Study on the Effect of Second Injection Timing on the Engine Performances of a Gasoline/Hydrogen SI Engine with Split Hydrogen Direct Injecting

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 rat...

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Bibliographic Details
Published in:Energies (Basel) 2020-10, Vol.13 (19), p.5223
Main Authors: Li, Guanting, Yu, Xiumin, Sun, Ping, Li, Decheng
Format: Article
Language:English
Subjects:
Chemical reactions
combustion
Efficiency
emission
Emissions
Energy shortages
Gasoline
Hydrogen
hydrogen direct injection
hydrogen mixture distribution
Injection
second injection timing
Spark ignition
split injection
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13195223