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Citation:
　Yelin Li,Jian Lan,Tian Lyu,et al.Enhancing External Combustion Efficiency in Stirling Engine Combustors: Influence of Oxygen Atmosphere, Ejection Ratio, and Pressure[J].Journal of Marine Science and Application,2025,(3):634-645.[doi:10.1007/s11804-024-00451-0]
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Enhancing External Combustion Efficiency in Stirling Engine Combustors: Influence of Oxygen Atmosphere, Ejection Ratio, and Pressure

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Title:
Enhancing External Combustion Efficiency in Stirling Engine Combustors: Influence of Oxygen Atmosphere, Ejection Ratio, and Pressure
Author(s):
Yelin Li1; 2;  Jian Lan2; 3;  Tian Lyu3;  Jiefei Zhou2;  Xin Yang3;  Gangtao Lin2;  Genxiang Gu3;  Dong Han1; 2
Affilations:
Author(s):
Yelin Li1; 2;  Jian Lan2; 3;  Tian Lyu3;  Jiefei Zhou2;  Xin Yang3;  Gangtao Lin2;  Genxiang Gu3;  Dong Han1; 2
1. China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, China;
2. Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China;
3. Shanghai Marine Diesel Engine Research Institute, Shanghai, 201108, China
Keywords:
Stirling engine combustor; Oxygen atmosphere; Ejection ratio; Pressure; External combustion efficiency
分类号:
-
DOI:
10.1007/s11804-024-00451-0
Abstract:
Knowing the optimal operating parameters of Stirling engines is important for efficient combustion through adaptability to changed pressures and oxygen atmospheres. In this study, the optimum operating conditions for efficient combustion in a singular Stirling engine combustor at different oxygen atmospheres were investigated and determined. Numerical simulations were performed to investigate the effects of ejection ratio and pressure on combustion performance. In an oxygen/carbon dioxide atmosphere, the results show that increasing the ejection ratio substantially alters the flame distribution in the Stirling engine combustor, increasing heat transfer and external combustion efficiency. In contrast, increasing the ejection ratio reduces the average and maximum temperatures of the Stirling engine combustor. Increased pressure affects the flame distribution in the Stirling engine combustor and impedes the flow and convective heat transfer in the combustor, reducing the overall external combustion efficiency at pressures above 6.5 MPa. In an air/carbon dioxide atmosphere, an increased ejection ratio reduces the average and maximum temperatures in the Stirling engine combustor. However, the overall flame distribution does not change substantially. The external combustion efficiency tends to increase and then decrease because of two opposing factors: the increase in the convective heat transfer coefficient and the decrease in the temperature difference. Increasing pressure inhibits forced convection heat transfer in the Stirling engine combustor, reducing external combustion efficiency, which drops from 78% to 65% when pressure increases from 0.2 MPa to 0.5 MPa.

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Memo

Memo:
Received date:2023-11-4;Accepted date:2023-12-28。
Foundation item:Supported by the Shanghai Rising Star Program (Grant No. 21QB1403900), and the Shanghai Municipal Commission of Science and Technology (Grant No. 22170712600).
Corresponding author:Yelin Li,E-mail:sjtulyl1998@sjtu.edu.cn
Last Update: 2025-05-28