CAJ | 학술논문

采用并联式布置文丘里管实现非道路用柴油机废气再循环（EGR）,从而降低NOx的排放,并利用GT-POWER软件建立相应的数学模型,模拟喷油提前角和文丘里管系统的旁通阀开闭情况对柴油机放热率和NOx排放的影响。试验和模拟结果表明,在非道路用柴油机上以并联式布置文丘里管后,其排放值能满足欧ⅢA标准;在大负荷开启文丘里管系统的旁通阀时,进气量有所增加,缸压增加,而NOx排放变化不大;在中小负荷开启文丘里管系统的旁通阀时,缸压增加但NOx排放也增加,此时适当推迟喷油能得到缸压和NOx排放的双重改善。
채용병련식포치문구리관실현비도로용시유궤폐기재순배（EGR）,종이강저NOx적배방,병이용GT-POWER연건건립상응적수학모형,모의분유제전각화문구리관계통적방통벌개폐정황대시유궤방열솔화NOx배방적영향。시험화모의결과표명,재비도로용시유궤상이병련식포치문구리관후,기배방치능만족구ⅢA표준;재대부하개계문구리관계통적방통벌시,진기량유소증가,항압증가,이NOx배방변화불대;재중소부하개계문구리관계통적방통벌시,항압증가단NOx배방야증가,차시괄당추지분유능득도항압화NOx배방적쌍중개선。
The parallel-connected type venturi tube was used for non-road mobile machinery（NRMM） to achieve exhaust gas recirculation（EGR） which can reduce the NOx emission,and simulation model was built by using GT-POWER software to simulate the effect of injection advanced angle and bypass valve of venturi tube on heat release rate and NOx emission.The experiment and simulation results show that the non-road mobile machinery equipped with parallel-connected type venturi tube can attain EuroⅢA emission standard;opening the bypass valve under heavy load can increase the intake flow and the peak in-cylinder pressure while the NOx emission does not increase;under middle load opening the bypass valve can increase the peak in-cylinder pressure but also increase the NOx emission,delaying the injection time appropriately can get double improvement about the in-cylinder pressure and NOx emission.