailed performance and combustion characteristic analysis of a heavy duty diesel engine has been\nstudied in dual fuel mode of operation where natural gas is used as the main fuel and diesel oil as pilot. The influence of intake\npressure and temperature on knock occurrence and the effects of initial swirl ratio on heat release rate, temperature-pressure and\nemission levels have been investigated in this study. It is shown that an increase in the initial swirl ratio lengthens the delay period\nfor auto-ignition and extends the combustion period while it reduces NOx. There is an optimum value of the initial swirl ratio\nfor a certain mixture intake temperature and pressure conditions that can achieve high thermal efficiency and low NOx emissions\nwhile decreases the tendency to knock. Simultaneous increase of intake pressure and initial swirl ratio could be the solution to\npower loss and knock in dual fuel engine.
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