Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine
Premixed combustion mode dual-fuel (DF) engines are widely used in large-bore marine engines due to their great potential to solve the problem of CO<sub>2</sub> emissions. However, detonation is one of the main problems in the development of marine engines based on the premixed combustio...
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MDPI AG
2022-09-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/13/9/1528 |
| _version_ | 1797491298506113024 |
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| author | Long Liu Shihai Liu Qian Xia Bo Liu Xiuzhen Ma |
| author_facet | Long Liu Shihai Liu Qian Xia Bo Liu Xiuzhen Ma |
| author_sort | Long Liu |
| collection | DOAJ |
| description | Premixed combustion mode dual-fuel (DF) engines are widely used in large-bore marine engines due to their great potential to solve the problem of CO<sub>2</sub> emissions. However, detonation is one of the main problems in the development of marine engines based on the premixed combustion mode, which affects the popularization of liquefied natural gas (LNG) engines. Due to the large bore and long stroke, marine dual-fuel engines have unique flow characteristics and a mixture mechanism of natural gas and air. Therefore, the purpose of this study is to present a simulated investigation on the influence of swirl on multiscale mixing and the concentration field, which provides a new supplement for mass transfer theory and engineering applications. It is suggested that the phenomenon of abnormal combustion occurs on account of the distribution of the mixture being uneven in a super-large-bore dual-fuel engine. Further analysis showed that the level of swirl at the late compression stage and the turbulence intensity are the decisive factors affecting the transmission process of natural gas (NG) and distribution of methane (CH<sub>4</sub>) concentration. Finally, a strategy of improving mixture quality and the distribution of the mixture was proposed. |
| first_indexed | 2024-03-10T00:45:29Z |
| format | Article |
| id | doaj.art-c806a3dfd75a486d826c7ff37fd62118 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T00:45:29Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
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| series | Atmosphere |
| spelling | doaj.art-c806a3dfd75a486d826c7ff37fd621182023-11-23T15:01:05ZengMDPI AGAtmosphere2073-44332022-09-01139152810.3390/atmos13091528Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine EngineLong Liu0Shihai Liu1Qian Xia2Bo Liu3Xiuzhen Ma4College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, ChinaChina Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 201208, ChinaChina Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 201208, ChinaCollege of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, ChinaPremixed combustion mode dual-fuel (DF) engines are widely used in large-bore marine engines due to their great potential to solve the problem of CO<sub>2</sub> emissions. However, detonation is one of the main problems in the development of marine engines based on the premixed combustion mode, which affects the popularization of liquefied natural gas (LNG) engines. Due to the large bore and long stroke, marine dual-fuel engines have unique flow characteristics and a mixture mechanism of natural gas and air. Therefore, the purpose of this study is to present a simulated investigation on the influence of swirl on multiscale mixing and the concentration field, which provides a new supplement for mass transfer theory and engineering applications. It is suggested that the phenomenon of abnormal combustion occurs on account of the distribution of the mixture being uneven in a super-large-bore dual-fuel engine. Further analysis showed that the level of swirl at the late compression stage and the turbulence intensity are the decisive factors affecting the transmission process of natural gas (NG) and distribution of methane (CH<sub>4</sub>) concentration. Finally, a strategy of improving mixture quality and the distribution of the mixture was proposed.https://www.mdpi.com/2073-4433/13/9/1528natural gas/air mixinglarge-bore dual-fuel enginelow-speedswirl ratiocomputational fluid dynamics |
| spellingShingle | Long Liu Shihai Liu Qian Xia Bo Liu Xiuzhen Ma Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine Atmosphere natural gas/air mixing large-bore dual-fuel engine low-speed swirl ratio computational fluid dynamics |
| title | Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine |
| title_full | Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine |
| title_fullStr | Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine |
| title_full_unstemmed | Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine |
| title_short | Numerical Investigation on Mixing Characteristics and Mechanism of Natural Gas/Air in a Super-Large-Bore Dual-Fuel Marine Engine |
| title_sort | numerical investigation on mixing characteristics and mechanism of natural gas air in a super large bore dual fuel marine engine |
| topic | natural gas/air mixing large-bore dual-fuel engine low-speed swirl ratio computational fluid dynamics |
| url | https://www.mdpi.com/2073-4433/13/9/1528 |
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