Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10148969 | Energy Conversion and Management | 2018 | 10 Pages |
Abstract
In Wankel rotary engine (WRE), high mainstream velocity in combustion chamber blocks flame propagating to the end of combustion chamber, which causes high emissions and low combustion efficiency due to unburned mixtures. To solve this problem, a three-dimensional dynamic simulation model of a hydrogen-gasoline blends fueled WRE is built and validated. The in-cylinder mixture formation and combustion process are investigated under different hydrogen injection timing (HIT) and duration (HID) conditions. The study results show that the concentration of hydrogen distributed between the spark plug region and rear combustion chamber increases with retarded HIT and extended HID. Faster flame speeds are obtained for HIT of 110â¯Â°CA BTDC and HID of 40â¯Â°CA. At a fixed HID of 20â¯Â°CA, compared with HITs of 210 and 160â¯Â°CA BTDC, the peak in-cylinder pressures for HIT of 110â¯Â°CA BTDC are increased by 14.3% and 6.8%, respectively. At a fixed HIT of 110â¯Â°CA BTDC, the peak in-cylinder pressure in HID of 40â¯Â°CA is 52.3% and 9.21% higher than HIDs of 20 and 30â¯Â°CA. The highest in-cylinder pressure is achieved with the hydrogen injection strategy that HIT of 110â¯Â°CA BTDC, HID of 40â¯Â°CA. However, as the temperature increases with pressure, nitrogen oxide emissions are also increased with retarded HIT and extended HID obviously. Considering the lowest carbon monoxide is achieved and the unburned zone in the rear region of combustion chamber is eliminated in HIT of 110â¯Â°CA BTDC, HID of 40â¯Â°CA. The hydrogen direct injection strategy that HIT of 110â¯Â°CA BTDC, HID of 40â¯Â°CA acquires the best engine performance in this research.
Keywords
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Physical Sciences and Engineering
Energy
Energy (General)
Authors
Jinxin Yang, Changwei Ji, Shuofeng Wang, Du Wang, Cheng Shi, Zedong Ma, Boya Zhang,