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| Numerical Study on High-Pressure Direct Injection Combustion Characteristics of Ammonia/Dimethyl Ether Dual Fuel |
| DOI：10.13949/j.cnki.nrjgc.2024.04.003 |
| Key Words:ammonia dimethyl ether（DME） combustion high-pressure direct injection pilot ignition NOx |
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| Abstract:Using CONVERGE software， the high-pressure spray process of liquid NH3 and dimethyl ether（DME） liquid fuel were numerically simulated and verified against experimental data from literature， and then the high-pressure direct injection combustion process of liquid NH3/DME dual fuel was numerically investigated. The effects of the nozzle positions， injection strategies， and ammonia energy ratios and other factors on the ignition and combustion characteristics were explored. The results show that reasonable distance of fuel nozzles can effectively promote the combustion of ammonia. But if the distance is too close， DME spray will be strongly affected by the temperature drop of ammonia evaporation， resulting in misfire. Compared with the injection sequence of liquid NH3–DME， the strategy of injecting DME before liquid NH3 can promote the combustion efficiency of NH3 with high NH3 energy ratios. During the combustion process， nitric oxide （NO） and nitrogen dioxide （NO2） are formed in the high temperature region and the medium low temperature region， respectively. When the injection interval between DME and NH3 is increased from 0.5 ms to 1.0 ms， the NO and NO2 formation is reduced. And when the proportion of ammonia energy is reduced from 80% to 50%， the production of NO and NO2 would increase. |
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