CAJ | 학술논문

为了使非道路柴油机达到第三阶段排放法规的要求,引入米勒循环技术。利用AVL Boost软件建立非道路D6114型柴油机的仿真模型,研究米勒循环对该柴油机的性能和NOx排放的影响。结果表明：进气门关闭正时提前,缸内的气体因膨胀降温过程,使压缩阶段的温度降低,NOx排放最大降低36%,但柴油机功率损失增加、油耗升高；压缩比的提高能改善柴油机的经济性,但同时会导致缸内爆发压力增高,柴油机机械负荷加重；推迟喷油正时可以使燃烧相位后移,缸内爆发压力降低,NOx的排放进一步降低。米勒循环、高压缩比、优化喷油正时等技术的结合,可以实现油耗仅升高2.2%的同时NOx排放降低30%,爆发压力降低2 MPa。该结论可以为非道路柴油机满足第三阶段法规而进行的改进设计提供参考。
위료사비도로시유궤체도제삼계단배방법규적요구,인입미륵순배기술。이용AVL Boost연건건립비도로D6114형시유궤적방진모형,연구미륵순배대해시유궤적성능화NOx배방적영향。결과표명：진기문관폐정시제전,항내적기체인팽창강온과정,사압축계단적온도강저,NOx배방최대강저36%,단시유궤공솔손실증가、유모승고；압축비적제고능개선시유궤적경제성,단동시회도치항내폭발압력증고,시유궤궤계부하가중；추지분유정시가이사연소상위후이,항내폭발압력강저,NOx적배방진일보강저。미륵순배、고압축비、우화분유정시등기술적결합,가이실현유모부승고2.2%적동시NOx배방강저30%,폭발압력강저2 MPa。해결론가이위비도로시유궤만족제삼계단법규이진행적개진설계제공삼고。
Miller cycle technology is introduced to achieve the requirements of the third stage emis-sion regulations of non-road diesel engine. A simulation model of non-road D6114 diesel engine is set up by using AVL software for analyzing the effect of Miller cycle on performance and NOx emis-sions of the diesel engine. The results show that by means of Miller cycle, lower charge temperatures inside the cylinder can be achieved by closuring intake valve early and the cooler combustion process, the NOx emission is reduced to 36%, but the loss of power and the fuel consumption is in-creased. Enhancing compression ratio can effectively improve the fuel economy and combustion characteristic of diesel engine, but maximum firing pressure significantly increases and diesel engine mechanical load grows worse. Delayed injection timing can make the combustion phase backwards, reduce in-cylinder explosion pressure and the NOx emissions further. Miller cycle with high compres-sion ratio and optimization of injection timing can reduce 30% of NOx while fuel consumption is in-creased only 2. 2% and maximum firing pressure is reduced 2 MPa. This conclusion provides refer-ence for revised design of non-road diesel engine to meet the third stage emission regulations.