| 黄粉莲,杨群,王正江,等.甲醇替代率对柴油/甲醇反应活性控制压燃发动机性能的影响[J].内燃机工程,2022,43(1):48-57. |
| 甲醇替代率对柴油/甲醇反应活性控制压燃发动机性能的影响 |
| Effects of Methanol Substitution Rate on Performance of Diesel-Methanol Reactivity Controlled Compression Ignition Engines |
| DOI：10.13949/j.cnki.nrjgc.2022.01.006 |
| 关键词:柴油机 反应活性控制压燃 甲醇 替代率 非常规排放 |
| Key Words:diesel engine reactivity-controlled compression ignition（RCCI） methanol substitution rate non-regulated emission |
| 基金项目:云南省科技计划项目（202103AA080002，2019FB073）；国家自然科学基金项目（52066008） |
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| 摘要:对某4缸高压共轨柴油机进气歧管进行改造，搭建了柴油/甲醇双燃料反应活性控制压燃（reactivity controlled compression ignition， RCCI）发动机专用试验台架，系统地研究了甲醇替代率对发动机经济性和污染物排放的影响规律。结果表明：最大转矩转速1 600 r/min下，负荷率25%~50%范围内甲醇替代率为10%时发动机经济性最佳；50%~100%负荷率范围内随甲醇替代率增大，有效热效率升高，有效当量燃油消耗率降低；100%负荷、30%替代率时，与原机相比，有效热效率提高9.4%，有效当量燃油消耗率降低6.2%。不同负荷工况下，最大甲醇替代率受爆震、失火现象、不完全燃烧及发动机热负荷极限和机械设计强度限制。100%负荷下，随节气门开度减小，最大甲醇替代率从30%提升到36%；甲醇替代率为34%时，有效当量燃油消耗率较原机降低6.5%；高负荷工况下，适当关小节气门开度，减少进气流量，降低缸内最高燃烧压力，可有效提高最大甲醇替代率。外特性工况下，随发动机转速增加，未燃甲醇、非甲烷碳氢化合物、CO2排放降低，甲醛排放先略减少后逐渐增多。同一转速下，随甲醇替代率增加，未燃甲醇和甲醛排放量增加，非甲烷碳氢化合物和CO2排放降低。低碳甲醇/柴油RCCI燃烧模式有利于降低CO2排放。 |
| Abstract:A 4-cylinder high pressure common rail diesel engine test bench was modified to work in reactivity controlled compression ignition （RCCI） combustion mode. The effects of different methanol substitution rate on the performances of a diesel engine operated in methanol/diesel RCCI mode under different conditions were studied. The results show that the best methanol substitution rate is 10% on 25%~50% load at 1 600 r/min. With the increase of methanol substitution rate， the brake specific fuel consumption （BSFC） decreases， and the effective thermal efficiency increases on 50%~100% load. The effective thermal efficiency promoted by 9.4% and the BSFC reduced by 6.2% with 30% methanol substitution rate on 100% load. On different load， the maximum methanol substitution rate was limited by knock， misfire， incomplete combustion， engine thermal load limit and mechanical design strength. On 100% load， the maximum methanol substitution rate increased from 30% to 36% with the throttle valve opening decreased from 100% to 30%， and the BSFC dropped by 6.5% compared with the original engine with 34% methanol. The maximum methanol substitution rate can be effectively improved by properly closing the throttle valve to reduce the intake flow and the maximum pressure in-cylinder at high load conditions. The results of engine full-load characteristics show that with the increase of engine speed， the methanol， non-methane hydrocarbons （NMHC） and carbon dioxide （CO2） emissions decrease gradually， while the emission of formaldehyde （HCHO） decreases slightly and then increases gradually. As the methanol substitution rate rises at the same speed， the emissions of unburned methanol and HCHO increase， while the emissions of NMHC and CO2 reduce. The methanol/diesel dual fuel RCCI combustion strategy is beneficial to reduce CO2 emission. |
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