Combined influence of ignition chamber volume and spark plug channel diameter on the performance of small-scale natural gas Wankel rotary engine
To improve the poor in-cylinder combustion condition of the small spark ignition Wankel rotary engine (SI-WRE) and improve its efficiency, this paper conducted a comprehensive optimization of its ignition environment. Since there are no known effects of ignition chamber characteristics, including ig...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Taylor & Francis Group
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/7365d6a158834adbab743e92bc2fdd35 |
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| Sumario: | To improve the poor in-cylinder combustion condition of the small spark ignition Wankel rotary engine (SI-WRE) and improve its efficiency, this paper conducted a comprehensive optimization of its ignition environment. Since there are no known effects of ignition chamber characteristics, including ignition chamber volume ( $ V_{ic} $ ) and spark plug channel diameter ( $ D_{spc} $ ), on the ignition environment, various combinations of $ V_{ic} $ and $ D_{spc} $ were established, simulated, and compared, using Computational Fluid Dynamics (CFD) methods with validated models. As there are small and complex structures in the small SI-WRE, along with the huge simulation load in the case study, special treatments were adopted in mesh division to maintain the fast and accurate simulation. The results showed a wide thermal efficiency range of 8.51–32.13% under various $ V_{ic} $ and $ D_{spc} $ combinations, indicating that the engine performance was deeply limited by the ignition chamber. $ V_{ic} $ and $ D_{spc} $ also had profound influences on short-term (affected by $ D_{spc} $ ) and long-term (affected by $ V_{ic} $ ) flow losses, fresh intake at spark region, combustion speed, and working stability. Stable working condition was achieved when $ V_{ic} = 1.5 $ cc and $ D_{spc} = 2 $ mm, while powerful situations were $ V_{ic} = 1.5 $ cc and $ D_{spc} = 8 $ mm, or $ V_{ic} = 0.5 $ cc and $ D_{spc} = 2 $ mm. |
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