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| Research on the Influence of Methanol Substitution Rates on the Combustion and Cycle Fluctuations of Dual-Fuel Engines |
| DOI：10.13949/j.cnki.nrjgc.2022.06.006 |
| Key Words:dual-fuel engine combustion emission cycle fluctuation methanol substitution rate |
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| Abstract:In order to study the effects of different blending ratios of methanol/diesel dual-fuel engines on combustion and cycle fluctuations， experiments with different methanol substitution rates were conducted on a single-cylinder engine modified with a methanol injection system. The results show that with the increase of methanol substation rate， the ignition time in the cylinder is delayed， and the bimodal phenomenon of heat release rate gradually disappears. The peak heat release rate， the maximum explosion pressure， and the maximum pressure rise rate increase. The methanol substitution rate has different effects on the indicated thermal efficiency under different working conditions. The indicated thermal efficiency decreases with the increase of methanol substation rate under low speed while slightly increases under high speed and high load conditions. There are also obvious differences in the impact on emissions under different working conditions. The emission changes are small under low speed and low load conditions， while large under high speed and high load conditions. The research on the influence of methanol substitution rate on the variation of combustion cycle shows that the cyclic variation increases significantly with the increase of methanol substitution rate under low speed and low load. When the methanol substitution rate increases to 28.7%， the cycle fluctuation rate increases by 2.5%， and the distribution of the peak pressure corresponding to the crank angle tends to be dispersed. |
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