车用发动机
車用髮動機
차용발동궤
2014年
4期
73-77,88
,共6页
朱睿%孙万臣%杜家坤%李鲁宁%李国良%李文祥
硃睿%孫萬臣%杜傢坤%李魯寧%李國良%李文祥
주예%손만신%두가곤%리로저%리국량%리문상
高压共轨%重型柴油机%二级增压%废气再循环%燃烧%排放
高壓共軌%重型柴油機%二級增壓%廢氣再循環%燃燒%排放
고압공궤%중형시유궤%이급증압%폐기재순배%연소%배방
high-pressure common rail%heavy duty diesel engine%two-stage turbocharging%EGR%combustion%emission
针对某电控高压共轨重型柴油机,研究了二级增压及EGR系统对燃烧、排放及动力性能的影响规律。研究结果表明,相同EGR率下,二级增压柴油机CO ,HC和炭烟排放均低于单级增压,且随EGR率增大,缸内燃烧压力、放热率峰值及缸内平均温度均有所降低,滞燃期变化不大。相比单级增压,二级增压能够实现更大的 EGR率,在更宽的EGR率范围内保持发动机良好的动力性和经济性;随EGR率增大,EGR对二级增压柴油机NO x 排放的抑制效果更为明显,且能够在更宽的EGR率范围内维持较低的炭烟排放;NO x 与燃油消耗率和烟度的平衡关系也明显优于单级增压。
針對某電控高壓共軌重型柴油機,研究瞭二級增壓及EGR繫統對燃燒、排放及動力性能的影響規律。研究結果錶明,相同EGR率下,二級增壓柴油機CO ,HC和炭煙排放均低于單級增壓,且隨EGR率增大,缸內燃燒壓力、放熱率峰值及缸內平均溫度均有所降低,滯燃期變化不大。相比單級增壓,二級增壓能夠實現更大的 EGR率,在更寬的EGR率範圍內保持髮動機良好的動力性和經濟性;隨EGR率增大,EGR對二級增壓柴油機NO x 排放的抑製效果更為明顯,且能夠在更寬的EGR率範圍內維持較低的炭煙排放;NO x 與燃油消耗率和煙度的平衡關繫也明顯優于單級增壓。
침대모전공고압공궤중형시유궤,연구료이급증압급EGR계통대연소、배방급동력성능적영향규률。연구결과표명,상동EGR솔하,이급증압시유궤CO ,HC화탄연배방균저우단급증압,차수EGR솔증대,항내연소압력、방열솔봉치급항내평균온도균유소강저,체연기변화불대。상비단급증압,이급증압능구실현경대적 EGR솔,재경관적EGR솔범위내보지발동궤량호적동력성화경제성;수EGR솔증대,EGR대이급증압시유궤NO x 배방적억제효과경위명현,차능구재경관적EGR솔범위내유지교저적탄연배방;NO x 여연유소모솔화연도적평형관계야명현우우단급증압。
The effect of EGR and two-stage turbocharging on combustion ,emission and power performance was investigated on a electronic control high-pressure common rail heavy duty engine .The result shows that the CO ,HC and soot emissions of two-stage turbocharged diesel engine are lower than the original under the same EGR rate .With the increase of EGR rate ,the maximum in-cylinder pressure ,the peak heat release rate and the in-cylinder average combustion temperature decrease and the ignition delay period almost keeps unchanged .Compared with the original engine ,two-stage turbocharged engine can achieve the higher EGR rate and can keep good power and economy performance in a wider range of EGR rate .With the increase of EGR rate ,the inhibition NOx emissions become more obvious and the lower soot emissions can be maintained in a wide range of EGR rate .The compromise between NOx emission and fuel consumption rate as well as soot emission is also significantly better than the single-stage turbocharged engine .