Abstract
In this paper, the simulation model was established based on GT-Power software, and a scheme using the Miller cycle based on biodiesel was proposed. Taking diesel engine 16V265H as the research object, the accuracy of the simulation model was verified by experiments. Combined with the comparison of physical and chemical characteristics of biodiesel and the experimental analysis of biodiesel under three different combinations, it was concluded that low ratio biodiesel was the best choice to meet the power, economy, and emission performance of diesel. Through the simulation scheme of the two Miller cycles for pure diesel (B0) and biodiesel (B10) under different load conditions at 1000 rpm, the NOx emission performance of pure diesel in a Miller cycle was significantly improved. On this basis, the comprehensive performance of the two Miller cycles was compared with biodiesel. The results showed that both the Miller cycles could reduce NOx emission. Combined with other key performances of a diesel engine, the best scheme to improve the performance of the diesel engine was to burn B10 biodiesel and overlap angle the Miller cycle of the variable valve at 30 °CA. The scheme has guiding significance for the application of the 16V265H diesel engine.
Highlights
Academic Editor: Jiaqiang ESince the beginning of the 21st century, the global transportation industry has developed rapidly, especially rail transportation
The results showed that the Miller cycle did reduce nitrogen oxide (NOx) emission to a certain extent
This paper studies the influence of biodiesel on the performance of locomotive diesel engines through two different Miller cycle modes of variable cam profile and variable valve overlap angle, compares the effects of the two Miller cycle modes and selects the better Miller cycle implementation mode
Summary
Since the beginning of the 21st century, the global transportation industry has developed rapidly, especially rail transportation. The Miller cycle is to close the intake valve at a certain angle before the bottom dead center, and the gas entering the cylinder during the intake stroke will obtain an additional expansion during the downward movement of the piston In this process, the additional expanded gas will reduce the temperature in the cylinder, reduce the average temperature in the cylinder before combustion, and effectively reduce NOx emission. This paper studies the influence of biodiesel on the performance of locomotive diesel engines through two different Miller cycle modes of variable cam profile and variable valve overlap angle, compares the effects of the two Miller cycle modes and selects the better Miller cycle implementation mode. The power, economy, and emission performance of the simulated diesel engine are optimized by burning biodiesel under the conditions of the two Miller cycles [31]. This study will provide a method reference for the followup research work of the Miller cycle, and its research results have certain engineering application value
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