Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine
Abstract The spark plug of an opposed‐piston two‐stroke (OP2S) gasoline engine is arranged on the side wall of the cylinder liner, far from the center of the combustion chamber; the ignition core of the mixture is offset, the flame propagation distance is increased, the combustion duration is prolon...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-12-01
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| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.1293 |
| _version_ | 1797980041490989056 |
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| author | Fukang Ma Jianwei Zhang Fang Wang |
| author_facet | Fukang Ma Jianwei Zhang Fang Wang |
| author_sort | Fukang Ma |
| collection | DOAJ |
| description | Abstract The spark plug of an opposed‐piston two‐stroke (OP2S) gasoline engine is arranged on the side wall of the cylinder liner, far from the center of the combustion chamber; the ignition core of the mixture is offset, the flame propagation distance is increased, the combustion duration is prolonged, and the knock tendency is severe. In this paper, a quasi‐dimensional two‐zone combustion model is used in GT‐Power software to establish a thermodynamic process simulation model and a knock prediction model is included to analyze the effect and matching of the compression ratio, ignition timing, and other thermodynamic process parameters on the knock intensity and engine performance. The extended coherent flame model combustion model is coupled with the Huh–Gosman spray model in AVL‐Fire software, and the An B knock model is used to establish an in‐cylinder combustion model and analyze the flame propagation and the knock response rate of the flat and pit piston during the combustion process. With an increase of the compression ratio, the temperature and pressure of the mixture in the combustion chamber increase at the time of ignition, which leads to the knocking combustion in the cylinder. With an increase of the ignition advance angle, the in‐cylinder pressure and temperature increase rapidly, which increases the likelihood of knocking combustion. In comparison with the pit piston combustion chamber, the flame propagation speed of the flat piston combustion chamber is relatively slow, which increases the knock tendency. The results show that lowering the compression ratio and delaying the ignition can reduce the in‐cylinder knock tendency by setting a compression ratio of 10.5 and an ignition advance angle of 20°CA. When the pit piston is used to organize the squish and inverse squish before and after the inner dead center, the flame propagation process can be promoted. The knock response rate of pit piston is 24.7% lower than that of flat top piston. |
| first_indexed | 2024-04-11T05:48:11Z |
| format | Article |
| id | doaj.art-b63be967c6da45339a6d7022fd05204a |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-04-11T05:48:11Z |
| publishDate | 2022-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-b63be967c6da45339a6d7022fd05204a2022-12-22T04:42:09ZengWileyEnergy Science & Engineering2050-05052022-12-0110124626463910.1002/ese3.1293Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engineFukang Ma0Jianwei Zhang1Fang Wang2School of Energy and Power Engineering North University of China Taiyuan ChinaPassenger Car Department SAIC Motor Corporation, Ltd Shanghai ChinaFuel Supply System Research Institute Shanxi Diesel Engine Industry Corporation, Ltd Datong ChinaAbstract The spark plug of an opposed‐piston two‐stroke (OP2S) gasoline engine is arranged on the side wall of the cylinder liner, far from the center of the combustion chamber; the ignition core of the mixture is offset, the flame propagation distance is increased, the combustion duration is prolonged, and the knock tendency is severe. In this paper, a quasi‐dimensional two‐zone combustion model is used in GT‐Power software to establish a thermodynamic process simulation model and a knock prediction model is included to analyze the effect and matching of the compression ratio, ignition timing, and other thermodynamic process parameters on the knock intensity and engine performance. The extended coherent flame model combustion model is coupled with the Huh–Gosman spray model in AVL‐Fire software, and the An B knock model is used to establish an in‐cylinder combustion model and analyze the flame propagation and the knock response rate of the flat and pit piston during the combustion process. With an increase of the compression ratio, the temperature and pressure of the mixture in the combustion chamber increase at the time of ignition, which leads to the knocking combustion in the cylinder. With an increase of the ignition advance angle, the in‐cylinder pressure and temperature increase rapidly, which increases the likelihood of knocking combustion. In comparison with the pit piston combustion chamber, the flame propagation speed of the flat piston combustion chamber is relatively slow, which increases the knock tendency. The results show that lowering the compression ratio and delaying the ignition can reduce the in‐cylinder knock tendency by setting a compression ratio of 10.5 and an ignition advance angle of 20°CA. When the pit piston is used to organize the squish and inverse squish before and after the inner dead center, the flame propagation process can be promoted. The knock response rate of pit piston is 24.7% lower than that of flat top piston.https://doi.org/10.1002/ese3.1293compression ratioignition timingknockopposed pistontwo‐stroke gasoline engine |
| spellingShingle | Fukang Ma Jianwei Zhang Fang Wang Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine Energy Science & Engineering compression ratio ignition timing knock opposed piston two‐stroke gasoline engine |
| title | Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine |
| title_full | Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine |
| title_fullStr | Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine |
| title_full_unstemmed | Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine |
| title_short | Knock combustion characteristics of an opposed‐piston two‐stroke gasoline engine |
| title_sort | knock combustion characteristics of an opposed piston two stroke gasoline engine |
| topic | compression ratio ignition timing knock opposed piston two‐stroke gasoline engine |
| url | https://doi.org/10.1002/ese3.1293 |
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