Theoretical Investigation on the Impact of Injection Parameters on the Combustion Process Based on an Opposed-Piston Diesel Engine

LIANG Yongsen, ZUO Zhengxing, WANG Wenxiao, LI Hong, LIU Long, WU Jie, WU Mindong, WANG Xinghao

Journal of Thermal Science ›› 2025, Vol. 34 ›› Issue (3) : 756-770.

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Journal of Thermal Science ›› 2025, Vol. 34 ›› Issue (3) : 756-770. DOI: 10.1007/s11630-025-2142-1

Theoretical Investigation on the Impact of Injection Parameters on the Combustion Process Based on an Opposed-Piston Diesel Engine

  • LIANG Yongsen1,3, ZUO Zhengxing1, WANG Wenxiao1, LI Hong3, LIU Long2, WU Jie2*,  WU Mindong2*, WANG Xinghao2
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Abstract

This study delves into the theoretical exploration of the effects of injector and orifice arrangement, spray angle, and orifice size on combustion and emission characteristics of horizontal opposed two-stroke engines. By employing numerical simulations, the research systematically investigates how variations in these parameters influence engine performance and emissions. The findings underscore the significance of injector and orifice configuration in optimizing fuel spatial mixing and atomization, resulting in improved indicated thermal efficiency and indicated mean effective pressure. However, it is noted that while emissions of HC, Soot, and CO can be maintained at low levels by injector and orifice configuration, NOx emissions tend to be relatively higher. Moreover, the study highlights the impact of spray angle on combustion dynamics, where an optimum spray angle is identified for achieving peak thermal efficiency and effective pressure due to the improvement between spray distribution and impingement. Additionally, the study reveals the critical role of nozzle diameter in combustion and emissions control, with an optimal diameter leading to enhanced thermal efficiency and reduced emissions of Soot, HC, CO, and CO2 to some extent. Overall, these findings offer valuable insights into optimizing engine performance and emissions control strategies in horizontal opposed two-stroke engines, guiding future research and development efforts in the field.

Key words

opposed-piston engines / injector arrangement / combustion / emissions

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LIANG Yongsen, ZUO Zhengxing, WANG Wenxiao, LI Hong, LIU Long, WU Jie, WU Mindong, WANG Xinghao. Theoretical Investigation on the Impact of Injection Parameters on the Combustion Process Based on an Opposed-Piston Diesel Engine[J]. Journal of Thermal Science, 2025, 34(3): 756-770 https://doi.org/10.1007/s11630-025-2142-1

