Abstract
Split hydrogen direct injection (SHDI) has been proved capable of better efficiency and fewer emissions. Therefore, to investigate SHDI deeply, a numerical study on the effect of second injection timing was presented at a gasoline/hydrogen spark ignition (SI) engine with SHDI. With an excess air ratio of 1.5, five different second injection timings achieved five kinds of hydrogen mixture distribution (HMD), which was the main factor affecting the engine performances. With SHDI, since the HMD is manageable, the engine can achieve better efficiency and fewer emissions. When the second injection timing was 105° crank angle (CA) before top dead center (BTDC), the Pmax was the highest and the position of the Pmax was the earliest. Compared with the single hydrogen direct injection (HDI), the NOX, CO and HC emissions with SHDI were reduced by 20%, 40% and 72% respectively.
Highlights
With the improvement of the world’s industrial level, the consumption of fossil fuels is increasing year by year and the energy crisis is increasingly intensified
The results show that the performance was improved by adding hydrogen, especially under the lean burn condition [4,5]
In [35], we investigated the split injection proportion of Split hydrogen direct injection (SHDI) and found that hydrogen mixture distribution (HMD) is the main factor affecting engine performance
Summary
With the improvement of the world’s industrial level, the consumption of fossil fuels is increasing year by year and the energy crisis is increasingly intensified. The burning of fossil fuels leads to a large number of harmful emissions, such as NOX , HC, PM, etc. How to improve the efficiency of engines and reduce fuel consumption and reduce harmful emissions has become a technical problem for all countries. Efficient and renewable fuels is one of the ways to alleviate the energy crisis and environmental problems. Hydrogen is considered one of the most promising alternatives to fossil fuels because it is widely available and renewable. Hydrogen is more suitable as a kind of blending fuel for the spark ignition (SI) engine
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