Effects of hydrocarbon compositions on raw exhaust emissions and combustion processes were studied on an engine test bench.The optimization of gasoline hydrocarbon composition was discussed.As olefins content increased from 10.0%to 25.0%in volume,the combustion duration was shortened by about 2 degree crank angle(°CA),and the engine-out THC emission was reduced by about 15%. On the other hand,as aromatics content changed from 35.0%to 45.0%,the engine-out NOx emissions increased by 4%.An increment in olefins content resulted in a slight increase in engine-out CO emission,while the aromatics content had little effect on engine-out total hydrocarbon(THC)and CO emissions.Over the new European driving cycle(NEDC),the THC,NOx and CO emissions of fuel with 25.0%olefins and 35.0%aromatics were about 45%,21%and 19%lower than those of fuel with 10.0%olefins and 40.0%aromatics,respectively.The optimized gasoline compositions for new engines and new vehicles have low aromatics and high olefins contents.
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机译:Optimization of Medium Composition for Antibacterial Substance Production by Aspergillus niger xj using Response Surface MethodologyAU Li, Zhu (zhuliluck@163.com) Liu, Song Song, Yuan Liu, Wu-Juan Chen, Xue Wang, Qiang Ge, Yong-Yi Shi, Miao-Xiao Jin, Yi