CAJ | 학술논문

在一台六缸柴油机上搭建了进气喷射甲醇掺烧系统，对不同替代率下的柴油掺烧甲醇工况燃烧和排放特性进行了试验研究。试验结果表明：掺烧甲醇改变了发动机的燃烧特性。随甲醇替代率的上升，预混合燃烧比例逐渐增大，扩散燃烧比例则减小。掺烧甲醇后，缩短了整体工况的燃烧持续期，使放热更加集中，改善了燃烧等容度。掺烧甲醇还会从散热系统回收一部分热量，共同作用下使热效率得到大幅提高。但大比例掺烧甲醇也会对NOx及CO排放带来恶化，并生成甲醇与甲醛等非常规排放物。同时掺烧甲醇还会延长滞燃期，因此需要调整柴油的主喷正时以保证发动机运转稳定。
재일태륙항시유궤상탑건료진기분사갑순참소계통，대불동체대솔하적시유참소갑순공황연소화배방특성진행료시험연구。시험결과표명：참소갑순개변료발동궤적연소특성。수갑순체대솔적상승，예혼합연소비례축점증대，확산연소비례칙감소。참소갑순후，축단료정체공황적연소지속기，사방열경가집중，개선료연소등용도。참소갑순환회종산열계통회수일부분열량，공동작용하사열효솔득도대폭제고。단대비례참소갑순야회대NOx급CO배방대래악화，병생성갑순여갑철등비상규배방물。동시참소갑순환회연장체연기，인차수요조정시유적주분정시이보증발동궤운전은정。
An inlet injection system of methanol was built in a six cylinder diesel engine to investigate the combustion and emission characteristics at different substitution rates under the condition of diesel/methanol compound. The test results show that the combustion characteristics of the engine has changed with the methanol compound combustion. With the methanol replacement rate increases, the premixed combustion ratio increases and the diffusion combustion ratio decreases. With the methanol compound combustion, the overal combustion duration shortened, heat is more focused and improve the combustion content. The methanol compound combustion can also recover a part of heat from the cooling system, together with the joint effect of the heat efifciency is greatly improved. However, the high methanol replacement rate wil bring the deterioration of the NOx and CO emissions with the methanol and formaldehyde emissions. The methanol compound combustion wil also delay the cylinder starts burning time, it is have to adjust the main injection timing to ensure the stable operation of the engine.