References

[1] Reitz R.D., Ogawa H., Payri R., et al., IJER editorial: the future of the internal combustion engine. International Journal of Engine Research, 2020, 21: 3–10.
[2] Alagumalai A., Internal combustion engines: progress and prospects. Renewable and Sustainable Energy Reviews, 2014, 38: 561–571. 
[3] Leach F., Kalghatgi G., Stone R., et al., The scope for improving the efficiency and environmental impact of internal combustion engines. Transportation Engineering, 2020, 1: 100005. 
[4] Guo C., Zuo Z., Feng H., et al., Advances in free-piston internal combustion engines: A comprehensive review. Applied Thermal Engineering, 2021, 189: 116679. 
[5] Herold R., Wahl M., Regner G., et al., Thermodynamic benefits of opposed-piston two-stroke engines. SAE Technical Paper: 2011-01-2216, 2011. 
DOI: 10.4271/2011-01-2216
[6] Yuan C., Liu Y., Han C., et al., An investigation of mixture formation characteristics of a free-piston gasoline engine with direct-injection. Energy, 2019, 173: 626–636.
[7] Zhang Q., Xu Z., Liu S., et al., Effects of injector spray angle on performance of an opposed-piston free-piston engine. Energies, 2020, 13: 3735. 
[8] Guo C., Song Y., Feng H., et al., Effect of fuel injection characteristics on the performance of a free-piston diesel engine linear generator: CFD simulation and experimental results. Energy Conversion and Management, 2018, 160: 302–312.
[9] Zhang Z., Zhao C., Xie Z., et al., Study on the effect of the nozzle diameter and swirl ratio on the combustion process for an opposed-piston two-stroke diesel engine. Energy Procedia, 2014, 61: 542–546. 
[10] Zhang Z., Zhang P., Cross-impingement and combustion of sprays in high-pressure chamber and opposed-piston compression ignition engine. Applied Thermal Engineering, 2018, 144: 137–146. 
[11] Yang J., Huang Z., Li G., et al., Analysis of influences of injection parameters on combustion process based on 2-stroke rod-less opposed piston diesel engine. Applied Thermal Engineering, 2024, 236: 121637.
[12] Mattarelli E., Cantore G., Rinaldini C.A., et al., Combustion system development of an opposed piston 2-stroke diesel engine. Energy Procedia, 2017, 126: 1003–1010.
[13] Naik S., Johnson D., Koszewnik J., et al., Practical applications of opposed-piston engine technology to reduce fuel consumption and emissions. SAE Technical Paper: 2013-01-2754, 2013. DOI: 10.4271/2013-01-2754.
[14] Liu S., Xu Z., Chen L., et al., Comparison of an opposed-piston free-piston engine using single and dual channel uniflow scavenging. Applied Thermal Engineering, 2022, 201: 117813.
[15] Ma F., Yang W., Xu J., et al., Experimental investigation of combustion characteristics on opposed piston two-stroke gasoline direct injection engine. Energies, 2021, 14: 2105.
[16] Han Z., Reitz R., Turbulence modeling of internal combustion engines using RNG κ-ε models. Combustion Science and Technology, 1995, 106: 267–295.
[17] Senecal P.K., Pomraning E., Richards K.J., et al., Multi-dimensional modeling of direct-injection diesel spray liquid length and flame lift-off length using CFD and parallel detailed chemistry. SAE Technical Paper: 2003-01-1043, 2003. DOI: 10.4271/2003-01-1043.
[18] Reitz R.D., Beale J.C., Modeling spray atomization with the Kelvin-Helmholtz/Rayleigh-Taylor hybrid model. Atomization Spray, 1999, 9: 623–650.
[19] Schmidt D.P., Rutland C.J., A new droplet collision algorithm. Journal of Computational Physics, 2000, 164: 62–80.
[20] Som S., Development and validation of spray models for investigating diesel engine combustion and emissions. In: Mechanical Engineering, University of Illinois at Chicago, 2009.
[21] Heywood John B., Automotive engines and fuels: a review of future options. Progress in Energy and Combustion Science, 1981, 7(3): 155–184.
[22] Hiroyasu H., Kadota T., Models for combustion and formation of nitric oxide and soot in direct injection diesel engines. SAE Technical Paper: 760129, 1976. 
DOI: 10.4271/760129.
[23] Naber J., Siebers D., Effects of gas density and vaporization on penetration and dispersion of diesel sprays. SAE Technical Paper: 960034, 1996.
[24] Zhang K., Liang Z., Wang J., et al., Diesel diffusion flame simulation using reduced n-heptane oxidation mechanism. Applied Energy, 2013, 105: 223–228.
[25] Huang Z., Wang H., Luo K., et al., Direct numerical simulation of ammonia/n-heptane dual-fuel combustion under high pressure conditions. Fuel, 2024, 367: 131460.
[26] Li Y., Li H., Guo H., et al., A numerical study on the chemical kinetics process during auto-ignition of n-heptane in a direct injection compression ignition engine. Applied Energy, 2018, 212: 909–918.
[27] Liu L., Wu Y., Wang Y., et al., Comparison of the effect of diesel and hydrogen addition on ammonia combustion characteristics in a marine engine. SAE Technical Paper: 2023-32-0065, 2023.

Funding

The authors appreciate the financial support from Diesel Engine Development Project

RIGHTS & PERMISSIONS

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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