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<p>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.</p>

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Effect of Intake Port Parameters on the In-Cylinder Flow Characteristics in OP2S Diesel Engine

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Yongsen Liang,
  • Zihan Liu,
  • Zhengxing Zuo,
  • Dayu Shi,
  • Yangyang Huo,
  • Lei Shi

摘要

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.