预喷策略耦合EGR对氢气/柴油双燃料发动机燃烧和排放性能的影响OA
The influence of pilot strategy coupled with EGR on the combustion and emission performance of hydrogen/diesel dual fuel diesel engine
文章基于一台改造的氢气/柴油双燃料发动机,研究了氢气替代率和预喷策略耦合废气再循环(EGR)方式对其燃烧和排放性能的影响.结果表明:在转速为1 500 r/min,负荷为50%工况下,进气道掺氢的双燃料燃烧模式会导致缸内燃烧压力和放热率峰值增高、NOx 排放量增加、烟灰(SOOT)排放量降低;提前预喷正时和增加预喷油量能够降低 SOOT 排放量,但会增加 NOx 排放量;在预喷策略基础上,将 EGR 率由 22%增加至 32%时,SOOT 排放量逐渐升高但 NOx 排放量大幅减低;在测试工况下,采用预喷策略耦合 EGR 方式,当氢气替代率为6%,预喷正时为-27℃ A,预喷油量为4.6 mg,EGR率为 27%时,发动机的燃烧和排放性能最优.
The effects of hydrogen alternative ratio and pilot injection strategy coupled with EGR on engine performances were studied on a modified hydrogen/diesel dual fuel engine.The results show that under the operating condition of 1 500 r/min engine speed and 50%engine load,cylinder pressure,heat release rate and NOx emission were increased with the increase of hydrogen ratio,while the SOOT emission was decreased with the hydrogen/diesel dual fuel mode.Advancing pilot injection timing and increasing pilot injection quantity can effectively reduce SOOT emissions yet elevate NOx emissions.On the basis of pilot injection strategy,increasing the EGR rate from 22%to 32%,SOOT emissions gradually increase,while NOx emissions are significantly reduced.Under the test condition,the hydrogen/diesel dual fuel engine shows an excellent trade-off relation between NOx and SOOT emissions under the coupled configuration at a hydrogen substitution ratio of 6%,pilot injection timing of-27℃ A,pilot quantity of 4.6 mg and EGR rate is 27%.
孟源;陈晋兵
太原城市职业技术学院 机电工程系,山西 太原 030024||太原理工大学 机械工程学院,山西 太原 030024中国北方发动机研究所,天津 037036
能源科技
氢气/柴油双燃料发动机预喷正时预喷油量EGR率排放特性
hydrogen/diesel dual fuel enginepilot injection timingpilot injection quantityEGR ratioemission characteristics
《可再生能源》 2026 (6)
718-723,6
150kW级高功重比通用航空重油活塞动力研发项目(202201120401018).
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