| Effect of Intake Port Parameters on the In-Cylinder Flow Characteristics in OP2S Diesel Engine |
| Yongsen Liang1,3, Zihan Liu2, Zhengxing Zuo1, Dayu Shi3, Yangyang Huo3, Lei Shi2 |
1School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China
2Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
3China North Engine Research Institute, Tianjin, 300400, China |
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Received: June 9, 2025; Revised: July 25, 2025 Accepted: July 29, 2025. Published online: October 6, 2025. |
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| ABSTRACT |
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To improve the thermal efficiency of opposed-piston two-stroke (OP2S) diesel engines, this study focuses on exploring the impact of intake port parameters on the in-cylinder flow field. By combining experimental testing with CFD method, the flow coefficient, swirl ratio, and in-cylinder flow characteristics of multiple intake port samples were analyzed. Based on these results, a preliminary optimization of the intake port design was conducted using the developed simulation model. Compared to the original configuration, the optimized intake port design maintained a high flow coefficient while significantly enhancing in-cylinder turbulent kinetic energy (TKE) and scavenging efficiency, thereby improving thermal efficiency. These findings provide scientific insights and technical support for optimizing the thermal efficiency of diesel engines. |
| Key Words:
OP2S · Diesel engine · Intake port optimization · Flow coefficient · Swirl ratio · CFD design |
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Corresponding Author.
Yongsen Liang , Email. 
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